In-Situ PXD-461 Operators Manual - Manual (Page 3)

Page 3 of 4
Using the Transducer with Other Equipment
The transducer provides a current output that is proportional to the
applied pressure. This output is a 4-20 mA change corresponding to a
full-scale change in pressure. The voltage required by the transducer
is 11.6–40 (maximum) VDC.
Any data logger that provides the necessary voltage and can read the
4-20 mA current output can be used with the transducer. To insure
accuracy, power should be applied for a minimum of 50 milliseconds
prior to any reading.
Transducer wiring is shown in the table below by cable type.
Mating connectors must be ordered separately from In-Situ, Inc. A kit
with wiring diagrams is available. Do not use any other type of
connector as this will compromise the integrity of waterproof opera-
tion. Also, remember that the vent tube in the cable must remain
unobstructed to assure that the transducer is insensitive to barometric
pressure changes.
Maintenance
Filter
A small mesh filter protects the pressure sensor from dirt and other
foreign objects. It is held in the end of the NPT threads by a small star
washer and can be seen when the nosecone is removed. The filter
appears opaque when clean. If it becomes clogged with silt, try
flushing it gently with a couple of squeezes from a water bottle. If this
doesn’t do the trick, contact Customer Service.
Nose Cone
If the holes in the nose cone become plugged, take the nose cone off
and clean the holes with a swab or brush. To replace the nose cone
on the PXD-261, first put the wavy spring washer over the threads,
then screw on the nose cone hand-tight.
Cable
The transducer’s Quick-Connect cable connector permits easy cable
removal when changing to a different cable, installing the transducer
in a pipe fitting, or storing the probe. Cable is available in standard
and custom lengths of vented polyurethane or FEP*, or non-vented
HDPE.
Take care to protect the cable from the sharp edges of well casings.
All cables are internally sealed to protect the transducer in the event
that the cable is cut. Don’t attempt to repair, splice, or seal any cuts
without first consulting In-Situ Technical Support personnel.
Vent Tube (Vented Cable)
PSIG pressure sensors are designed to be insensitive to barometric
pressure changes. A vent tube in the cable assures that atmospheric
pressure is the reference pressure to the sensor diaphragm. For
proper operation the vent tube should not be bent, kinked, or
blocked. Such obstructions will cause barometric pressure fluctua-
tions to appear in measurements, and may also introduce large,
varying errors due to thermal expansion and contraction of air
within the vent tube and probe body.
Calibration
Accuracy can be adversely affected by improper care and handling,
exceeding operating pressure and temperature limits, physical
damage or abuse. Annual recalibration is recommended.
Contact In-Situ Customer Service for information on recalibration.
Warranty Provisions
In-Situ Inc. warrants the PXD-261 and PXD-461 for one year from date of
purchase by the end user against defects in materials and workmanship
under normal operating conditions. To exercise this warranty contact Techni-
cal Support at the phone or e-mail address below for a return material
authorization (RMA) and instructions. Complete warranty provisions are
posted on our website at www.In-Situ.com.
In-Situ Inc. does not warrant the transducer against dam-
age caused by use with devices not provided by In-Situ.
Source Double Return Double
Cable Source (+) Return (–) Ground Connector (+) Connector (–)
4-conductor Yellow Brown Shield Yellow & Orange Brown & Red
Non-vented (Pin 6) (Pin 5) (Pin 4)
6-conductor Poly Brown Black Shield Black & White Brown & Red
Vented (RuggedCable ™ ) (Pin 6) (Pin 5) (Pin 4)
6-conductor FEP Yellow Black Shield Yellow & Orange Black & Brown
Vented (RuggedCable ™ ) (Pin 6) (Pin 5) (Pin 4)