RKI Instruments GD-K77D User Manual
Page 19
Model GD-K77D
Operator’s Manual
Installation • 14
WARNING:
The alarm contacts on the Model GD-K77D are designed to take a
resistance load and not an inductive load. (An inductive load can be
created by a patlight, external relay, buzzer, siren, fan, fluorescent
light, motor, etc.)
When an inductive load is present, a very high reverse voltage may be
generated that can melt the alarm contacts on the Model GD-K77D,
damage the external alarm, or damage the CPU if one is connected to
the system. Also note that the intrusion of electrical noise in the alarm
circuit can cause the same problems generated by an inductive load.
To avoid these problems, whether created by an inductive load or by
noise, do not use an inductive load and protect the alarm contacts on
the Model GD-K77D with the appropriate surge protectors.
Grounding
Attach ground wires to the ground terminals on the Model GD-K77D, labeled chassis
(earth) ground bolts in the diagram below, before turning on the power to the Model GD-
K77D.
WARNING:
Be sure to ground the Model GD-K77D properly for safe operation. Do
not connect the ground wires to the sample tubing.