Installation / Operation Manual
Notes:
1. This procedure initially sets the detector with 0-5 volts to which you adjust the 4-20 mA output, then the
reading is offset to match the amount of water in the oil in the probe.
2. The 4-20 mA loop is internally powered from the 4528-A. DO NOT USE an external loop power source.
The 4528-5A Detector Card is designed to supply a 4-20 mA signal direct to an external readout device. It
is not designed to be used with a Model 4728 Readout Unit.
3. Maximum Loop Resistance is 250 ohms.
4. Shielded, twisted pair wire is recommended for the 4-20 mA output. Ground the shield at one end of the
5. Starting in mid-year 2000, the 4 mA pot adjusting screw will be accessible through a hole, just to the
right of the “test” wording, for adjustment without removing the aluminum detector face plate. Be aware
that this adjusts the 4 mA only, the 20 mA is automatically adjusted electronically.
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