United Process Controls, Inc.
Oxyfire-LT Installation/Operation Manual
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P a g e
Both of the sensor output signals, TC and millivolt, are low voltage with no current flow.
Do not physically pull on any of the wires in the terminal head. The wires are delicate and any
extra force can cause them to break or connections to become loose. It is not recommended to
remove the terminal cover.
If required for installation, it is possible to replace the supplied cord grip fitting and grommet
with a ½” conduit fitting. Extreme care should be taken to remove the cable connections and
reconnect them through the conduit fitting.
Sensor cable insulation color
Oxyfire-LT models
WIRE
INSULATION
COLOR
ELECTRICAL CONNECTION
RED (red shield)
SENSOR (+)
BLACK (red
shield)
SENSOR (-)
BLACK (green
shield)
HEATER (+)
WHITE (green
shield)
HEATER (-)
RED
THERMOCOUPLE (-)
YELLOW
THERMOCOUPLE (+)
Connection TIP
: Resistance between the heater wires is approximately 25 ohms. Resistance
between the mV signal wires is a virtual open.
3
REFERENCE AIR
3.1
Clean, Dry Air Supply
The sensor requires a supply of clean, dry air at a flow rate of 50 to 150cc/min. at a pressure of
approximately 2 psi. Sources for the air supply are regulated, clean plant instrument air or atmospheric air
from a small pump.
Each Oxyfire-LT sensor has a reference air inlet and outlet port. If necessary, but not required, the
reference air outlet can be vented to a specified location. The reference air exhaust must not create
back pressure nor can it be plugged.
3.2
Suitable Reference Air Units
Part #F005010 – Reference Air Assembly – Includes regulator, filter, flow meter, and
interconnecting stainless steel tubing and fittings. For use with customer plant instrument air supply.
May be used for multiple sensors.
Part #F005026 – Reference Air Panel – Includes pre-wired and plumbed enclosure with atmospheric
pump and flow meter. For use when plant instrument air is not available. One reference air panel per
sensor. Requires 120 VAC power supplied by customer.
