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Summary of Contents for Michell Instruments PC33
- Page 1 PC33 & 52 RH & Temperature Probes User’s Manual 97238 Issue 2 October 2013...
- Page 2 Please fill out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Instrument Code Serial Number Invoice Date Location of Instrument Tag No Instrument Code Serial Number Invoice Date...
- Page 3 PC33 and 52 © 2013 Michell Instruments This document is the property of Michell Instruments Ltd. and may not be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd.
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Page 4: Table Of Contents
PC33 & 52 User’s Manual Contents Safety ..........................v Electrical Safety ......................v Toxic Materials ......................v Repair and Maintenance ....................v Calibration ........................v Safety Conformity ......................v EMC Compatibility ......................v Abbreviations ........................vi Warnings ..........................vi INTRODUCTION ....................1 Highlights ......................1 Features ...................... -
Page 5: Safety
This product meets the essential protection requirements of the relevant EU directives. Further details of applied standards may be found in the product specification. EMC Compatibility The PC33 & 52 relative humidity probes are designed to meet the following European standards: • EN 61326 (1997) + A1 (1998) + A2 (2001) •... -
Page 6: Abbreviations
PC33 & 52 User’s Manual Abbreviations The following abbreviations are used in this manual: °C degrees Celsius °F degrees Fahrenheit direct current milliampere millimeters ounce(s) relative humidity temperature Volts Ω Ohms “ inch(es) percentage Warnings The following general warning listed below is applicable to this instrument. It is repeated in the text in the appropriate locations. -
Page 7: Introduction
PC33 & 52 Figure 1 Highlights • Low cost PC33 with analog output is designed for HVAC applications • PC52 with analog output is designed for accurate measurement in controlled environments •... -
Page 8: Installation
PC33 & 52 User’s Manual INstallatIoN InSTALLATIOn Voltage output Cable Connector White Pin 1 Power Supply V + Yellow Pin 2 Output temperature + brown Pin 3 Common ground Green Pin 4 Output RH + 4-20 mA output 2-wire Cable... -
Page 9: Calibration And Adjustment Procedure
PCb and sensor (see Figure 4 ). For more information on these adjustment tubes please contact Michell Instruments or your local distributor. A humidity generator, (Michell Instruments S503, S904 or Optical), used in combination with a general reference handheld hygrometer, is ideal for a quick and accurate calibration. -
Page 10: Calibration & Adjustment For 3% Accuracy (1Pt Adjustment)
PC33 & 52 User’s Manual CALIBRATION Calibration & Adjustment for 3% Accuracy (1pt Adjustment) PC33 Remove the screw at the side of the connector. Carefully unscrew the sensor protection cap from the head. dO nOT TOUCH THE SEnSOR ELEMEnT (see 3 below) Carefully remove the circuit board from the body by pulling on the threaded end while holding the tube. -
Page 11: Figure 5 Pc33 - 3/4-Wire Connection
PC33 & 52 User’s Manual CALIBRATION 3/4-wire (Volt) CONNECTIONS CABLE CONNECTOR REL HUMIdITY OUTPUT PIN 1 WHITE 0 to 1 V DC PIN 4 GREEN 0 to 5 V DC PIN 2 YELLOW Temp 0 to 10 V DC... -
Page 12: Calibration & Adjustment For 2% Accuracy (2 Pt Adjustment)
PC33 & 52 User’s Manual CALIBRATION Calibration & Adjustment for 2% Accuracy (2 pt Adjustment) PC52 Remove the screw at the side of the connector. Carefully unscrew the sensor protection cap from the head. dO nOT TOUCH THE SEnSOR ELEMEnT... -
Page 13: Figure 7 Pc52 - 3/4-Wire Connection
PC33 & 52 User’s Manual CALIBRATION 3/4-wire (Volt) CONNECTIONS CABLE CONNECTOR REL HUMIdITY OUTPUT PIN 1 WHITE 0 to 1 V DC PIN 4 GREEN 0 to 5 V DC PIN 2 YELLOW 0 to 10 V DC Temp ... - Page 14 PC33 & 52 User’s Manual appendix a Appendix A Technical Specifications 97238 Issue 2, October 2013...
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Page 15: Figure 8 Dimensions
PC33 & 52 User’s Manual appendix a Appendix A Technical Specifications Performance Measurement Range (RH) 0-100% RH Measurement Range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) PC52: <±2% RH (10-90% RH) Humidity PC33: <±3% RH (30-80% RH) Accuracy at 23°C (73°F) - Page 16 PC33 & 52 User’s Manual appendix B Appendix b EC Declaration 97238 Issue 2, October 2013...
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Page 17: Appendix B Ec Declaration
EN61010-1:2010 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use - Part 1: General Requirements Peter Haakma, Managing Director Michell Instruments B.V. Date of Issue: November 2012 Michell Instruments... - Page 18 EN61010-1:2010 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use - Part 1: General Requirements Peter Haakma, Managing Director Michell Instruments B.V. Date of Issue: November 2012 97238 Issue 2, October 2013...
- Page 19 PC33 & 52 User’s Manual appendix C Appendix C Quality, Recycling & Warranty Information Michell Instruments...
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Page 20: Appendix C Quality, Recycling & Warranty Information
Quality, Recycling & Warranty Information Recycling Policy Michell Instruments is concerned with the protection of the environment. It is our commitment to reduce and eliminate from our operations, wherever possible, the use of substances which may be harmful to the environment. Similarly, we are increasingly using recyclable and/or recycled material in our business and products wherever it is practical to do so. -
Page 21: Calibration Facilities
PC33 & 52 User’s Manual appendix C Calibration Facilities Michell Instruments’ calibration facilities are among the most sophisticated in the world and have been recognized for their excellence. Traceability to the National Physical Laboratory (NPL) UK is achieved through our UKAS Accreditation (Number 0179). - Page 22 PC33 & 52 User’s Manual appendix d Appendix D Recommended Practices in Humidity Measurement 97238 Issue 2, October 2013...
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Page 23: Appendix D Recommended Practices In Humidity Measurements
• Follow Michell Instruments’ care instructions for the instrument. Some instruments need routine cleaning or other maintenance. before using any solvent cleaner, check with Michell Instruments that this will not harm the sensor or other materials of construction. • Wherever possible, ensure that hygrometers are calibrated under the conditions of use, i.e. - Page 24 PC33 & 52 User’s Manual appendix d • Cleanliness of the environment will affect different hygrometers in different ways. Dust and airborne droplets should be avoided or filtered out if possible. Contaminants can come from the most surprising sources, ordinary urban pollution, for example.
- Page 25 PC33 & 52 User’s Manual appendix d dew point in general • The measuring environment and all parts of the sampling pathway must be kept above the dew point if condensation is to be avoided. Electrical trace heating or other heating methods should be used if necessary. An excess temperature of 10°C above the dew point is usually a safe margin.
- Page 26 PC33 & 52 User’s Manual appendix d • Clean environments are always best for humidity measurements, but this is especially critical at very low humidity. Even fingerprints harbour water. High purity cleaning agents are recommended: Analytical Reagent (AR) quality solvents for oil-based contaminants, and purified water (distilled or de-ionised) for salts.
- Page 27 PC33 & 52 User’s Manual nOTES Michell Instruments...
- Page 28 http://www.michell.com...
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