Reference Gas; Sadp Mini 4-20 M A; Sadpmini 4-20Ma Circuit - Alpha Moisture Systems SADPmini Instruction Manual

out and allow the sensor to stabilise. Start the AutoCal routine and enter the ambient moisture
value into the SADPmini when asked to enter the AutoCal Value.

14.2 Reference gas

Connect the SADPmini to a reference gas, raise the SADPmini head and ensure that a flow of
5 to 8 L/M is obtained. Allow the sensor to stabilise so that the gas surrounding the sensor in
the SADPmini head is representative of the reference gas moisture value. Start the AutoCal
routine and enter the reference gas moisture value into the SADPmini when asked to enter the
AutoCal Value.
15 SADPmini 4-20mA
Note: The 4-20mA output should not be operated while the instrument is charging.
The 4-20mA signal gained from the SADPmini is loop powered only. The connections are: -
4-20mA output
Loop Power input
1 2
CON066
6
Note: See section 16 for details of CON066 assembly

15.1 SADPmini 4-20mA Circuit

ZVP4424A
CON066 connector Pin 5
CON066 connector Pin 9
3
4 5
7 8 9
10
0.6V
Page 23 of 33
Viewed from solder bucket side
Loop Return
+ve Loop Supply
+ve Loop Supply (pin 9)
85
Loop Return (pin 5)
V
V
EXT
R
EXT