19
Reference Manual
00809-0100-4808, Rev DA
Transmitter Functions
October 2016
Transmitter Functions
Note
The transmitter must be within three percent of true zero (zero-based) in order to calibrate it using the
zero trim function.
3. Follow the commands provided by the communicator to complete the adjustment of the zero trim.
2.12.5
Full trim
To calibrate the sensor with a HART Communicator using the full trim function, perform the following
procedure.
1. Assemble and power the entire calibration system including a transmitter, HART Communicator,
power supply, pressure input source, and readout device (see
Figure 2-9
).
Note
Use a pressure input source with sufficient accuracy and allow the input pressure to stabilize for 10
seconds before entering any values.
2. From the communicator menu select
1 Device setup
>
2 Diagnostics and service
>
3 Calibration
>
3 Sensor trim
>
2 Lower sensor trim
to prepare to adjust the lower trim point.
Note
Select pressure input values so the low and high values are equal to or outside the 4 and 20 mA points.
Do not attempt to obtain reverse output by reversing the high and low points. The transmitter allows
approximately a five percent URL deviation from the characterized curve established at the factory.
3. Follow the commands provided by the communicator to complete the adjustment of the lower value.
4. Repeat the procedure for the upper value, replacing
2 Lower sensor trim
with
3 Upper sensor trim
in
Step 2
.
HART Fast Keys
1, 2, 3, 3