Omega FMA 5400A - 10% Flow Adjustment; 25% Flow Adjustment (Using R52 Potentiometer)

7.2.8 10% Flow Adjustment
Using the flow regulator, adjust the flow rate to 10% of full scale flow according to
the calibrator. Check the flow rate indicated against the flow calibrator. Adjust the
setting for potentiometer [R33] by using the insulated screwdriver through the
access window, until the output of the flow meter reads 0.5 Vdc ±63mV (or 5.6mA
±0.25mA).
7.2.9 25% Flow Adjustment (using R52 potentiometer)
Using the flow regulator, adjust the flow rate to 25% of full scale flow according to
the calibrator. Check the flow rate indicated against the flow calibrator. The output
of the flow meter should read 1.25 Vdc ±63mV (or 8.0mA ±0.25mA). If the reading
is outside of that range, place the jumper at [J1.A] as appropriate to increase or
decrease the signal. Adjust the setting for potentiometer [R52] by using the insu-
lated screwdriver through the access window, until reading is within specification.
7.2.10 50% Flow Adjustment
Using the flow regulator, increase the flow rate to 50% of full scale flow. Check the
flow rate indicated against the flow calibrator. The output of the flow meter should
read 2.50 Vdc ±63mV (or 12mA ±0.25mA). If the reading is outside of that range,
place the jumper at [J1B] as appropriate to increase or decrease the signal. Adjust
the setting for potentiometer [R38] by using the insulated screwdriver through the
access window, until reading is within specification.
7.2.11 75% Flow Adjustment
Using the flow regulator, increase the flow rate to 75% of full scale flow. Check the
flow rate indicated against the flow calibrator. The output of the flow meter should
read 3.75 Vdc ±63mV (or 16mA ±0.25mA). If the reading is outside of that range,
place the jumper at [J1C] as appropriate to increase or decrease the signal.
Adjust the setting for potentiometer [R39] by using the insulated screwdriver
through the access window, until reading is within specification.
7.2.12 100% Flow Adjustment
Using the flow regulator, increase the flow rate to 100% of full scale flow. Check
the flow rate indicated against the flow calibrator. The output of the flow meter
22
LINEARIZER
FUNCTION
J1A (10
or 25%)
J1B
(50%)
J1C
(75%)
J1D
(100%)
Decrease 1 - 2 4 - 5 7 - 8 10 - 11
Increase
2 - 3 5 - 6 8 - 9 11 - 12
3
6912
2
1
4
5
8
7
11
10
ABCD
FIGURE 7-2 FMA 5400A/5500A SERIES MAX. FLOW 10, 50, 100 L/min
CALIBRATION POTENTIOMETER AND JUMPERS