Additel's Low Pressure Tesp Pumps are hand operated pressure pumps with a high quality screw press that is designed for fine pressure adjustment, with an adjustment resolution up to 0.01 Pa (0.0001 mbar).
The Additel ADT901 and ADT912 are very stable low pressure calibrators that make use of an isothermal bellows chamber which is designed for reducing the possible effects of environmental temperature change. Most other pumps make use fo a check valve (non-returning valve) and are not well insulating in wild fluctuations in pressure with a change in ambient temperature or when the unit is touched. The ADT901 and ADT912 do not use a check valve and are remarkable stable. Two hand-tight connectors installed on the pumps allow for easy connecting and disconnecting to the test pump without the need for PTFE tape or wrenches.
The Additel ADT901 and ADT912 pumps are ideal comparison test pumps for low pressure application featuring: