Wilkerson ER2 - Manual (Page 4)

Cover
Terminal
Block
Control
Board
Housing
Body Cap
Mid Plate
Body
Bottom Plug
Intake Valve
Connector
Span
Adjustment
Potentiometer Zero
Adjustment
Potentiometer
Exhaust
Valve
Connector
Jumpers
LCD Board
Ribbon Cable
Connector
Figure 5
Internal
Pressure
Adjustment
Screw
Zero and Span Adjustment
The zero and span adjustment was set at the factory and should
not require any further adjustment. If the zero and span do need
to be adjusted, energize the unit. Input 0 VDC to the control
signal and using a volt meter, measure the output on the
position #3 of the terminal block. The output should be -0.01 to 0
VDC. If not turn the zero potentiometer
(Figure 4) until the
output is correct. To adjust the span, attach an external
pressure gauge and apply 8 VDC to the control signal. Then
adjust the span potentiometer
(Figure 4) until the P2 pressure is
80% of the range selected [i.e. 24 psig (1,6 bar) for 0–30 psig
(0–2 bar), 48 psig (3,3 bar) for 0–60 psig (0–4 bar), 72 psig (4,9
bar) for 0–90 psig (0–6 bar), 100 psig (6,8 bar) for 0–125 psig
(0–8,6 bar)]. This completes the zero and span adjustments.
Now carefully replace the cover. It can be installed in two
positions, 180 degrees apart from each other. Then replace
the two securing screws.
The unit is now ready for operation. Supply pressure and
power to the unit can be turned on.
Figure 4
If Internally Controlled (On LCD Units Only)
To adjust the pressure, pry the internal adjustment cap off.
With power and pressure to the unit turn the adjustment screw
(Figure 5) until the desired pressure is achieved then replace
the cap.