Tetra Bump Test Accessory kit
The Bump Test Accessory is a gas testing kit designed to enable bump testing
of the Tetra multigas detector using a specially formulated, high stability long
life quad gas mix. It can be used with Tetra units having sensors for
Combustible, Oxygen, Carbon Monoxide and Hydrogen Sulphide gases, and all
Tetra units with these sensors can be bump tested using the kit.
6.1 Bump testing
Bump testing checks the sensor is responding within set limits to an applied gas
of known composition. This can be performed as often as desired, but would
usually be carried out each time the Tetra is issued for use. The Tetra itself will
determine Pass/Fail status for the bump test.
In order to perform successful bump tests ensure:
• The quad gas mixture used has the correct gas concentration, and that
it is within the validity date specified by the supplier.
• The gas flow path is leak tight. It is important to check that the flow
plate is properly fitted to the Tetra, and the outlet tubing is not restrict-
ed in any way, nor additional tubing length used.
The Bump Test Accessory Kit is supplied in a convenient carry case and com-
prises; a gas cylinder containing the quad gas mix, a 'Trigger' regulator with
interconnect tubing, a magnet - used to activate Test mode, an aspirator plate
to attach to the Tetra and a vent line. The Trigger regulator can be operated in
two ways: (1) squeeze and hold - allows gas flow as long as the lever is held in,
or (2) by lifting the lever - the flow is locked on. There are two versions of the
kit; one for pumped Tetra units and one for non-pumped Tetra units supplied
with an aspirator plate. Pumped Tetra units require the use of the plate with the
integral bellows assembly.
6.2 How to perform a gas test
1. Ensure your Tetra unit is switched on and in normal operation.
2. Clip the flow plate onto the front of the unit and attach the hose from
the Trigger regulator.
Attach the outlet hose to ‘vent gas away’ - do not extend this hose
and do not restrict or allow kinks.
3. Swipe the magnet passed the display adjacent to the LED lens. Your
Tetra unit will activate the Gas Test and show ‘BUMP TEST’ on the
display.
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Gas testing Tetra
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