2-16
reset through a switch that has a momentary contact opening (normally
closed set of contacts). Connections are made to terminal strip J16,
terminals 1 and 2 with the wiring entering the enclosure through the
hole on the left side of the instrument. The switch must have signal-
level contacts, typically gold plated. The maximum distance from the
reset switch to the monitor, using 18 AWG wire, is 250 feet (76 m). The
maximum wire size that these connectors can accept is #12 AWG.
Audible Alarm Output
An output is provided to drive the piezo-electric horn on the bottom of
the unit (FIGURE 1-5). This output is available for customer use,
provided that the beacon is not installed.
Auxiliary Input - Use UL Listed Devices
A 4-20 mA analog input can be made to the monitor from another
device such as another refrigerant monitor or an oxygen monitor. The
input wiring should be brought into the enclosure through the hole on
the left side of the instrument and connected to terminals 3 (AUX) and 4
(GND) on terminal strip J16. It is recommended that Listed #18
AWG,
twisted pair wire be used; maximum wire length is 250 feet (76 m). The
maximum wire size that these connectors can accept is Listed #12
AWG. Shielded wire is necessary. Ground the shields of all cables at the
transmitting end of the signal. Do not ground or connect the shield at
the Chillgard RT Refrigerant Monitor.
CAUTION
All field wiring must be done in accordance with national and
local electrical codes.
Initial Calibration
WARNING
Calibrate after installation; otherwise, false or erroneous
readings can result.
The initial calibration is the same as the routine calibration. Refer to
Section 4 for this procedure.
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