Honeywell SmartLine, User Manual

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4. Start up
4.6. Calibrating the transmitter
46 SmartLine Wireless User's Manual Revision 2
4.6 Calibrating the transmitter
Overview
The OneWireless User Interface must be used to calibrate the transmitter.
Calibrate zero
Calibrates the sensor to correct the input measurement due to fill fluid and transmitter position
effects once the transmitter is installed and operating under process conditions.
ATTENTION
Setting user trim points will effectively override the calibration zero. Normally
the calibration zero is only required if you do not intend to provide process-
specific trim points.
Table 4-1: Calibrate zero
Step Action
1
Apply zero input pressure for your transmitter’s pressure type as follows.
Differential: With process pressure applied, connect HP and LP inputs together using the
crossover valve on the 3-valve manifold or other equivalent method.
Gauge: Isolate the input pressure from the process and vent to the atmosphere.
Absolute: Due to the difficulty of applying absolute 0 psi, zero calibration of the AP transmitter is
not recommended.
2 In OneWireless User Interface,
set the transmitter’s Software Write Protect option to Disable.
3
In OneWireless User Interface, set the
transmitter’s channel to Out of Service.
4 Verify the channel is out of service (OOS) message.
If the transmitter is write protected a Read Only error will be displayed. Go to step 2.
If the channel is not out of service a WRONG MODE error will be displayed. Go to step 3.
5
Select CAL ZERO. With CAL ZERO displayed, press Enter to set the current applied pressure
to zero. If successful, t
he display will briefly show “ZERO SET”. If unsuccessful the display will
briefly show “ERROR”.
6 When ready, in OneWireless User Inter
face return the transmitter’s channel to service
Automatic and set Software Write Protect to Enable.