Teledyne OT-2 - Oxygen transmitter system - Manual (Page 22)

3 Operation Model OT-2 System
3-4 Teledyne Analytical Instruments
To connect gas lines to the Model OT-2 System:
1. Insert the tube into the tube fitting, and finger-tighten the
nut until the tubing cannot be rotated freely, by hand, in
the fitting. (This may require an additional 1/8 turn
beyond finger-tight.)
2. Hold the fitting body steady with a wrench, and with
another wrench rotate the nut another 1-1/4 turns.
All gas connections, Sample In, Sample Return and Span Gas
In are made at the connectors located on the left side of the
system enclosure as shown in Figure 3-2.
SAMPLE IN: The gas connection for the sample is made at the
SAMPLE IN connector.
The internal gas pressure regulator is factory preset to approxi-
mately 3 psig which will keep the system flowmeter reading in an
acceptable range (0.1-1 scfh). The sample in pressure can be 6-40
psig.
SAMPLE RETURN: Exhaust connections must be consistent with
the hazard level of the constituent gases. Check Local, State, and
Federal laws, and ensure that the exhaust stream vents to an
appropriately controlled area if required.
SPAN GAS IN: This is the port for inputting span gas and zero
gas. The span gas source should be regulated at 3 psig.
3.1.3.2 Electrical Connections
All electrical connections for the OT-2 System are made on a
terminal blocks in the transmitter box located on the inside of the
system enclosure, see Figure 3-3.
1. To access the terminal block remove the four screws
securing the transmitter box cover and remove it.
2. Connect the 4 wires and shield to the terminal block as
shown in Figure 3-4.
3. Replace the cover and screws.
For safe connections, ensure that no uninsulated wire extends
outside of the connectors they are attached to. Stripped wire
ends must insert completely into terminal blocks. No uninsulated
wiring should be able to come in contact with fingers, tools or
clothing during normal operation.