In-Situ PXD-461 Operators Manual - Manual

Instruction Sheet
Page 1 of 4
Calibration Documentation
Documents provided with the transducer describe In-Situ’s calibra-
tion process and list the transducer’s calibration coefficients (Linear-
ity, Scale, and Offset), which are also printed on the backshell dust cap.
Installation
Installation requires four steps, which may be performed in any
convenient order:
• Attach the cable
• Connect the cable to the data logger
• Install the transducer in the water
• Program the data logger to identify the transducer
Attach the Cable
1 Remove the protective caps from the backshell and the Quick-
Connect connector on the cable.
2 Slide back the sleeve of the Quick-Connect connector.
3 Align the tab in the transducer backshell with the slot inside the
cable connector.
4 Slide the two parts together and press tightly. They should slip
together easily, without forcing.
5 Tighten the locking sleeve hand-tight.
Pressure Transducers: PXD-261 & PXD-461
The only removable parts of the transducer are the nose cone
and cable. Do not take the body apart, as this may severely
damage the transducer and will void the warranty.
In-Situ’s PXD-261 and PXD-461 are fully submersible pressure
transducers for monitoring pressure or water level. They can be used
with In-Situ’s HERMIT
® data loggers to collect fast, accurate time-
drawdown data from pump and slug tests. Small diameter permits
access to 1" wells. Removable nosecone and NPT threading allows
use in piping or conduit. Quick-Connect cable is easy to install, and
long cable lengths do not compromise accuracy.
Your transducer was carefully inspected before shipping and is ready
to operate out of the box. Check for any physical damage during
shipment. Notify In-Situ and file a claim with the carrier if there is
any such damage. If your transducer didn’t come as ordered, please
contact In-Situ immediately.
Operating Principle
A pressure transducer senses changes in pressure, measured in
pounds per square inch (PSI), exerted by a column of water or other
fluid above an internal strain gauge. This is translated electronically
to a 4-20 mA signal sent to a data logger. Software calibration coeffi-
cients unique to each transducer enable the logger to convert the 4-
20 mA output to meaningful results in the desired units.
PSIA and PSIG
PSIA stands for “pounds per square inch absolute,” measured with
respect to zero pressure. PSIA transducers measure all pressure forces
detected by the strain gauge, including atmospheric pressure.
PSIG stands for “pounds per square inch gauge,” measured with
respect to atmospheric pressure. PSIG transducers thus exclude the
atmospheric pressure component.
This difference may be represented by a simple equation:
P
gauge
= P
abs
- P
atmos
Don’t discard the caps. Set them aside for later use to
protect the contacts when the probe and cable are not in
use, and for convenient reference to the coefficients.
Quick-Connect
cable connector
Cable Stainless steel nose cone,
removable for cleaning or for
installation using NPT threads
Backshell
Protective dust cap lists calibration coefficients
Stainless steel body, engraved
with model & serial number PXD Pressure Transducers
(PXD-461 shown)