Bump Test (Gas Challenge) With Remote Gassing Cell (Rgc) - Honeywell Searchpoint Optima Plus Operating Instructions Manual

MAN0905_Issue 7_07/17

7.5 Bump Test (Gas Challenge) with Remote Gassing Cell (RGC)

Using a test gas of 50 %v/v methane in the Remote Gassing cell (RGC), a gas response will be generated
from most Searchpoint Optima Plus units. The reading depends on the target gas calibration of the unit.
The RGC is a tool to check for a gas response and is not precise; therefore variability in response between
units should be expected.
Caution: Gas readings will be generated during this procedure. Take appropriate action at the control
and monitoring system to inhibit signals.
Caution: Maximum flow rate is 0.3 litres per minute to avoid pressurising the gas in the RGC.
Note: This procedure only applies if the Searchpoint Optima Plus has a Remote Gassing Cell (RGC) fitted.
The RGC is a factory fitted option.
Note: During testing the 4-20 mA output can be monitored either at the control room or locally with a
multimeter. When connecting or disconnecting a multimeter, power off the Searchpoint Optima Plus,
otherwise the unit will indicate a latched warning that the 4-20 mA loop was broken. If this occurs it can be
cleared by re-cycling the power.
High Concentration
(v/v cell) Nozzles
1. Inspect the gassing pipes to the RGC. Ensure that the exhaust is clear and vents well away from the
Searchpoint Optima Plus, and does not cause a hazard.
2. Apply 50 %v/v methane at a rate of 0.3 litres per minute for ~ 30 - 60 s. (For long gas pipes > ~10 m,
allow a longer time for the gas to reach Searchpoint Optima Plus).
3. Check that the Searchpoint Optima Plus responds to the test gas.
Note: If the gas reading is not acceptable for the application, re-zero the Searchpoint Optima Plus and
repeat the test. The SHC1 Handheld Interrogator, the HART
Transmitter is required to re-zero the Searchpoint Optima Plus.
4. Flush the RGC with zero gas until the gas reading has returned to zero.
7. Maintenance
Remote Gassing Cell
34
Searchpoint Optima Plus with optional HART
communication or the XNX Universal
®
output
®
Operating Instructions
2108M0550