{"id":6808,"date":"2026-07-17T16:57:02","date_gmt":"2026-07-17T16:57:02","guid":{"rendered":"https:\/\/europascal.de\/product\/fluke-calibration-5611a\/"},"modified":"2026-10-12T09:34:31","modified_gmt":"2026-10-12T09:34:31","slug":"fluke-calibration-5611a","status":"publish","type":"product","link":"https:\/\/europascal.de\/en\/product\/fluke-calibration-5611a\/","title":{"rendered":"Fluke Calibration 5611 Precise Reference Thermistor"},"content":{"rendered":"<p>The <strong>Fluke Calibration 5611<\/strong> is a high-precision, silicone-coated secondary reference thermistor designed for accurate temperature measurements in laboratories, industrial environments and demanding temperature calibration applications.<\/p>\n<p>With a temperature range from <strong>0 \u00b0C to +100 \u00b0C<\/strong>, a nominal resistance of <strong>10,000 \u03a9 at 25 \u00b0C<\/strong> and a calibrated accuracy of <strong>\u00b10.01 \u00b0C<\/strong>, the Fluke Calibration 5611 provides excellent measurement performance in a compact and flexible design.<\/p>\n<p>The most important feature of the Fluke Calibration 5611 is its exceptionally small sensing tip.<\/p>\n<p>With a tip diameter of only <strong>1.5 mm<\/strong>, the thermistor can measure temperatures in locations that are difficult or impossible to access with conventional metal-sheathed temperature probes.<\/p>\n<p>The flexible silicone coating makes the Fluke Calibration 5611 particularly suitable for applications requiring a small, lightweight and responsive temperature sensor.<\/p>\n<p>Unlike platinum resistance thermometers, the Fluke Calibration 5611 uses a negative temperature coefficient (NTC) thermistor.<\/p>\n<p>The electrical resistance decreases as temperature increases, providing excellent sensitivity to small temperature changes.<\/p>\n<p>The manufacturer specifies repeatability better than <strong>\u00b10.005 \u00b0C<\/strong> and annual drift better than <strong>\u00b10.01 \u00b0C<\/strong> under defined conditions.<\/p>\n<p>Each Fluke Calibration 5611 is supplied with individual resistance-temperature calibration data and an interpolation equation.<\/p>\n<p>A calibration traceable to NIST standards is included, while an accredited calibration can be ordered separately.<\/p>\n<p>When combined with a suitable precision thermometer readout, the Fluke Calibration 5611 provides an excellent solution for reference temperature measurements and temperature comparison calibration.<\/p>\n<p>At <strong>europascal<\/strong>, the Fluke Calibration 5611 offers a professional solution for precision temperature measurement, laboratory calibration and temperature monitoring applications.<\/p>\n<p>For professional calibration and metrological traceability, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<h2>Your Benefits at a Glance<\/h2>\n<ul>\n<li>High-precision secondary reference thermistor<\/li>\n<li>Temperature range from 0 \u00b0C to +100 \u00b0C<\/li>\n<li>Calibrated accuracy of \u00b10.01 \u00b0C<\/li>\n<li>Repeatability better than \u00b10.005 \u00b0C<\/li>\n<li>Annual drift better than \u00b10.01 \u00b0C<\/li>\n<li>Nominal resistance of 10 k\u03a9 at 25 \u00b0C<\/li>\n<li>Negative temperature coefficient (NTC)<\/li>\n<li>Extremely small 1.5 mm sensing tip<\/li>\n<li>Flexible silicone-coated construction<\/li>\n<li>Fast response to temperature changes<\/li>\n<li>Suitable for confined measurement locations<\/li>\n<li>Suitable for small measurement volumes<\/li>\n<li>Reduced immersion requirements compared with many PRT probes<\/li>\n<li>Suitable for temperature comparison calibration<\/li>\n<li>Individual resistance-temperature calibration table<\/li>\n<li>Calibration table with 0.1 \u00b0C increments<\/li>\n<li>Interpolation equation included<\/li>\n<li>NIST-traceable calibration included<\/li>\n<li>Optional accredited calibration<\/li>\n<li>Different connector configurations available<\/li>\n<li>Compatible with precision thermometer readouts<\/li>\n<li>Professional calibration support from europascal<\/li>\n<\/ul>\n<h2>Precision Temperature Measurement from 0 \u00b0C to 100 \u00b0C<\/h2>\n<p>The <strong>Fluke Calibration 5611<\/strong> provides accurate temperature measurements over a defined operating range.