Simulate Ph Input - Emerson Rosemount FCL-01 Reference Manual

Reference Manual
00809-0200-3412
10.9

Simulate pH input

To simulate a pH measurement, connect a standard millivolt source to the transmitter.
If the transmitter is working properly, it will accurately measure the input voltage and
convert it to pH.
Procedure
1. Set automatic temperature correction to
2. Disconnect the sensor and jumper wire between the
3. Press INFO and choose
4. If a standard millivolt source is available, disconnect the jumper wire between
5. Calibrate the transmitter using the manual buffer procedure.
6. To check linearity, set the voltage source to the value shown in the table and verify
Rosemount FCL 56
.
25 °C
See Temperature.
terminals.
sensor 2 (pH)
The input voltage should be
data stored in the transmitter may be offsetting the input voltage, the displayed pH
may not be exactly 7.00.
and
REFERENCE IN pH
Figure 10-2: Simulating pH input
Be sure to jumper the
IN REFERENCE
Use 0.0 mV for Buffer 1 (pH 7.00) and -177.4 mV for Buffer 2 (pH 10.00).
If the transmitter is working properly, it should accept the calibration. The slope
should be 59.16 mV/pH, and the offset should be zero.
that the pH and millivolt readings match the values in
Table 10-2: Voltage and pH
Voltage (mV)
295.8
177.5
59.2
Manual
.
, and the pH should be
0 mV
and connect the voltage source as shown in
and
GND SOL
pH (at 77 °F [25 °C])
2.00
4.00
6.00
Troubleshooting
October 2023
and set manual temperature to
and
IN REFERENCE IN pH
. Because calibration
7.00
Figure
terminals.
Table 10-2
IN
10-2.
59