Honeywell SmartLine User Manual page 62

4. Start up
4.6. Calibrating the transmitter
Definitions:
For compound characterized meter bodies the following definition is used:
Positive applied pressure value: A positive applied pressure is an applied pressure where the
pressure at the high side of the meter body is greater than the applied pressure at the low side of
the meter body thus asserting a "positive" relative pressure between the high and low side of the
meter body.
Negative applied pressure value: A negative applied pressure is an applied pressure where the
pressure at the high side of the meter body is lower than the applied pressure at the low side of
the meter body thus asserting a "negative" relative pressure between the high and low sides of
the meter body.
One side calibration: Often only a positive calibration pressure source is available and compound
calibration is done by applying regulated pressure relative to ambient air to only one side of the
meter body with the other side of the meter body vented to ambient air. In this way a positive
calibration pressure applied to the low side of the meter body can be used to apply "negative"
relative pressure value during calibration of the lower calibration point. Both the upper and lower
calibration points can be either positive or negative values as long as the upper calibration point
is greater than the lower calibration point.
Compound Calibration Procedure:
Select the upper and lower calibration points where the transmitter is to be calibrated:
1. Select the Cal Clear command to remove any zero bias from the transmitter and return
the calibration to a gain of 1 and calibration offset zero in respect to the factory
characterization. The calibration status should return SUCCESS and the Calibration
Source will be set to NONE. This operation will set the device to a known good state.
If the calibration status does not return SUCCESS stop and call Honeywell customer
support for further assistance. Cal Clear will clear any previous user calibration including
and zero bias established using a CAL ZERO command. Factory calibration is preserved
but it is not applied.
Note: Make sure the transmitter is in the OOS (Out of Service) state prior to beginning
calibration.
2. Select the upper and lower calibration points where the transmitter is to be calibrated.
The upper and lower calibration points can be either positive or negative values as long
as the upper calibration point is greater than the lower calibration point.
3. Set the lower calibration point to the pressure value to be applied for lower calibration.
This calibration point can be either a positive or negative value as long as it is less than
the upper calibration point.
4. Set the upper calibration point to the pressure value to be applied for upper calibration.
This calibration point can be either a positive or negative value as long as it is greater
than the lower calibration point.
5. Apply the lower pressure to the meter body. When applying a negative pressure the high
side of the meter body will be at a lower pressure than the low side.
48 SmartLine Wireless User's Manual Revision 2