In-Situ PXD-461 Operators Manual - Manual (Page 2)

Page 2 of 4
Connect to the Data Logger
To connect to In-Situ’s HERMIT data loggers:
1 Remove the protective caps from the logger and cable connectors.
2 Orient the connector patterns so that the large tab
in the cable connector aligns with the V-shaped
notch in the data logger connector.
3 Gently press the connector halves together.
Excessive force should not be required.
4 Tighten the connector’s lock ring to establish a tight connection
and water-resistant seal.
Program the Data Logger
The process of collecting data from the PXD series transducers and
In-Situ’s HERMIT data loggers is referred to as “running a test.” This
has three steps:
• Enter the transducer characteristics into the data logger
• Enter the test conditions into the data logger
• When the logger is programmed and the transducer is in place,
the test can be started
How you carry out these steps depends on the model of data logger
you are using. For specific information, please refer to the data logger
Operator’s Manual.
Installation Guidelines
• For best results, install the transducer about an hour prior to test
setup or data collection. This will insure that the transducer is
stabilized to the water temperature and allow time for the cable to
stretch or relax.
• To conserve battery power, don’t put the transducer any deeper
than necessary for the test.
• The transducer will not read past its designated range. If the range
is exceeded, the displayed value will remain constant.
• To verify operation, raise and lower the transducer and check that
readings are reasonable and showing change before collecting
data.
• Be sure that the transducer is attached securely to the wellhead or
other stationary object and will not slip during operation.
• Don’t set a pressure transducer below the level of the pump in a
pumping well. The pressure transients generated by the pump will
cause false level readings. Large pumps can swallow the trans-
ducer and cause permanent damage to both the transducer and
the pump.
• Keep the vent tube in the cable unobstructed. Avoid kinks in the
cable. Minimum recommended bend radius is one inch.
Piping Installations
With the nosecone removed, the transducer
can be installed in any ¼” NPT threaded
pipe to monitor flow. Always remove the
cable before screwing the transducer body
into the NPT.
To install the transducer in a pipe fitting:
1 If the cable is attached, remove it. To do so, unscrew the locking
sleeve and gently pull the transducer and cable connector apart.
2 Unscrew the nosecone by hand and remove it.
3 Using an open end wrench (7/8" for PXD-261, 5/8” for PXD-461)
and the wrench flats on the transducer body, screw the transducer
onto any ¼" NPT threaded nipple, tee, or elbow.
4 Reattach the cable.
Accuracy of the electronics may be affected by temperature fluctua-
tions. For long-term tests (several weeks), we recommend you insu-
late the transducer to ensure a thermally stable environment.
Proper operation of a transducer depends upon a clean,
dry connection. Be sure the connectors are clean and
dry before installing them.
Apply your wrench to the wrench flats, not to the spanner
holes at the back end of the transducer. Thread sealing
compound or tape may be used if necessary.
Do not submerge the PXD-261 more than two times its range.
Do not submerge the PXD-461 more than 1.5 times its range.
Overpressuring will permanently offset, damage, or destroy
the transducer.
The pressure reading is calculated by In-Situ’s HERMIT data
loggers using the quadratic formula
P = LX 2 + SX + O
where P = Pressure in PSI
X = Normalized* transducer value (0-1)
L = Linearity value from probe data tag
S = Scale value from probe data tag
O = Offset value from probe data tag
*Transducer reading (in milliAmps) minus 4 divided by 16
When replacing the nose cone, first position the o-ring
(PXD-461) or wavy spring washer (PXD-261), if re-
moved, then screw on the nose cone hand-tight.
Large Tab