<\/p>\n<p><strong>Temperature range: 0 \u00b0C to +100 \u00b0C<\/strong><\/p>\n<p>This range covers many important laboratory and industrial applications.<\/p>\n<p>The Fluke Calibration 5611 is particularly suitable for measurements requiring high accuracy near ambient temperature.<\/p>\n<p>Its high temperature sensitivity makes it useful for detecting small temperature differences and fluctuations.<\/p>\n<p>Typical applications include laboratory temperature measurements, temperature comparison calibration, temperature stability monitoring and temperature measurements in confined spaces.<\/p>\n<p>The Fluke Calibration 5611 is designed for applications where a conventional rigid temperature probe may be too large.<\/p>\n<h2>Silicone-Coated Thermistor<\/h2>\n<p>The Fluke Calibration 5611 features a flexible silicone-coated construction.<\/p>\n<p>Unlike conventional metal-sheathed reference thermometers, the sensing element is protected by a flexible coating.<\/p>\n<p>This provides several advantages.<\/p>\n<p>The sensor can be positioned in confined spaces and locations that are difficult to access.<\/p>\n<p>Its small sensing tip also allows temperature measurements in relatively small measurement volumes.<\/p>\n<p>The silicone coating makes the probe particularly useful for applications requiring flexibility and fast thermal response.<\/p>\n<p>However, the material compatibility of the coating must be considered.<\/p>\n<p><strong>Applications involving silicone oil should be avoided because silicone oil may damage the thermistor.<\/strong><\/p>\n<p>For measurements requiring chemical resistance to a wide range of liquids, the PTFE-encapsulated Fluke Calibration 5611T may be more appropriate.<\/p>\n<h2>Extremely Small 1.5 mm Sensing Tip<\/h2>\n<p>One of the most important advantages of the Fluke Calibration 5611 is its small sensing tip.<\/p>\n<p><strong>Tip diameter: 1.5 mm<\/strong><\/p>\n<p><strong>Tip length: 25.4 mm<\/strong><\/p>\n<p>The compact dimensions allow the sensor to be positioned in narrow spaces.<\/p>\n<p>The small sensing element also provides a relatively low thermal mass.<\/p>\n<p>This helps the sensor respond quickly to changes in temperature.<\/p>\n<p>The compact design is particularly useful when measuring temperatures in small laboratory equipment or restricted measurement locations.<\/p>\n<h2>Fast Temperature Response<\/h2>\n<p>The Fluke Calibration 5611 is designed for applications requiring a fast response to temperature changes.<\/p>\n<p>The small sensing element and flexible construction help reduce the thermal mass of the probe.<\/p>\n<p>As a result, the thermistor can respond more quickly than many larger metal-sheathed temperature sensors under comparable conditions.<\/p>\n<p>Fast response is useful when monitoring changing temperature conditions.<\/p>\n<p>However, the actual response time depends on the measurement medium, installation and thermal contact.<\/p>\n<p>For high-accuracy calibration, sufficient time must be allowed for thermal equilibrium.<\/p>\n<h2>NTC Thermistor Technology<\/h2>\n<p>The Fluke Calibration 5611 uses an NTC thermistor.<\/p>\n<p>NTC stands for:<\/p>\n<p><strong>Negative Temperature Coefficient<\/strong><\/p>\n<p>The electrical resistance of the sensing element decreases as temperature increases.<\/p>\n<p>This differs from platinum resistance thermometers, which have a positive temperature coefficient.<\/p>\n<p>The Fluke Calibration 5611 has a nominal resistance of:<\/p>\n<p><strong>10,000 \u03a9 at 25 \u00b0C<\/strong><\/p>\n<p>The relatively high resistance and strong temperature dependence provide excellent sensitivity.<\/p>\n<p>This makes NTC thermistors particularly suitable for accurate temperature measurements over a limited temperature range.