{"id":6608,"date":"2026-07-17T15:52:02","date_gmt":"2026-07-17T15:52:02","guid":{"rendered":"https:\/\/europascal.de\/product\/additel-adt-901b\/"},"modified":"2026-09-30T10:21:30","modified_gmt":"2026-09-30T10:21:30","slug":"additel-adt-901b","status":"publish","type":"product","link":"https:\/\/europascal.de\/en\/product\/additel-adt-901b\/","title":{"rendered":"Additel ADT 901 Precise Low Pressure Test Pump"},"content":{"rendered":"<p><strong>Additel ADT 901<\/strong> is a precise low pressure test pump designed for generating stable pneumatic pressures from <strong>-0.4 bar to +0.4 bar (-6 psi to +6 psi)<\/strong>. With extremely fine pressure adjustment, excellent stability and a compact portable design, the ADT 901 provides an ideal pressure source for calibrating and testing low-pressure gauges, differential pressure instruments, transmitters and other sensitive pressure measuring devices.<\/p>\n<p>The Additel ADT 901 is completely hand operated and uses <strong>air as the pressure medium<\/strong>, eliminating the need for an external pressure supply or electrical power. A high-quality screw press enables exceptionally fine pressure adjustment, while the specially designed internal chamber helps reduce pressure fluctuations caused by environmental temperature changes.<\/p>\n<p>The pump provides two connections so that a reference instrument and the device under test can be connected simultaneously. Additel hand-tight quick connectors simplify installation and allow compatible instruments to be connected without tools.<\/p>\n<p>At <strong>europascal<\/strong>, the Additel ADT 901 complements a comprehensive range of pressure generation and calibration equipment for professional laboratory and field applications. For metrological traceability of pressure gauges, pressure calibrators and other measuring instruments, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<h2>Your Benefits at a Glance<\/h2>\n<p>The <strong>Additel ADT 901<\/strong> combines precise low-pressure generation with straightforward manual operation.<\/p>\n<p>Key benefits include:<\/p>\n<ul>\n<li>Pneumatic low-pressure test pump<\/li>\n<li>Pressure generation from -0.4 to +0.4 bar<\/li>\n<li>Vacuum and positive pressure generation<\/li>\n<li>Equivalent range of -6 to +6 psi<\/li>\n<li>Extremely fine pressure adjustment<\/li>\n<li>Adjustment resolution down to 0.1 Pa<\/li>\n<li>Air as pressure medium<\/li>\n<li>No external pressure supply required<\/li>\n<li>No electrical power required<\/li>\n<li>Excellent pressure stability<\/li>\n<li>Isothermal chamber design<\/li>\n<li>No conventional check valve<\/li>\n<li>Fine adjustment screw press<\/li>\n<li>Separate coarse and fine pressure adjustment<\/li>\n<li>Hand-tight quick connectors<\/li>\n<li>Simultaneous connection of reference and test instruments<\/li>\n<li>Multiple pressure connection options<\/li>\n<li>Compact portable design<\/li>\n<li>Weight approximately 1.6 kg<\/li>\n<li>Minimal maintenance<\/li>\n<li>Ideal for low and differential pressure calibration<\/li>\n<\/ul>\n<h2>Low Pressure Generation from -0.4 to +0.4 bar<\/h2>\n<p>The <strong>Additel ADT 901<\/strong> is specifically designed for low-pressure applications.<\/p>\n<p>Its generated pressure range extends from:<\/p>\n<p><strong>-0.4 bar vacuum to +0.4 bar pressure<\/strong><\/p>\n<p>or:<\/p>\n<p><strong>-6 psi to +6 psi<\/strong>.<\/p>\n<p>Unlike high-pressure hydraulic or pneumatic pumps, the ADT 901 is optimized for generating and precisely adjusting relatively small pressure differences.<\/p>\n<p>This makes it particularly suitable for sensitive measuring instruments where even small pressure changes are important.<\/p>\n<p>Typical devices under test include:<\/p>\n<ul>\n<li>Low-pressure gauges<\/li>\n<li>Differential pressure gauges<\/li>\n<li>Pressure transmitters<\/li>\n<li>Differential pressure transmitters<\/li>\n<li>Low-pressure sensors<\/li>\n<li>HVAC pressure instruments<\/li>\n<li>Filter monitoring instruments<\/li>\n<li>Laboratory pressure measuring devices<\/li>\n<\/ul>\n<h2>Extremely Fine Pressure Adjustment<\/h2>\n<p>One of the most important characteristics of the <strong>Additel ADT 901<\/strong> is its very fine pressure adjustment.