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Additel 901A Low Pressure Test Pump


Air: -6 psi to 6 psi

The 901 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 901 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 901 is an ideal comparison test pump for low pressure applications..



• 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).


For complete specs please download the product datasheet


ADT901 - N ... SET

Note :

ADT901 - model

N - pressure port type

N = 1/4NPT female
N2 = 1/2NPT female
B = 1/4BSP female
B2 = 1/2BSP female
M = M20X1.5 female

SET - Pump and carrying case included

Accessories included

  • O-ring : 20 pcs
  • Manual - 1 pc
  • Carrying case (901A-X-SET models only)



Model Name Description Price
ADT901-X-kit Test kit for ADT901 (barb fitting, connection hoses and adapters)
X=connection type e.g. N-1/4NPTM, N2-1/2NPTM, B-1/4BSPM, B2-1/2BSPM, M-20X1.5M
Get a Quote >>
ADT102 Adapters and fittings, 1/4 NPT male to various male and female connection (25 pcs) Get a Quote >>
ADT103 Adapters and fittings, 1/4NPT (1/2NPT, 1/4BSP, 1/2BSP or M20X1.5) male to various female hand-tight connector Get a Quote >>
ADT100-HTK Hose test kit, 5 feet flexible hose, 15,000psi , 1/4NPT male to 1/4NPT (1/8NPT, 1/2NPT, 1/4BSP, 1/2BSP, or M20X1.5) female hand-tight connector Get a Quote >>
9901-901 Carrying case for one ADT901 pump and two ADT681 gauges or ADT672 calibrators Get a Quote >>
ADT901-MK Maintenance kit for Additel 901 pump Get a Quote >>
9240 Differential pressure gauge holder Get a Quote >>

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