<\/p>\n<h2>High Calibrated Accuracy<\/h2>\n<p>The Fluke Calibration 5611 provides excellent calibrated accuracy.<\/p>\n<p>The manufacturer specifies:<\/p>\n<p><strong>\u00b10.01 \u00b0C<\/strong><\/p>\n<p>This specification applies to the supplied resistance-temperature calibration table and interpolation equation.<\/p>\n<p>The actual uncertainty of a complete temperature measurement system depends on additional factors.<\/p>\n<p>These include the connected thermometer readout, measurement conditions, sensor stability and calibration uncertainty.<\/p>\n<p>For professional calibration, all relevant uncertainty contributions must be considered.<\/p>\n<h2>Excellent Repeatability<\/h2>\n<p>Repeatability is an important characteristic of reference temperature sensors.<\/p>\n<p>The Fluke Calibration 5611 provides excellent repeatability under defined measurement conditions.<\/p>\n<p>The manufacturer specifies:<\/p>\n<p><strong>Better than \u00b10.005 \u00b0C<\/strong><\/p>\n<p>This characteristic is particularly useful for temperature comparison measurements.<\/p>\n<p>It allows small temperature differences to be evaluated with high reproducibility.<\/p>\n<h2>Low Annual Drift<\/h2>\n<p>Long-term stability is essential for reliable reference temperature measurements.<\/p>\n<p>The Fluke Calibration 5611 is designed to maintain stable resistance-temperature characteristics.<\/p>\n<p>The manufacturer specifies annual drift of:<\/p>\n<p><strong>Better than \u00b10.01 \u00b0C per year<\/strong><\/p>\n<p>This specification is stated with a coverage factor of:<\/p>\n<p><strong>k = 3<\/strong><\/p>\n<p>Regular calibration is recommended to monitor changes in the resistance-temperature characteristic over time.<\/p>\n<h2>Individual Resistance-Temperature Calibration<\/h2>\n<p>Each Fluke Calibration 5611 is supplied with individual calibration data.<\/p>\n<p>The manufacturer provides a resistance-versus-temperature table.<\/p>\n<p>The calibration table contains values in increments of:<\/p>\n<p><strong>0.1 \u00b0C<\/strong><\/p>\n<p>An interpolation equation is also supplied.<\/p>\n<p>This allows resistance values between the tabulated calibration points to be converted into temperature.<\/p>\n<p>The manufacturer describes interpolation to a resolution of:<\/p>\n<p><strong>0.0001 \u00b0C<\/strong><\/p>\n<p>This interpolation resolution must not be confused with the calibrated accuracy of \u00b10.01 \u00b0C.<\/p>\n<h2>Thermistor Temperature Conversion<\/h2>\n<p>The relationship between resistance and temperature in an NTC thermistor is nonlinear.<\/p>\n<p>A commonly used mathematical representation is the Steinhart-Hart equation:<\/p>\n<p><strong>1\/T = A + B \u00d7 ln(R) + C \u00d7 [ln(R)]\u00b3<\/strong><\/p>\n<p>Where:<\/p>\n<ul>\n<li>T = Absolute temperature in kelvin<\/li>\n<li>R = Thermistor resistance<\/li>\n<li>A, B and C = Calibration coefficients<\/li>\n<\/ul>\n<p>The exact temperature conversion depends on the individual calibration data and the capabilities of the connected thermometer readout.<\/p>\n<p>For accurate measurements, the calibration equation supplied with the probe should be used.<\/p>\n<h2>NIST-Traceable Calibration Included<\/h2>\n<p>The Fluke Calibration 5611 is supplied with calibration data traceable to NIST standards.<\/p>\n<p>The calibration documentation provides the individual resistance-temperature relationship of the thermistor.<\/p>\n<p>This supports accurate temperature calculation.<\/p>\n<p>The included traceable calibration is not necessarily equivalent to an accredited calibration certificate.<\/p>\n<p>An accredited calibration can be ordered separately.<\/p>\n<h2>Optional Accredited Calibration<\/h2>\n<p>Fluke Calibration offers optional NVLAP-accredited calibration for the 5611.<\/p>\n<p>The manufacturer specifies optional accredited calibration uncertainties down to:<\/p>\n<p><strong>\u00b10.006 \u00b0C<\/strong><\/p>\n<p>The applicable uncertainty depends on the selected calibration service and calibration conditions.