<\/p>\n<p>The high-quality screw press provides an adjustment resolution down to approximately:<\/p>\n<p><strong>0.1 Pa<\/strong><\/p>\n<p>or:<\/p>\n<p><strong>0.001 mbar<\/strong>.<\/p>\n<p>This fine adjustment is particularly valuable when calibrating sensitive low-pressure devices.<\/p>\n<p>At low pressure, even a small mechanical movement can produce a relatively large change compared with the measurement range of the device under test.<\/p>\n<p>The fine adjustment mechanism of the ADT 901 allows the operator to approach individual calibration points carefully and accurately.<\/p>\n<h2>Coarse and Fine Pressure Adjustment<\/h2>\n<p>The Additel ADT 901 provides separate mechanisms for coarse and fine pressure generation.<\/p>\n<p>The main adjustment mechanism is used to approach the required pressure range.<\/p>\n<p>The fine adjustment screw is then used to precisely set the desired calibration point.<\/p>\n<p>This two-stage operating principle provides excellent control throughout the low-pressure range.<\/p>\n<p>The operator can generate both negative and positive pressure without requiring a separate vacuum pump or pressure source.<\/p>\n<p>This makes the ADT 901 particularly convenient for instruments with ranges extending below and above atmospheric pressure.<\/p>\n<h2>Excellent Pressure Stability<\/h2>\n<p>Generating pressure is only one part of a successful calibration.<\/p>\n<p>The generated pressure must also remain sufficiently stable while the reference instrument and device under test are compared.<\/p>\n<p>The <strong>Additel ADT 901<\/strong> has therefore been designed specifically to improve low-pressure stability.<\/p>\n<p>At very low pressures, temperature changes can cause noticeable pressure fluctuations.<\/p>\n<p>Even touching components of a conventional pressure system can introduce heat and temporarily change the generated pressure.<\/p>\n<p>The ADT 901 uses an internal design intended to minimize these effects and provide a stable pressure environment for calibration.<\/p>\n<h2>Isothermal Chamber Design<\/h2>\n<p>A key feature of the Additel ADT 901 is its <strong>isothermal chamber design<\/strong>.<\/p>\n<p>This construction helps reduce the influence of environmental temperature changes on the generated pressure.<\/p>\n<p>This is particularly important for low-pressure calibration because small temperature-related volume changes can cause significant pressure changes relative to the calibration point.<\/p>\n<p>The design therefore contributes to improved pressure stability after the desired pressure has been generated.<\/p>\n<p>For the best calibration results, the operator should nevertheless allow the pressure to stabilize before recording the reference and device-under-test readings.<\/p>\n<h2>No Conventional Check Valve<\/h2>\n<p>Many conventional hand pumps use a non-return or check valve as part of the pressure generation mechanism.<\/p>\n<p>The <strong>Additel ADT 901<\/strong> uses a different concept and does not rely on a conventional check valve for pressure generation.<\/p>\n<p>This contributes to the stable low-pressure behavior of the pump.<\/p>\n<p>For precision low-pressure work, reducing mechanical effects that can produce pressure fluctuations is an important advantage.<\/p>\n<p>Together with the isothermal chamber and precision screw press, this design makes the ADT 901 particularly suitable for sensitive low-pressure calibration.<\/p>\n<h2>Air as Pressure Medium<\/h2>\n<p>The Additel ADT 901 uses:<\/p>\n<p><strong>Air<\/strong><\/p>\n<p>as its pressure medium.<\/p>\n<p>This clean pneumatic operation is ideal for many low-pressure instruments.<\/p>\n<p>No hydraulic oil is required.<\/p>\n<p>This avoids the risk of contaminating pneumatic devices under test with oil and simplifies cleaning and maintenance compared with hydraulic pressure generation equipment.