Video Demo


• Portable, only 3.5 lb

• Great stability and high resolution

• Minimal maintenance

• Hand-tight quick connectors

The 901A Low Pressure Test Pump is a hand operated pressure pump designed to generate pressures from -6 psi (-0.4 bar) to 6 psi (0.4 bar). A high-quality screw press is designed for fine pressure adjustment, with an adjustment resolution up to 0.1 Pa (0.001 mbar). The 901A is a very stable low pressure calibrator. It makes use of an isothermal bellows chamber which is designed for reducing the possible effects of environmental temperature change. Most pumps make use of a check valve (non-returning valve) and are not well insulated which will cause large fluctuations in pressure with a change in ambient temperature or when the unit is touched. The 901 does not use a check valve and is remarkably stable. Two hand-tight connectors installed on the pump allow easy connecting and disconnecting to the test pump without the need for PTFE tape or wrenches. The 901A is an ideal comparison test pump for low pressure applications.

The Additel 901A is designed for low pressure application requiring accurate low pressure testing and calibration. It can be used in calibrating low pressure gauges, transmitters, or other pressure measuring instruments.

• Media: 

• Generated Pressure Range
  6 psi (0.4 bar) vacuum to 6 psi (0.4 bar) positive pressure.

• Adjustment Resolution:
  0.1 Pa (0.001 mbar).

• Material:
  Ram/adapters: SS
  Body: SS/aluminum
  Seals: Buna-N

• Connection
  Hand-tight connectors for both test gauge and reference gauge.
  Test Gauge Connection: 1/4NPT female, 1/4BSP female, or M20X1.5 female
  Reference Gauge Connection: 1/4NPT female, 1/4BSP female, or M20X1.5 female

• Dimensions: 
  Height: 5.7'' (145mm)
  Base: 9.65'' (245 mm) x 6.50'' (165mm)

• Weight: 
  3.5 lb (1.6 kg).

• Warranty: 
  1 year.

Update Packages:

File name Upload Date Size
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File nameUpload DateSize
Additel 901A Users Manual 2018.3.27 1.6 MB
Additel 901A Low Pressure Test Pump Datasheet 2018.3.27 0.1 MB



File name
Additel 901A Video Demo