<\/p>\n<p>For demanding metrological applications, the calibration certificate should be reviewed to determine the relevant measurement uncertainty.<\/p>\n<h2>Compatible Thermometer Readouts<\/h2>\n<p>The Fluke Calibration 5611 is a passive temperature sensor.<\/p>\n<p>It does not include an integrated temperature display.<\/p>\n<p>A compatible precision thermometer readout is required.<\/p>\n<p>Suitable Fluke Calibration instruments include:<\/p>\n<ul>\n<li>Fluke Calibration 1504<\/li>\n<li>Fluke Calibration 1523<\/li>\n<li>Fluke Calibration 1524<\/li>\n<li>Fluke Calibration 1529<\/li>\n<li>Fluke Calibration 1560<\/li>\n<li>Fluke Calibration 1575A<\/li>\n<li>Fluke Calibration 1590<\/li>\n<\/ul>\n<p>The appropriate connector configuration must be selected.<\/p>\n<h2>Fluke Calibration 5611 with Fluke Calibration 1504<\/h2>\n<p>The Fluke Calibration 1504 is a precision thermistor thermometer readout.<\/p>\n<p>When combined with the Fluke Calibration 5611, it provides a compact temperature measurement system.<\/p>\n<p>The readout measures the resistance of the thermistor and converts it into temperature using suitable calibration coefficients.<\/p>\n<p>This combination is useful for laboratory temperature measurements and calibration applications.<\/p>\n<h2>Fluke Calibration 5611 with Fluke Calibration 1523<\/h2>\n<p>The Fluke Calibration 1523 is a portable reference thermometer readout.<\/p>\n<p>It supports precision thermistors and other temperature sensor technologies.<\/p>\n<p>Combined with the Fluke Calibration 5611, it provides a portable solution for accurate temperature measurements.<\/p>\n<p>The flexible probe construction is particularly useful when measuring temperatures in confined spaces.<\/p>\n<h2>Fluke Calibration 5611 with Fluke Calibration 1524<\/h2>\n<p>The Fluke Calibration 1524 is a dual-channel reference thermometer readout.<\/p>\n<p>It allows simultaneous measurements using two compatible temperature sensors.<\/p>\n<p>The instrument also provides integrated data logging.<\/p>\n<p>When combined with the Fluke Calibration 5611, it can be used for temperature comparison measurements and temperature stability monitoring.<\/p>\n<h2>Available Connector Configurations<\/h2>\n<p>The Fluke Calibration 5611 is available with different connector options.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Connector Code<\/th>\n<th>Connection Type<\/th>\n<\/tr>\n<tr>\n<td>A<\/td>\n<td>INFO-CON for Fluke 914X<\/td>\n<\/tr>\n<tr>\n<td>B<\/td>\n<td>Bare wire<\/td>\n<\/tr>\n<tr>\n<td>D<\/td>\n<td>5-pin DIN<\/td>\n<\/tr>\n<tr>\n<td>G<\/td>\n<td>Gold pins<\/td>\n<\/tr>\n<tr>\n<td>J<\/td>\n<td>Banana plugs<\/td>\n<\/tr>\n<tr>\n<td>L<\/td>\n<td>Mini spade lugs<\/td>\n<\/tr>\n<tr>\n<td>M<\/td>\n<td>Mini banana plugs<\/td>\n<\/tr>\n<tr>\n<td>P<\/td>\n<td>INFO-CON for Fluke 1523\/1524<\/td>\n<\/tr>\n<tr>\n<td>S<\/td>\n<td>Spade lugs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The connector must be selected according to the thermometer readout.<\/p>\n<h2>Fluke Calibration 5611A-11X<\/h2>\n<p>The manufacturer lists the silicone-coated version as:<\/p>\n<p><strong>Fluke Calibration 5611A-11X<\/strong><\/p>\n<p>The model features:<\/p>\n<p><strong>Tip diameter: 1.5 mm<\/strong><\/p>\n<p><strong>Tip length: 25.4 mm<\/strong><\/p>\n<p><strong>Temperature range: 0 \u00b0C to +100 \u00b0C<\/strong><\/p>\n<p><strong>Lead-wire length: 1.83 m (6 ft)<\/strong><\/p>\n<p>The letter X identifies the selected connector configuration.<\/p>\n<p>For example, a suitable INFO-CON version can be selected for compatible Fluke Calibration thermometer readouts.<\/p>\n<h2>Temperature Comparison Calibration<\/h2>\n<p>The Fluke Calibration 5611 is suitable for temperature comparison calibration.<\/p>\n<p>A calibrated reference thermistor and the device under test are placed in a stable temperature environment.