<\/p>\n<p>The pneumatic principle is particularly suitable for differential pressure instruments and other sensitive devices commonly used in HVAC, process measurement and laboratory applications.<\/p>\n<h2>Two Instrument Connections<\/h2>\n<p>A typical pressure calibration requires both:<\/p>\n<p><strong>a reference instrument<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>a device under test<\/strong>.<\/p>\n<p>The <strong>Additel ADT 901<\/strong> provides connections for both instruments.<\/p>\n<p>This allows the generated pressure to be applied simultaneously to the reference and the test instrument.<\/p>\n<p>A typical calibration setup therefore consists of:<\/p>\n<p><strong>Additel ADT 901 \u2192 Reference Pressure Gauge + Device Under Test<\/strong><\/p>\n<p>The pump generates the required pressure while the reference instrument provides the traceable pressure value.<\/p>\n<p>The indication of the device under test can then be compared directly with the reference.<\/p>\n<h2>Hand-Tight Quick Connectors<\/h2>\n<p>The Additel ADT 901 uses practical <strong>hand-tight quick connectors<\/strong>.<\/p>\n<p>These allow compatible pressure instruments to be connected and disconnected without requiring conventional wrenches for every instrument change.<\/p>\n<p>This is particularly useful in calibration laboratories where several devices may need to be tested consecutively.<\/p>\n<p>The connector concept can reduce setup time and simplify daily operation.<\/p>\n<p>Correct adapters and sealing components must always be selected for the corresponding connection type.<\/p>\n<h2>Multiple Pressure Connections<\/h2>\n<p>The <strong>Additel ADT 901<\/strong> is available with different pressure port configurations.<\/p>\n<p>Depending on the selected version, connection options include:<\/p>\n<ul>\n<li>1\/4 NPT female<\/li>\n<li>1\/2 NPT female<\/li>\n<li>1\/4 BSP female<\/li>\n<li>1\/2 BSP female<\/li>\n<li>M20 \u00d7 1.5 female<\/li>\n<\/ul>\n<p>This allows the pump to be adapted to different international pressure connection standards.<\/p>\n<p>Additional adapters can be used when the reference instrument or device under test has a different connection.<\/p>\n<h2>Calibration of Differential Pressure Instruments<\/h2>\n<p>The Additel ADT 901 is particularly useful for calibrating differential pressure measuring instruments.<\/p>\n<p>Typical applications include:<\/p>\n<ul>\n<li>Differential pressure gauges<\/li>\n<li>Differential pressure transmitters<\/li>\n<li>HVAC instruments<\/li>\n<li>Filter monitoring devices<\/li>\n<li>Flow-related differential pressure instruments<\/li>\n<li>Low-pressure sensors<\/li>\n<\/ul>\n<p>Combined with an appropriate differential pressure reference, the pump can generate the pressure required to compare the device under test with a traceable reference.<\/p>\n<p>Additel also documents calibration arrangements in which the ADT 901 is combined with a differential pressure reference and the corresponding pressure connections.<\/p>\n<h2>Pressure Gauge Calibration<\/h2>\n<p>The <strong>Additel ADT 901<\/strong> can also be used to calibrate low-pressure gauges.<\/p>\n<p>A reference pressure gauge and the device under test are connected to the pump.<\/p>\n<p>The operator then generates defined calibration pressures throughout the required measurement range.<\/p>\n<p>At each calibration point, the pressure is allowed to stabilize before the indications of the reference and test instrument are recorded.<\/p>\n<p>The fine adjustment mechanism helps the operator accurately approach the required calibration points.<\/p>\n<h2>Vacuum and Positive Pressure with One Pump<\/h2>\n<p>An important advantage of the ADT 901 is its ability to generate both:<\/p>\n<p><strong>vacuum<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>positive pressure<\/strong>.<\/p>\n<p>The range extends continuously from approximately:<\/p>\n<p><strong>-0.4 bar to +0.4 bar<\/strong>.<\/p>\n<p>This is particularly useful when testing compound pressure instruments.<\/p>\n<p>Instead of using separate vacuum and pressure generation equipment, one compact pump can cover both sides of atmospheric pressure.