| IWTxT SERIES
WIRELESS 4-20mA TRANSMITTER OPERATING MANUAL
C
opyright © 2021 Sensata Technologies, Inc.
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5.1 Battery life
The update rate and settling time affects how long the Excitation and Wireless batteries
will last. The following gives the battery life in days with various configurations.
4-20 mA Transmitter Excitation Battery Life
2 off PP3 10.8 V Lithium Thionyl Chloride batteries in series (assume 1000 mAh capacity)
Sleep Time (Sec)
60
120
300
600
30
Sleep Time (Min)
1
2
5
10
0.5
Settling Time (S)
0.5
440
882
2205 4412 220
1
222
445
1112 2225 110
2
112
225
565
1130 58
4
58
118
292
582
30
So, with a settling time of 0.5 seconds, and a sleep time of 120 seconds, the expected
excitation battery life is 882 days.
Wireless Transmitter Battery Life
AA Lithium Thionyl Chloride battery (assume 1000 mAh capacity)
Sleep Time (Sec)
60
120
300
600
30
Sleep Time (Min)
1
2
5
10
0.5
Settling Time (S)
0.5
1773
2283
2759 2965
1225
1
1308
1858
2485 2799
822
2
859
1355
2072 2517
496
4
509
878
1556 2095
276
So, with a settling time of 0.5 seconds, and a sleep time of 120 seconds, the expected AA
battery life is over 6 years.
5.2 Operation of the IWTxT 4-20 mA Wireless Transmitter
Remove the pull tab from the battery terminal.
Push and release the push button to wake the sensor and observe the LED.
•
LED does a double green flash – successful send
The button wakes the sensor up and the first green flash is seen. The sensor powers up the mA
transmitter and waits for the settling time. The mA value is then read and transmitted to the IWR Receiver.
If the data send is successful a second green flash is seen. It will now sleep for the sleep time, then wake
and repeat this process.
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