Instruction Manual
D103292X012
C1 Controllers and Transmitters
March 2017
12
Calibration: Proportional-Only Controllers
Unless otherwise indicated, key number locations are shown in figure 4.
Provide a process pressure source capable of simulating the process pressure range of the controller. If an output
pressure gauge is not provided, install a suitable pressure gauge for calibration purposes.
Figure 4. Proportional-Only Controller Adjustment Locations
PROPORTIONAL BAND
ADJUSTMENT KNOB
PRESSURE SETTING KNOB
(KEY 58)
PRESSURE SETTING
DIAL (KEY 6)
FLAPPER (KEY 40)
NOZZLE (KEY 54)
CALIBRATION ADJUSTER (KEY 36)
ADJUSTER SCREWS (KEY 48)
GE28280-B
E1059
Connect a pressure source to the supply pressure regulator and be sure the regulator is delivering the correct supply
pressure to the controller. The controller must be connected open loop (Open loop: The controller output pressure
changes must be dead ended into a pressure gauge). The following procedures use a 0.2 to 1.0 bar (3 to 15 psig)
output pressure range as an example. For a 0.4 to 2.0 bar (6 to 30 psig) output range, adjust the values as appropriate.
1. Complete the above connections and provide a process pressure equal to the sensing element range.
2. Rotate the proportional band adjustment knob, shown in figure 4, to 1.5 (15 percent proportional band).
3. Verify that the calibration adjuster screws (key 48) are at mid-position in the calibration adjuster (key 36) slots.
Depending upon the controller action, perform one or the other of the following procedures.
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