<\/p>\n<p>This simplifies the calibration setup and reduces the amount of equipment required.<\/p>\n<h2>Portable Design<\/h2>\n<p>The <strong>Additel ADT 901<\/strong> is designed for both laboratory and portable applications.<\/p>\n<p>The pump weighs approximately:<\/p>\n<p><strong>1.6 kg \/ 3.5 lb<\/strong>.<\/p>\n<p>Its dimensions are approximately:<\/p>\n<p><strong>145 mm high<\/strong><\/p>\n<p>with a base of approximately:<\/p>\n<p><strong>245 \u00d7 165 mm<\/strong>.<\/p>\n<p>The compact dimensions make the pump easy to transport while the stable base provides a practical working platform during pressure generation.<\/p>\n<p>No electrical supply or compressed-air source is required, making the ADT 901 particularly useful for mobile calibration work.<\/p>\n<h2>Minimal Maintenance<\/h2>\n<p>The simple pneumatic design of the Additel ADT 901 is intended to require minimal maintenance.<\/p>\n<p>Because air is used as the pressure medium, there is no hydraulic fluid that needs to be filled, replaced or cleaned from the system during normal operation.<\/p>\n<p>Additel also offers dedicated maintenance components and accessories for the pump.<\/p>\n<p>Correct operation, clean pressure connections and appropriate storage help maintain reliable performance over the lifetime of the instrument.<\/p>\n<h2>Safety Pressure<\/h2>\n<p>The normal operating range of the <strong>Additel ADT 901<\/strong> is:<\/p>\n<p><strong>-0.4 to +0.4 bar<\/strong>.<\/p>\n<p>The documented safety pressure is:<\/p>\n<p><strong>less than 60 psi \/ 4 bar<\/strong>.<\/p>\n<p>The safety pressure must not be confused with the normal pressure generation range.<\/p>\n<p>The ADT 901 is a dedicated <strong>low-pressure pump<\/strong> and should be used within its specified operating range.<\/p>\n<p>For higher pneumatic pressures, an appropriately rated Additel pressure pump should be selected.<\/p>\n<h2>Typical Applications<\/h2>\n<p>The Additel ADT 901 is particularly suitable for:<\/p>\n<ul>\n<li>Low-pressure calibration<\/li>\n<li>Differential pressure calibration<\/li>\n<li>Pressure gauge calibration<\/li>\n<li>Pressure transmitter calibration<\/li>\n<li>Differential pressure transmitter calibration<\/li>\n<li>Pressure sensor testing<\/li>\n<li>Vacuum and positive pressure testing<\/li>\n<li>HVAC measurement equipment<\/li>\n<li>Filter monitoring instruments<\/li>\n<li>Pneumatic laboratory applications<\/li>\n<li>Field calibration<\/li>\n<li>Calibration laboratories<\/li>\n<li>Maintenance and service<\/li>\n<li>Research and development<\/li>\n<\/ul>\n<h2>Technical Highlights<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>Additel ADT 901<\/th>\n<\/tr>\n<tr>\n<td>Device type<\/td>\n<td>Low pressure test pump<\/td>\n<\/tr>\n<tr>\n<td>Pressure medium<\/td>\n<td>Air<\/td>\n<\/tr>\n<tr>\n<td>Generated pressure<\/td>\n<td>-0.4 to +0.4 bar<\/td>\n<\/tr>\n<tr>\n<td>Pressure in psi<\/td>\n<td>-6 to +6 psi<\/td>\n<\/tr>\n<tr>\n<td>Fine adjustment<\/td>\n<td>Down to 0.1 Pa \/ 0.001 mbar<\/td>\n<\/tr>\n<tr>\n<td>Pressure generation<\/td>\n<td>Manual<\/td>\n<\/tr>\n<tr>\n<td>Vacuum generation<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Positive pressure<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>External pressure supply<\/td>\n<td>Not required<\/td>\n<\/tr>\n<tr>\n<td>Electrical power<\/td>\n<td>Not required<\/td>\n<\/tr>\n<tr>\n<td>Fine adjustment<\/td>\n<td>Precision screw press<\/td>\n<\/tr>\n<tr>\n<td>Stability design<\/td>\n<td>Isothermal chamber<\/td>\n<\/tr>\n<tr>\n<td>Connections<\/td>\n<td>Hand-tight quick connectors<\/td>\n<\/tr>\n<tr>\n<td>Port options<\/td>\n<td>NPT, BSP or M20 \u00d7 1.5<\/td>\n<\/tr>\n<tr>\n<td>Operating temperature<\/td>\n<td>0 to 50 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Relative humidity<\/td>\n<td>&lt;95% RH<\/td>\n<\/tr>\n<tr>\n<td>Safety pressure<\/td>\n<td>&lt;60 psi \/ 4 bar<\/td>\n<\/tr>\n<tr>\n<td>Approx. dimensions<\/td>\n<td>245 \u00d7 165 \u00d7 145 mm<\/td>\n<\/tr>\n<tr>\n<td>Approx. weight<\/td>\n<td>1.6 kg<\/td>\n<\/tr>\n<tr>\n<td>Maintenance<\/td>\n<td>Minimal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Additel ADT 901 Calibration Setup<\/h2>\n<p>A professional calibration setup with the <strong>Additel ADT 901<\/strong> typically consists of three main components:<\/p>\n<p><strong>Additel ADT 901 low pressure test pump<\/strong><\/p>\n<p><strong>Reference pressure instrument<\/strong><\/p>\n<p><strong>Device under test<\/strong><\/p>\n<p>The reference instrument and device under test are connected to the two pressure ports of the pump.