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I. INSTALLATION AND OPERATION
A. Start Up and Installation
1. The GA-170 can be ordered for use with single phase A/C power of either 120 or 240 VAC at 50
to 60 Hz. When connecting A/C power to the instrument, it is imperative that the A/C source be
well grounded. Insufficient A/C grounding will disrupt proper operation of the instrument.
2. Sensor Monitor Communication: Each monitor can be connected to one up to four sensors.
The sensors are 24VDC loop powered by the monitor and the sensors provide a 4-20mA signal to
the monitor. See Figure 13.
3. Initial Power Up: Each time the GA-170 power is turned on the alarms will be inactive for five
minutes. A countdown will be shown on the display. This allows for the sensor(s) to stabilize.
4. Gas Density: For measured gases that are heavier than air, the gas sensor should be mounted
12" to 24" (30 to 60 cm) from the floor (Example: Figure 1a–Chlorine & Sulfur Dioxide). For
measured gases that are lighter than air, the gas sensor should be mounted 12" to 24" (30 to 60 cm)
from the ceiling (Example: Figure 1b–Ammonia).
FIGURE 1a FIGURE 1b
FIGURE 2
5. Sensor Protection: The sensor should not be exposed directly to extreme temperatures and/or
conditions. It is very important not to allow the sensor element to get wet from rain or any other
source because water will cause premature failure of the sensors.
6. Sensor Start Up: The sensor calibration cap must be removed upon start up. Upon removing
the sensor cap, be sure to store it for later use. See Figure 2. The cap is used to protect the sensor
during shipment and storage and the two ports on it are to be used for calibration with test gas.
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