INSTRUCTION MANUAL
CS445 Liquid Level Sensor
1/04
Copyright (c) 2004
Campbell Scientific, Inc.
The CS445 Pressure Transducer is manufactured by KWK Technologies. KWK’s
conditions of sale and return policy apply to these items.
Products may not be returned without prior authorization. To obtain an RMA number
contact KWK Technologies, Inc., phone (509) 466-5871, www.kwktechnologies.com.
NOTE: if the product has been exposed to hazardous media, it must be fully
decontaminated and neutralized prior to return to KWK.
CS445 Table of Contents
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1. Introduction.................................................................1
2. Specifications .............................................................1
3. Installation...................................................................2
3.1 Initial Inspection and Handling Guidelines...............................................2
3.2 Installation Guidelines..............................................................................3
4. Wiring ..........................................................................3
5. Programming Example...............................................3
5.1 Using ShortCut..........................................................................................4
5.2 Using CRBasic..........................................................................................4
5.3 Using Edlog..............................................................................................5
6. Maintenance................................................................6
6.1 Every Visit, At Least Monthly..................................................................6
6.2 Every Three Months.................................................................................6
6.3 Every Two to Three Years or on a Rotating Schedule..............................6
7. Troubleshooting Hints................................................7
Appendix
A. SDI-12 Transparent Mode......................................A-1
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CS445 Liquid Level Sensor
1. Introduction
This manual describes using the CS445, KWK Technologies’ SPXD-600
submersible pressure transducer with Campbell Scientific’s CR10(X), CR23X,
CR510, CR500 and CR200 series dataloggers. Information provided in the
manual includes datalogger-to-sensor connection, datalogger programming,
and maintenance requirements.
The CS445 Submersible Pressure Transducer is designed to provide reliable,
accurate water pressure/level measurements. This device is intended to
combine the excellent performance of the KWK analog pressure transmitter
with the convenience of the SDI-12 interface and commands. The result is a
device with performance exceeding the requirements of many water level
measurement applications and the simplicity of the three-wire SDI-12
connection scheme.
Combining the sensor, analog measurement and signal processing within a
single housing results in the integration of state-of-the -art senso r and
measurement technology. The 24 Bit A/D converter is auto calibrated prior to
each pressure measurement. A number of additional advanced measurement
techniques are employed to harness the best possible performance available
from today’s state-of-the-art pressure sensor technology. The Transducer
reverts to a low power sleep state between measurements. The auto calibration
and measurement cycle takes approximately 1 second. The CS445 responds to
the initiate measurement command, issued by a datalogger, indicating that 1
value will be ready in a maximum of 2 seconds.
2. Specifications
The CS445 is specified for operation over the 0 – 50°C (32 – 122 °F)
temperature range. Standard pressure ranges include 0 – 5, 15, 30, 50 and 100
PSIG (Vented) as well as 30, 50 and 100 PSIA (Non-Vented).
The design utilizes an isolated silicon strain gauge sensor housed in a 316
Stainless Steel package to enhance reliability. The rugged construction makes
the CS445 suitable for water level measurement in irrigation applications,
water wells, lakes, streams and tanks. The cable incorporates a vent tube to
compensate for atmospheric pressure fluctuations and the jacket is made of
rugged polyurethane, designed to remain flexible and tough, even under harsh
environmental conditions.
Electrical Specifications:
Excitation: 8 – 24 VDC
Operating Current: 0.36 mA quiescent, ~7 mA peak during
wake/measurement cycle
Operating Temperature Range: 0 – 60 °C, Nonfreezing
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