MAN0923_Issue 3_04/15
Touchpoint Pro
Operating Instructions
90
6. Commissioning
1. If not already logged in, login with a valid engineer level user name
2. From the
System Status
screen select the
Inputs
icon
then select the channel to be calibrated
3. Select
Calibration
from the popup menu
4. Select
Zero
Adjust
, and when ready press
OK
and apply clean air to the sensor
5. View the gas reading until it is stable, and then press
Accept
6. Confirm that the gas reading is zero, and press
Save
then
OK
7. Select
First
Span
8. Enter the concentration of the span gas and press
Accept
9. When ready press
OK
and apply gas to the sensor
10. View the gas reading until it is stable, and then press
Accept
11. Confirm that the gas reading is correct, and press
Save
then
OK
12. Remove the span gas from the sensor, and confirm that the gas reading has returned to zero
13. Select
Clear Inhibit
to remove the inhibit from the channel
6.17 Calibrate mA input channel loops
WARNING
Where the sensor / transmitter has the facility, the mA loop should always be calibrated at the
Touchpoint Pro controller by forcing signal levels at the sensor / transmitter. Any gas calibration
required must be carried out at the field device according to the manufacturer’s instructions.
The Touchpoint Pro controller calibration should not be used to adjust for deficiencies in
the sensor / transmitter gas calibration. Failure to observe this can result in significant
accuracy errors.
Caution: Ensure that any executive action is inhibited before starting this test
Note: Engineer level access is required
Note: If the sensor is an Oxygen sensor that is not being used with a transmitter that has a force mA
function, the zero gas should be 100% v/v Nitrogen, and the span gas should normally be air at 20.9% v/v
Oxygen. The Touchpoint Pro controller calibration should not be used to correct deficiencies in the sensor
calibration; instead carry out a gas calibration at the sensor according to the manufacturer’s instructions.
Note: If you wish to enable a calibration reminder for the channel, please edit this setting before starting
calibration (see Commissioning, Editing a Configured Channel and Configurable Parameter Reference
Guide, Calibration Reminder Settings)
To calibrate the mA loop of an input channel, please follow the procedure below in combination with the
relevant instructions in the sensor manual.
