MAN0905_Issue 7_07/17
Searchpoint Optima Plus with optional HART
®
output
Operating Instructions
2108M0550
46
10.7 Calibration
Searchpoint Optima Plus is factory calibrated and does not require routine calibration. In most cases, a
re-zero will correct any inaccuracy in the gas reading. It is strongly recommended that a span calibration is
not carried out.
In the unlikely event that a span calibration is required, use a cylinder of the target gas, of approximately
50 %FSD, with an accuracy of at least ± 2 %.
Note: Searchpoint Optima Plus will accept a span calibration gas concentration of between 30 %FSD and
125 %FSD, however this facility is reserved for use in specialist applications.
Do not calibrate Searchpoint Optima Plus during periods of very high or low atmospheric pressure, very
strong winds or storms.
Caution: Gas readings will be generated during this procedure.
Note: The unit should be powered up for 1 hour before a calibration is done.
1. Using a ½ inch / 13 mm A/F open ended spanner, unscrew the two retaining nuts and remove the
Standard Weather Protection.
2. Fit a Calibration Cap to the Searchpoint Optima Plus. Ensure it is pushed on fully.
3. Select
Calibrate
then
CalSensor
. (This will inhibit the 4-20 mA output signal).
4. 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.
5. 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.
6. Press
Enter
to begin span calibration.
7. Press
Enter
.
8. Use
and to set the concentration of the calibration gas. When it is correct, press
Enter
.
9. Apply calibration gas at a rate of 1 – 1.5 litres per minute. Wait for the gas reading to stabilise
(~ 30 - 60 s).
10. Press
Ente
r.
When the process is complete the display will show Span Calibrated. It will then show an instruction to
remove gas.
11. Remove the Calibration Cap and wait for the test gas to clear (~ 30 s). Ensure that the gas reading
has returned to zero.
12. Press
Enter
.
13. Refit the Standard Weather Protection and the two retaining nuts.
14. Press
Enter
to release the 4-20 mA output signal.
15. Press
Escape
to return to the main menu.
10. Maintenance using
SHC1 Handheld Interrogator