<\/p>\n<p>The operator uses the main adjustment mechanism to approach the required pressure and the precision fine adjustment to set the exact calibration point.<\/p>\n<p>After allowing sufficient stabilization time, the indication of the device under test is compared with the reference value.<\/p>\n<p>Several increasing and decreasing pressure points can be generated depending on the required calibration procedure.<\/p>\n<p>This straightforward comparison principle makes the ADT 901 an excellent manual pressure source for professional low-pressure calibration.<\/p>\n<h2>Why Choose the Additel ADT 901?<\/h2>\n<p>The <strong>Additel ADT 901<\/strong> provides a simple and highly effective solution for generating stable low pneumatic pressures.<\/p>\n<p>Its pressure range from <strong>-0.4 to +0.4 bar<\/strong> covers both vacuum and positive pressure applications, making it particularly useful for compound and differential pressure instruments.<\/p>\n<p>The precision screw press provides adjustment down to approximately <strong>0.1 Pa<\/strong>, allowing very small pressure changes to be generated in a controlled manner.<\/p>\n<p>The isothermal chamber design helps minimize pressure changes caused by environmental temperature effects, while the absence of a conventional check valve contributes to stable low-pressure operation.<\/p>\n<p>Hand-tight quick connectors simplify connection of the reference and test instruments, and the availability of NPT, BSP and M20 \u00d7 1.5 connection options makes the pump suitable for different international pressure systems.<\/p>\n<p>At only approximately 1.6 kg, the pump is compact enough for mobile use while remaining stable on the laboratory bench.<\/p>\n<p>Because the ADT 901 operates manually with air, no electrical power, compressed-air supply or hydraulic fluid is required.<\/p>\n<p>At <strong>europascal<\/strong>, we provide Additel pressure generation and calibration equipment for professional laboratory, industrial and field applications. Our portfolio includes pneumatic and hydraulic pressure pumps, digital pressure gauges, pressure calibrators, reference instruments and automated pressure calibration solutions.<\/p>\n<p>For professional calibration and metrological traceability of your pressure measuring instruments, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<p><a href=\"https:\/\/europascal.de\/marke\/additel\/\">Further Additel products are available from europascal.<\/a><\/p>\n<p>Manufacturer information about the <strong>Additel ADT 901<\/strong> is available on the <a href=\"https:\/\/www.additel.com\/\" target=\"_blank\" rel=\"noopener\">official Additel website<\/a>.<\/p>\n<p><a class=\"download-datasheet\" href=\"#\" data-pdf=\"https:\/\/europascal.de\/wp-content\/uploads\/2026\/07\/Additel-ADT-901B-Low-Pressure-Test-Pumps-20231229.pdf\"><span style=\"color: #0000ff;\"><strong><em>Download Datasheet<\/em><\/strong><\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Additel ADT 901<\/strong> is a precise low pressure test pump for generating stable pneumatic pressures from <strong>-0.4 to +0.4 bar (-6 to +6 psi)<\/strong>. With fine adjustment down to <strong>0.1 Pa<\/strong>, an isothermal chamber design and practical hand-tight connectors, it is ideal for calibrating low-pressure and differential pressure instruments.<\/p>\n","protected":false},"featured_media":3251,"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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