Emerson Rosemount 625IR Manual page 28

Operation
January 2024
3.1.1 Perform a function check with the gas test kit
Use the gas test kit to quickly verify the functionality of the detector without having to
remove the environment shield, if fitted. The gas test kit has an opening in the front
between the gas nozzles that allows for the operator to see the indicator showing the
detector's status.
Prerequisites
• Gas test kit
Figure 3-1: Inserting gas test kit
• Gas cylinder with the same type of gas as the detector is rated to detect
—
—
• Flexible gas hose
Procedure
1. Connect the tube from the gas cylinder to one of the gas test kit nozzles (see
2. Slide the gas test kit on the outside of the detector sensor section as illustrated in
3. Apply the gas from the gas cylinder with at least 1 liter/minute flow rate.
4. Observe that the detector indicator is showing a gas alarm or that a gas response is
If the detector responds with more than 20% FS, it has passed the test.
3.1.2 Perform a function check using the gas nozzle
This procedure is used for gas testing detectors that are mounted in a hard to reach
location.
Prerequisites
The kit consists of a gas nozzle on the nose of the detector. In between the gas nozzle and
gas test box, there is a gas pipe to allow for the gas to flow from the gas test box and into
the detector through the gas nozzle.
• Gas nozzle (if not already fitted)
28
A. Gas test kit
B. Gas test kit nozzles
Concentration of test gas recommended to 50% ±10% full scale (FS)
Flow rate minimum of one liter/minute
3-1).
Figure 3-1.
received at the control system.
Manual
MS-00809-0100-3625
Figure
Emerson.com