Primes PocketMonitor - Current Loop Interface (OPTION); Interface Description; Socket Pin Functions; Temperature Measurement Formula

35,0(6
PocketMonitor PMT
23
Revision 01/2017 EN
12 Current Loop Interface (OPTION)
This version of the separate display- and operating unit has an additional 4-20mA-current
output. The power is given out by means of an impressed current. A power of 0 Watt
equals a current of approx. 4mA. The current of a maximum of 20mA equals 16bits.
Current Loop Interface
Fig. 12.1: Display- and operating unit with current loop interface
Socket, 5-pole
View: Plug Side
Pin Function
1
2
5
4
3
1 GND
2 Supply voltage +24V, max. 30mA
3 Current output 4 ... 20mA (maximum load of 500ohm)
4 Start impulse for 20s measurement (+24V regarding GND)
5 Start impulse for 10s measurement (+24V regarding GND)
When starting the measurement, i.e. when the timer button is pressed, the current
temperature is sent to the current loop interface. The temperature can be measured by
means of the following formula:
Type Calculation Formula
PMT 01p; PMT 70icu T = (I − 4mA) • 13.652 °C/mA
PMT 120icu T = (I − 4mA) • 27.307 °C/mA
PMT 002p; PMT 05p; PMT 30p T = (I − 4mA) • 6.827 °C/mA
T = Temperature in Degree Celsius
I = Impressed Current in mA