<\/p>\n<p>After thermal equilibrium has been reached, the temperature indications are recorded.<\/p>\n<p>The indication error is calculated as:<\/p>\n<p><strong>\u0394T = T_DUT \u2212 T_REF<\/strong><\/p>\n<p>Where:<\/p>\n<ul>\n<li>\u0394T = Temperature indication error<\/li>\n<li>T_DUT = Temperature indicated by the device under test<\/li>\n<li>T_REF = Reference temperature<\/li>\n<\/ul>\n<p>The measurement uncertainty depends on the calibration of the reference thermistor, thermometer readout and measurement conditions.<\/p>\n<h2>Temperature Measurements in Confined Spaces<\/h2>\n<p>The Fluke Calibration 5611 is particularly suitable for measurements in locations where conventional reference thermometers cannot be installed.<\/p>\n<p>Its flexible silicone-coated construction allows the probe to be positioned in narrow openings and small measurement spaces.<\/p>\n<p>The small sensing tip can also reduce the thermal disturbance caused by the measurement probe.<\/p>\n<p>This is useful when measuring temperatures in small laboratory equipment.<\/p>\n<p>The probe must nevertheless be positioned correctly to ensure adequate thermal contact.<\/p>\n<h2>Temperature Stability Measurements<\/h2>\n<p>The Fluke Calibration 5611 can be used to monitor temperature fluctuations over time.<\/p>\n<p>When connected to a suitable thermometer readout or data acquisition system, the sensor provides accurate resistance measurements.<\/p>\n<p>These measurements can be converted into temperature and recorded.<\/p>\n<p>The resulting data can be used to evaluate temperature stability.<\/p>\n<p>Typical applications include:<\/p>\n<ul>\n<li>Laboratory temperature monitoring<\/li>\n<li>Temperature-controlled equipment<\/li>\n<li>Temperature stability testing<\/li>\n<li>Temperature comparison measurements<\/li>\n<li>Research applications<\/li>\n<\/ul>\n<h2>Measurement in Air<\/h2>\n<p>The Fluke Calibration 5611 is particularly useful for temperature measurements in air.<\/p>\n<p>Its small sensing element and low thermal mass support a fast response.<\/p>\n<p>The manufacturer also highlights the low self-heating characteristics of its secondary reference thermistors.<\/p>\n<p>However, self-heating depends on the measurement current and thermal conditions.<\/p>\n<p>For high-accuracy air temperature measurements, the excitation current and airflow conditions should be considered.<\/p>\n<h2>Technical Highlights<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>Fluke Calibration 5611<\/th>\n<\/tr>\n<tr>\n<td>Product type<\/td>\n<td>Secondary Reference Thermistor<\/td>\n<\/tr>\n<tr>\n<td>Manufacturer<\/td>\n<td>Fluke Calibration<\/td>\n<\/tr>\n<tr>\n<td>Current model designation<\/td>\n<td>5611A-11X<\/td>\n<\/tr>\n<tr>\n<td>Sensor technology<\/td>\n<td>NTC Thermistor<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td>0 \u00b0C to +100 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Nominal resistance<\/td>\n<td>10,000 \u03a9 at 25 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Calibrated accuracy<\/td>\n<td>\u00b10.01 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Repeatability<\/td>\n<td>Better than \u00b10.005 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Annual drift<\/td>\n<td>Better than \u00b10.01 \u00b0C per year, k = 3<\/td>\n<\/tr>\n<tr>\n<td>Optional accredited calibration uncertainty<\/td>\n<td>Down to \u00b10.006 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Sensing tip diameter<\/td>\n<td>1.5 mm<\/td>\n<\/tr>\n<tr>\n<td>Sensing tip length<\/td>\n<td>25.4 mm<\/td>\n<\/tr>\n<tr>\n<td>Probe construction<\/td>\n<td>Flexible, silicone-coated<\/td>\n<\/tr>\n<tr>\n<td>Lead-wire length<\/td>\n<td>1.83 m<\/td>\n<\/tr>\n<tr>\n<td>Calibration table<\/td>\n<td>Resistance vs. temperature<\/td>\n<\/tr>\n<tr>\n<td>Calibration table increments<\/td>\n<td>0.1 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Interpolation equation<\/td>\n<td>Included<\/td>\n<\/tr>\n<tr>\n<td>Interpolation resolution<\/td>\n<td>0.0001 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>NIST-traceable calibration<\/td>\n<td>Included<\/td>\n<\/tr>\n<tr>\n<td>Accredited calibration<\/td>\n<td>Optional<\/td>\n<\/tr>\n<tr>\n<td>Integrated display<\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<td>Connector<\/td>\n<td>Selected when ordering<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Fluke Calibration 5610 vs. Fluke Calibration 5611<\/h2>\n<p>The Fluke Calibration 5610 and 5611 are both precision secondary reference thermistors.