SOR 534HS Two-Wire Pressure Transmitters - Manual (Page 3)

Form 953 (03.13) ©SOR Inc. 3/12
Power
Supply
11 - 30 VDC
milliammeter 4 -
20 mA
Black
Case
Ground
Zero
Not Used
Span
Bare
Red
A pressure source with a calibrated reference gage, a milliammeter and a DC voltage supply
are required. Note the adjustable range on the instrument nameplate. For both zero and span
adjustments, turn the adjustment screw clockwise to increase, counterclockwise to decrease.

Connect the transmitter as shown in . Case ground must be connected to earth
ground to ensure EMI/RFI protection.

Apply pressure at which 4 mA output is desired. (Zero may be adjusted +10% of the
upper range limit.)

When zero is elevated above 0 psi, maintain 80% of the range of the transmitter range
between the 4 mA and 20 mA points.

With pressure source steady at the desired zero level, rotate the zero adjustment (#1)
for a 4 mA indication on the milliammeter.

Apply pressure at which 20 mA output is desired. Span may be adjusted from 20 to
100% of the upper range limit. (Maximum turndown is 5:1.)

With pressure source steady at the desired span level, rotate the span adjustment (#3)
for a 20 mA indication on the milliammeter.

Repeat Steps 2 through 6 as needed if offsetting 4 mA from the normal zero point.
If interaction occurs, turn zero and span 15 turns counterclockwise. Repeat Steps 2
through 7 above.