BioProTT
TM
Flow Measurement System
Version 1.00
page 54 of 75
8.4.2
Method 2
– Providing Power Externally in Current Loop and
Measuring with Ampermeter
Pin No
Signal
Wire colour
(in supplied cabling)
Connected with
1
24 V (24C_in)
Brown
Connect pin 1 with pin 2
2
Current Loop +
White
Connect pin 2 to “+” of battery /
24V DC power source
3
Ground in
(GND_in)
Blue
Connect pin 3 to the appropriate
connector of your reading device
/ data logger, e.g. “return” or “-“
of an ampermeter. Close loop by
connecting also to “-“ of battery
4
Current Loop -
Black
Connect pin 4 to appropriate
connector of your reading device
ampermeter e.g. “send” or “+”
Figure 18: Schematics - looking at pins of rear of flow meter of either Flow or RSS socket
Tolerances for current measurement (range of ampermeter 4-20 mA) are as follows:
Max 1% + 5 digits at > 50.000 mA range
Internal resistance < 10 Ohm
3
4
2
1
PIN 1: +24 V
PIN 3: Ground (GND)
PIN 4: Current Loop (-)
PIN 2: Current Loop (+)
Return (-)
Send(+)
of ampermeter
-
A +
External
Power Supply
+ -