<\/p>\n<p>However, their construction differs significantly.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>Fluke Calibration 5610<\/th>\n<th>Fluke Calibration 5611<\/th>\n<\/tr>\n<tr>\n<td>Sensor technology<\/td>\n<td>NTC Thermistor<\/td>\n<td>NTC Thermistor<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td>0 \u00b0C to 100 \u00b0C<\/td>\n<td>0 \u00b0C to 100 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Nominal resistance<\/td>\n<td>10 k\u03a9<\/td>\n<td>10 k\u03a9<\/td>\n<\/tr>\n<tr>\n<td>Calibrated accuracy<\/td>\n<td>\u00b10.01 \u00b0C<\/td>\n<td>\u00b10.01 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Probe construction<\/td>\n<td>Stainless steel sheath<\/td>\n<td>Silicone-coated flexible probe<\/td>\n<\/tr>\n<tr>\n<td>Probe diameter<\/td>\n<td>3.2 mm<\/td>\n<td>1.5 mm at tip<\/td>\n<\/tr>\n<tr>\n<td>Main advantage<\/td>\n<td>Robust immersion probe<\/td>\n<td>Small flexible sensing tip<\/td>\n<\/tr>\n<tr>\n<td>Typical application<\/td>\n<td>Calibration baths<\/td>\n<td>Confined measurement locations<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The Fluke Calibration 5610 is particularly suitable for conventional immersion measurements.<\/p>\n<p>The Fluke Calibration 5611 is ideal for applications requiring a small and flexible sensing element.<\/p>\n<h2>Fluke Calibration 5611 vs. Fluke Calibration 5611T<\/h2>\n<p>The Fluke Calibration 5611 and 5611T use similar thermistor technology but feature different protective coatings.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>Fluke Calibration 5611<\/th>\n<th>Fluke Calibration 5611T<\/th>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td>0 \u00b0C to 100 \u00b0C<\/td>\n<td>0 \u00b0C to 100 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Nominal resistance<\/td>\n<td>10 k\u03a9<\/td>\n<td>10 k\u03a9<\/td>\n<\/tr>\n<tr>\n<td>Coating<\/td>\n<td>Silicone<\/td>\n<td>PTFE<\/td>\n<\/tr>\n<tr>\n<td>Tip diameter<\/td>\n<td>1.5 mm<\/td>\n<td>Approx. 3.2 mm<\/td>\n<\/tr>\n<tr>\n<td>Flexible construction<\/td>\n<td>Yes<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Lead-wire length<\/td>\n<td>1.83 m<\/td>\n<td>Approx. 6.1 m<\/td>\n<\/tr>\n<tr>\n<td>Main advantage<\/td>\n<td>Small sensing tip<\/td>\n<td>Moisture-resistant PTFE encapsulation<\/td>\n<\/tr>\n<tr>\n<td>Silicone oil compatibility<\/td>\n<td>Not recommended<\/td>\n<td>Check chemical compatibility<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The Fluke Calibration 5611 is particularly useful where a small sensing tip is required.<\/p>\n<p>The Fluke Calibration 5611T is designed for applications requiring a PTFE-encapsulated probe.<\/p>\n<h2>Typical Applications<\/h2>\n<p>The <strong>Fluke Calibration 5611<\/strong> is suitable for:<\/p>\n<ul>\n<li>Precision temperature measurement<\/li>\n<li>Secondary reference temperature measurement<\/li>\n<li>Thermistor calibration<\/li>\n<li>Temperature comparison calibration<\/li>\n<li>Laboratory temperature monitoring<\/li>\n<li>Temperature measurements in confined spaces<\/li>\n<li>Small-volume temperature measurements<\/li>\n<li>Temperature stability measurements<\/li>\n<li>Temperature-controlled equipment<\/li>\n<li>Air temperature measurement<\/li>\n<li>Research laboratories<\/li>\n<li>Quality assurance<\/li>\n<li>Temperature metrology<\/li>\n<li>Laboratory temperature calibration<\/li>\n<\/ul>\n<h2>Calibration by europascal<\/h2>\n<p>Regular calibration is essential for maintaining reliable temperature measurement results.