Appendix 1 - Shc1 Additional Functions; Changing The Target Gas - Honeywell Searchpoint Optima Plus Operating Instructions Manual

MAN0905_Issue 7_07/17
SHC1 Additional Functions

19.1 Changing the Target Gas

Searchpoint Optima Plus is supplied with look-up tables for several different gases. If required, the gas
table can be changed to a different target gas.
If a new gas table is selected, the Searchpoint Optima Plus MUST be re-calibrated using the
Searchpoint Optima Plus stores a number of gas tables up to a maximum of 10. These include the Standard
Gases (Methane, Ethane, Propane, Butane for Hydrocarbon units, Ethylene for Ethylene units) plus any
Special Gases that have been specified when the unit was ordered. (For a full list of gases available to order
please see Specification).
Caution: Searchpoint Optima Plus units contain a gas table called Linear 20R which is a factory
setting. DO NOT select this gas table.
1. Select Gas Tables then Show Library to view the gas tables available for the unit.
2. Press Escape.
3. Select Select Gas.
4. Scroll through the available options to find the gas required.
5. Press Enter.
6. Display will read "Gas Selection OK"
7. Press Enter to release the 4-20mA output
8. Press Escape to return to the main menu.
9. Using a ½ inch / 13 mm A/F open ended spanner, unscrew the two retaining nuts and remove the
Standard Weather Protection.
10. Fit a Calibration Cap to the Searchpoint Optima Plus. Ensure it is pushed on fully.
11. Select Calibrate then CalSensor. (This will inhibit the 4-20 mA output signal).
12. Ensure that there is zero gas present in the vicinity of the Searchpoint Optima Plus. If necessary,
apply zero gas at a rate of 1 – 1.5 litres per minute.
13. Press Enter.
When the process is complete the display will state Zero Calibrated. It will then show options to continue
to a span calibration, or to exit calibration.
14. Press Enter to begin span calibration.
15. Press Enter.
16. Use and to set the concentration of the calibration gas. When it is correct, press Enter.
17. Apply test gas at a rate of 1 – 1.5 litres per minute. Wait for the gas reading to stabilise (~ 30 - 60 s).
18. Press Enter.
When the process is complete the display will show Span Calibrated. It will then show an instruction to
remove gas.
19. Remove the Calibration Cap and wait for the test gas to clear (~ 30 s). Ensure that the gas reading has
returned to zero.
20. Press Enter.
21. Refit the Standard Weather Protection and the two retaining nuts.
22. Press Enter to release the 4-20 mA output signal.
23. Press Escape to return to the main menu.
19. Appendix 1 –
WARNING
target gas.
88
Searchpoint Optima Plus with optional HART output
®
Operating Instructions
2108M0550