13
O
PTIONAL
F
EATURES
Fahrenheit Option (F)
The standard 140 displays temperature in degrees Celsius.
The “F” option indicates that the unit is
calibrated and displays degrees Fahrenheit.
High Resolution Display (H)
The high-resolution option allows temperature monitoring and alarm setting to 0.1ºC. All the TM1A
standard features remain the same.
Relay Option (R)
The relay option consists of a single-pole double-throw (SPDT) relay that changes state (switches)
with the loss of line power or with the presence of an alarm condition.
NOTE: The relay is rated for pilot duty operation only. Do NOT use it for control switching. The relay
contacts and connections are rated at 30v/1A.
In normal applications, the relay signals remote or central monitoring systems that an alarm condition
has occurred at the equipment being monitored.
If the 140 unit has the relay option, the relay will “pull-in” when line power is present. If an alarm
condition lasts for a designated time (the “relay delay”), the relay will “drop out,” causing the relay
contacts to switch. If the alarm condition does not last long enough for the relay delay to time out, the
relay will not go into its alarm position
. The relay will also “drop out” if power to the alarm is lost,
acting as a power loss detector. When the main power to the alarm is lost, the bicolor LED on the
upper left of the panel will go dark.
NOTE: Mute button, beeper or LED activities do not affect relay status.
Battery Back-Up (B)
TM1A units that have the battery back-up option ship with the battery in place and connected but
disabled. Remove the screw located on the outside of the left side of the module to activate the
battery option.
When line power is present, all the normal features of the TM1A are operating. When line power is
lost, the battery provides power to continue to display the temperature of the area being monitored.
Testing the battery:
The battery recharges when the unit is plugged into line power. To test the battery, push the ALM
TEST button on the front panel. The following should happen:
•
The display will show a small BAT designation.
•
The Alarm LED will light red.
•
The beeper alarm will sound full on.
•
On units with the relay option, the relay will switch.
If the button is held longer than 6 seconds, the unit will reset, the activity LED will stop blinking, and
the unit will not restart until 5 seconds after the button is released.