Sensaphone 2800 - Manual (Page 131)

Chapter 8: Sensors
129
POWER SUPPLY AND BATTERY INSTALLATION
The 4-20mA sensor is powered by a 5VDC plug-in power supply
(included). Three AAA alkaline batteries are used as a back-up in
the event of an AC power failure. The battery back-up time is totally
dependent upon the average current in the loop - approximately
three to six hours.
Connect the power supply wires to the PWR terminals. Connect the
wire marked “+” to the “+” screw terminal and connect the “-” wire
to the “-” terminal on the PWR terminal strip. Plug-in the power
supply. Install the 3 AAA alkaline batteries as shown:
+
+
+
–
–
–
+ –
AAA
AAA
AAA
+SENSOR- +PWR-
4-20mA
Transducer
+ –
After you have configured the channel, installed the AAA batteries
and/or connected the AC power supply, replace the cover and
secure it by turning the two hex screws on the bottom of the cover
counterclockwise.
BATTERY INFORMATION
The projected battery life is dependent upon many factors including:
rated capacity of battery, state of charge, temperature, and sensor
distance from the 2800 (or repeater). The farther a sensor is from its
receiver the more power it will require to transmit its signal, thus
reducing battery life. Higher temperatures will also decrease battery
life. Always use high quality alkaline batteries in Sensaphone 2800