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This equipment should be installed, maintained, and operated by technically qualified personnel. Any errors
or omissions in data, or the interpretation of data, are not the responsibility of Durham Geo-Enterprises Inc.
The information herein is subject to change without notification.
This document contains information that is proprietary to Durham Geo-Enterprises Inc., and is subject to
return upon request. It is transmitted for the sole purpose of aiding the transaction of business between
Durham Geo-Enterprises Inc., and the recipient. All information, data, designs, and drawings contained
herein are propri-etary to and the property of Durham Geo-Enterprises Inc., and may not be reproduced or
copied in any form, by photocopy or any other means, including disclosure to outside parties, directly or
indirectly, without permission in writing from Durham Geo-Enterprises Inc.
DGSI
4561 Greer Circle, Suite 100
Tucker, Georgia 30083
Tel: 770-465-7557
Website: www.durhamgeo.com
VW
Temperature Sensor
52631599
Copyright ©2023 Durham Geo-Enterprises, Inc.. All Rights Reserved.
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Summary of Contents for DGSI 52631599
- Page 1 Temperature Sensor 52631599 Copyright ©2023 Durham Geo-Enterprises, Inc.. All Rights Reserved. This equipment should be installed, maintained, and operated by technically qualified personnel. Any errors or omissions in data, or the interpretation of data, are not the responsibility of Durham Geo-Enterprises Inc.
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Page 2: Table Of Contents
Contents Introduction ..... . . 1 Installation Suggestions ... . 2 Taking Readings. -
Page 3: Introduction
Introduction Applications The VW temperature sensor is used to monitor the heat of hydration in mass concrete. Operation The VW temperature sensor consists of a stainless steel body, a wire held in tension within the body, an electromagnetic coil, and signal cable. -
Page 4: Installation Suggestions
Installation Suggestions Sensor Handle the sensor carefully. Never let vibrators make contact with the sensor or the cable. When a temperature sensor is mounted in a particularly vulnerable position, consider spraying the area with marker paint, covering the gauge with a protective wire mesh, or placing some non-structural steel to protect the gauge. -
Page 5: Taking Readings
Taking Readings Reading with Instructions for reading VW sensors with a Campbell Scientific CR10 Data Loggers can be found at www.slopeindicator.com. Go to Support - Tech Notes and click on the link titled “CR10-VW Sensors. ” The VW MiniLogger accepts the same connections as the VW Data Recorder. - Page 6 Reading with the The DataMate MP allows you to choose engineering units for your DataMate MP readings. However, for ease of data reduction, we recommend that you record readings in Hz. See the DataMate MP manual for directions on programming. Manual Mode Connect the DataMate to the sensor (see connection table below).
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Page 7: Data Reduction
Data Reduction Serial Numbers & Each VW sensor has a unique calibration. Use the sensor serial number Calibration Records to match the sensor with its calibration record. There are two alternate data reduction methods; be sure to match the sensor to the method. METHOD A - Five factors Calibration Factors The calibration record lists coefficients that are used in a polynomial... - Page 8 Data Reduction METHOD B - Three factors Calibration Factors The calibration record lists coefficients that are used in a polynomial expression to linearize the Hz readings and convert them to engineering units. The VW temperature sensor lists three factors, A, B, C which are used to convert the Hz reading to degrees C.
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Page 9: Diagnostics
Diagnostics Introduction Perform the tests below to check the sensor and cable. Set your handheld multimeter to a low-ohm range (5k ohm). No Reading Measure the resistance between the two VW wires (orange and white-and-orange). A normal reading should be about 300 ohms. If the reading is very high or infinite, the coil is damaged (or the cable is severed).