Nexen EN40-2B 912004 - Manual (Page 7)

FORM NO. L-20097-F-0605 (7)
ADJUSTMENT
Nexen’s EN40 has been factory adjusted and should
not require further adjustment with appropriate supply
pressure (See Table 1).
NOTE: If less than rated pressure is available for
“Psup,” the output of the EN40 will be proportionately
lower.
EN40 is available in four models. The model designation
can be found on the serial number tag, located on the
front of the EN40. If adjustment is required, determine the
model and refer to Table 1 for the correct values called
out in the adjustment procedure.
TABLE 1
ZERO ADJUSTMENT
1. Remove Gauge Port Plug and install a suitable air
pressure gauge.
2. Apply Imin input signal (See Table 1).
3. Remove Zero Adj. cover from “EN40.”
4. Using a screwdriver, adjust “EN40” output to
Pmin(rotate clockwise to increase, counter
clockwise to decrease) (See Figure 12).
NOTE: Do not adjust pressure to “0” psi. There must
be positive pressure at the poppet and seat.
5. Replace Zero Adj. cover.
FIGURE 12
Rotate to adjust
output to “Pmin”. zero
gauge
GAUGE PORT
SPAN ADJUSTMENT
NOTE: Supply pressure must be Psup.
1. Perform ZERO ADJUSTMENT (previous
section).
2. Apply Imax input signal (See Table 1).
3. Remove Top Cover from “EN40.”
4. Using a screwdriver, adjust Span Pot to obtain
Pmax output (See Figure 13).
NOTE: Repeat “ZERO ADJUSTMENT” & “SPAN
ADJUSTMENT” to ensure settings have not drifted
during calibration.
FIGURE 13
Span Pot
5. Remove air pressure gauge and install plug.
6. Replace Top Cover.
Model EN40-1B EN40-2B EN40-1A EN40-1D
Imin
(mADC)
4 10 4 4
Imax
(mADC)
20 50 20 20
Pmin (psi) 1.5 1.5 1.5 1.5
Pmax (psi 85 85 57 15
Psup (psi) 100 100 71 20