<\/p>\n<p>europascal provides professional calibration services for temperature measuring instruments and reference temperature measurement systems.<\/p>\n<p>The Fluke Calibration 5611 can be calibrated to verify its individual resistance-temperature characteristic.<\/p>\n<p>When combined with a suitable precision thermometer readout, the thermistor forms part of a traceable temperature measurement system.<\/p>\n<p>The measurement uncertainty depends on the thermistor calibration, thermometer readout and measurement conditions.<\/p>\n<p>For professional calibration and metrological traceability, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<p>europascal also supports customers in selecting suitable reference thermistors, thermometer readouts and temperature calibration equipment.<\/p>\n<h2>Why Choose the Fluke Calibration 5611?<\/h2>\n<p>The <strong>Fluke Calibration 5611<\/strong> combines excellent measurement accuracy, fast thermal response and flexible construction in one compact secondary reference thermistor.<\/p>\n<p>Its temperature range from 0 \u00b0C to 100 \u00b0C covers many important laboratory and industrial applications.<\/p>\n<p>The exceptionally small 1.5 mm sensing tip allows measurements in confined spaces.<\/p>\n<p>The silicone-coated construction provides flexibility and allows the sensor to be positioned where conventional metal-sheathed probes may be unsuitable.<\/p>\n<p>The manufacturer specifies calibrated accuracy of \u00b10.01 \u00b0C, repeatability better than \u00b10.005 \u00b0C and annual drift better than \u00b10.01 \u00b0C.<\/p>\n<p>Individual resistance-temperature calibration data and an interpolation equation are included.<\/p>\n<p>Optional accredited calibration supports demanding metrological applications.<\/p>\n<p>Compatibility with suitable Fluke Calibration thermometer readouts provides flexibility for laboratory and portable measurement systems.<\/p>\n<p>For professional users requiring a compact, flexible and highly accurate reference thermistor, the Fluke Calibration 5611 provides an excellent combination of performance, sensitivity and versatility.<\/p>\n<p>europascal supports customers with reference temperature probes, temperature calibration equipment and professional calibration services.<\/p>\n<p><a href=\"https:\/\/europascal.de\/marke\/fluke-calibration\/\">Further products from Fluke Calibration can be found here.<\/a><\/p>\n<p><a href=\"https:\/\/www.fluke.com\/en-my\/product\/accessories\/temperature\/5610-5611-5611t-5665\" target=\"_blank\" rel=\"noopener\">Manufacturer information about the Fluke Calibration 5611 can be found on the official Fluke website.<\/a><\/p>\n<p><a class=\"download-datasheet\" href=\"#\" data-pdf=\"https:\/\/europascal.de\/wp-content\/uploads\/2026\/07\/Fluke-Hart-5610-5611A-5611T-Secondary-Referenz-Thermistor-Probes.pdf\"> <span style=\"color: #0000ff;\"><strong><em>Download Datasheet<\/em><\/strong><\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Fluke Calibration 5611<\/strong> is a high-precision, silicone-coated secondary reference NTC thermistor designed for accurate temperature measurements from <strong>0 \u00b0C to +100 \u00b0C<\/strong>. Featuring an exceptionally small <strong>1.5 mm sensing tip<\/strong>, flexible construction and a nominal resistance of <strong>10 k\u03a9 at 25 \u00b0C<\/strong>, the probe is ideal for measurements in confined spaces and small measurement volumes. With calibrated accuracy of <strong>\u00b10.01 \u00b0C<\/strong>, repeatability better than <strong>\u00b10.005 \u00b0C<\/strong> and excellent long-term stability, the Fluke Calibration 5611 provides reliable performance for laboratory temperature calibration. Individual calibration data are included, and accredited calibration is available as an option.<\/p>\n","protected":false},"featured_media":6809,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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