16
D. Installing and Confi guring Temperature
1. Determine adequate mounting location for thermocouple and support bracket. Mount the support
bracket to a wall or fi xture using appropriate hardware (hardware not supplied with GA-180).
2. If necessary, connect the thermocouple to the thermocouple circuit board using the TI + and TI-
terminals. Connect the Red wire to TI- and the Yellow wire to TI+. Only type K thermocouples
can be used on the GA-180.
3. If necessary, connect the thermocouple board (MB141) to the display through the Modbus connector.
4. If necessary, enable the thermocouple communication. Follow the screen tree (Figure 11) to
navigate to the screen “thermocouple enable”. Change to yes by pressing the
key and cycle
the power. Unless you turn the power off and back on, the change will not take effect.
5. Check communication by confi rming that the appropriate live temperature screen and
temperature alarm screen have appeared in the correct area (Figure 9).
6. Using the screen tree (Figure 10), navigate to the “Temperature Units” screen. Units can be
adjusted between “F” for Fahrenheit and “C” for Celsius. Select the appropriate unit using the
and
keys.
7.
Press
and select the high and low temperature alarm points. Values can be selected anywhere
from 0-255 F/C. Hydro Instruments recommends the high temperature alarm setting be at least
20ºF lower than the fusible plug melting point of gas cylinders and/or ton containers. Contact
your chemical supplier to confi rm the temperature for the fusible plug melting point. Other
equipment or local restrictions may apply. Each value is adjusted using the
and
keys.
8.
Press
and select the alarm delay time. This setting sets the amount of time the temperature
must remain above the high temp. alarm setting or below the low temp. alarm setting before the
alarm will activate. Values can be set in the range of 0-60 seconds. Values are adjusted using the
and
keys. Press
to exit the thermocouple confi guration.
E. Alarms and Outputs
1.
Alarm Status Defi nitions:
a. Normal – The sensor is operating normally and is below the “Danger” set point.
b. Danger – The sensor reading has reached or exceeded the “Lo Set” level, but is lower than the
“Hi Set” level. Refer to Section II.C and Figure 10 Screen 2 for additional details.
c. Alarm – The sensor reading has reached or exceeded the “Hi Set” level. Refer to Section II.C
and Figure 10 Screen 2 for additional details.
d. Error – The sensor signal has been lost.
Alarms: The GA-180 comes with two common relays and eight sensor relays to every four sen-
sors ordered. The two common relays (relay 33 and relay 34) can be confi gured to any of the alarm
conditions outlined in Table 2. The sensor relays can be confi gured to any of the alarm conditions
outlined in Table 2. All relays are dry contacts with a maximum power rating of 10 A.
To change any alarm relay to an alarm condition outlined in Tables 2 & 3. Follow the confi guration
sceen layout screen tree. Once at the appropriate relay, change the alarm condition by pressing the
key. Cycle the power to save the new condition.
