MAN0905_Issue 7_07/17
Searchpoint Optima Plus with optional HART
®
output
Operating Instructions
2108M0550
34
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.
Remote Gassing Cell
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
®
communication or the XNX Universal
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
