ROTRONIC MBW 973 - Manual (Page 27)

Back Panel Connections 23
Analog Outputs
Analog outputs, if this option is installed, are used for connection of external voltmeters or chart
recorders. The analog outputs are independently configurable.
If you wish to make your own cables, the 973 requires a 2 pin
connector, LEMO (www.lemo.ch) part number FGG 1B 302
CLAD 42.
When viewing the solder tubs of a disassembled 2-pin LEMO
connector, pin 1 is usually identified with a full or partial circle
drawn around it. Pin 2 should have no identifier.
Wire the cable according to the following:
Pin Position Signal
1 Top +V
2 Bottom
-V
When the 2-pin LEMO connector is properly assembled, you will notice that the red dot of the
connector housing will be aligned at the top directly above pin 1.
Gas Input and Output
The gas input and output fittings are used for connection of the 973 to the sample gas. Based
on the original configuration of your system, it will generally contain ¼” or 6 mm Swagelok
®
tube
fittings.
While a connection to the gas input is most likely required, the gas output connection is often left
unconnected. If the fittings are capped, you’ll need to remove those caps for operation or
connection of sample lines.
Barometric Pressure Input
Some systems are equipped with a high accuracy barometric pressure sensor for measurement
of the atmospheric pressure. Systems with a barometric pressure sensor have the pneumatic
fitting of that sensor brought to the back panel. This fitting must remain open for operation.
Red Dot
aligns with
Pin 1