Michell Instruments PCMini52 Operating Manual

PCMini52

Digital RH & Temperature Mini Probe

User’s Manual

97300 Issue 1, March 2012 Michell Instruments

Inside front cover (blank)

PCMini52 User’s Manual

PCMini52

© 2009-2012 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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Contents

Safety .............................................................................................................................................. v

Electrical Safety ......................................................................................................................... v

Toxic Materials .......................................................................................................................... v

Repair and Maintenance............................................................................................................. v

Calibration ................................................................................................................................ v

Safety Conformity ...................................................................................................................... v

Abbreviations ....................................................................................................................................vi

Recycling Policy .................................................................................................................................vi

WEEE And RoHS Compliance ..............................................................................................................vi

Warranty .........................................................................................................................................vii

Return Policy ....................................................................................................................................vii

1 INTRODUCTION ........................................................................................................................ 1

1.1 Features ......................................................................................................................... 1

1.2 Dimensions .................................................................................................................... 1

2 INSTALLATION .......................................................................................................................... 2

2.1 Wall Mounting ................................................................................................................ 2

2.2 Duct Mounting ................................................................................................................ 2

3 CALIBRATION ........................................................................................................................... 3

Figures

Figure 1.1 Dimensions ...........................................................................................................1

Figure 2.1 Wall Mount Position ................................................................................................2

Figure 2.2 Duct Mount Position ...............................................................................................2

Figure 3.1 Cable Connections .................................................................................................3

Appendices

Appendix A Technical Specications ...........................................................................................5

Appendix B List of Worldwide Michell Instruments’ Ofces ........................................................... 7

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PCMini52 User’s Manual

Safety

The manufacturer has designed this equipment to be safe when operated using the procedures detailed in this
manual. The user must not use this equipment for any other purpose than that stated. Do not apply values
greater than the maximum value stated.

This manual contains operating and safety instructions, which must be followed to ensure the safe operation
and to maintain the equipment in a safe condition. The safety instructions are either warnings or cautions
issued to protect the user and the equipment from injury or damage. Use competent personnel using good
engineering practice for all procedures in this Manual.

Electrical Safety

The instrument is designed to be completely safe when used with options and accessories supplied by the
manufacturer for use with the instrument.

Toxic Materials

The use of hazardous materials in the construction of this instrument has been minimized. During normal
operation it is not possible for the user to come into contact with any hazardous substance which might be
employed in the construction of the instrument. Care should, however, be exercised during maintenance and
the disposal of certain parts.

Repair and Maintenance

The instrument must be maintained either by the manufacturer or an accredited service agent. Refer to

Appendix B for details of Michell Instruments’ worldwide ofces contact information.

Calibration

Michell Instruments recommends an annual calibration for an accuracy requirement of ±2% RH under
ambient conditions where temperature is 0 to +50°C (+32 to +122°F) and relative humidity is 0 to 70%
RH. For environments with airborne chemicals or for high humidity and high temperature conditions, Michell
recommends more frequent calibration.

Safety Conformity

This product meets the essential protection requirements of the relevant EU directives. Further details of

applied standards may be found in the product specication.

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Abbreviations

The following abbreviations are used in this Manual:

AC alternating current

°C degrees Celsius

°F degrees Fahrenheit

DC direct current

g Gram(s0

oz ounce(s)

sec second(s)

temp temperature

V Volts

" inch(es)

ø diameter

μ micro

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.

The product that you have purchased may contain recyclable and/or recycled parts and we will be happy to
provide you with information on these components if required.

WEEE And RoHS Compliance

The Waste Electronic and Electrical Equipment (WEEE) Directive, and the Restriction of Hazardous Substances
(RoHS) Directive place rules upon European manufacturers of electrical and electronic equipment. The
directive’s aim is to reduce the impact that electronic devices have on the environment.

Michell products are currently exempt from the RoHS directive, however all future products will be developed
entirely using compliant materials. Furthermore, Michell is taking active steps to remove non-compliant
materials and components from existing products wherever possible.

Michell is in full compliance with the WEEE Directive (Registration No. WEE/JB0235YW). Customers may be
required to return certain instruments for treatment at the end of their working life.

June 2010

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PCMini52 User’s Manual

Warranty

Unless otherwise agreed, the Supplier warrants that, as from the date of delivery for a period of 12 months,
the goods and all their component parts, where applicable, are free from any defects in design, workmanship,
construction or materials.

The Supplier warrants that the services undertaken shall be performed using reasonable skill and care, and of
a quality conforming to generally accepted industry standards and practices.

Except as expressly stated all warranties, whether express or implied, by operation of law or otherwise, are
hereby excluded in relation to the goods and services to be provided by the Supplier.

All warranty services are provided on a return to base basis. Any transportation costs for the return of a
warranty claim shall reside with the Customer.

Return Policy

If a Michell Instruments’ product malfunctions within the warranty period, the following procedure must be
completed:

1. Notify a Michell Instruments’ representative, giving full details of the problem,
the model variant and the serial number of the product.

2. If the nature of the problem indicates the need for factory service then the
instrument should be returned to Michell Instruments, carriage prepaid,
preferably in the original packaging, with a full description of the fault
and the customer contact information.

3. Upon receipt, Michell Instruments will evaluate the product to determine the
cause of the malfunction. Then, one of the following courses of action will
be taken:

• If the fault is covered under the terms of the warranty, the

instrument will be repaired at no cost to the owner and returned.

• If Michell Instruments determines that the fault is not covered

under the terms of the warranty, or if the warranty has expired,
an estimate for the cost of the repairs, at standard rates, will be
provided. Upon receipt of the owner’s approval to proceed, the
product will be repaired and returned.

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1 INTRODUCTION

The micro-processor control and multi-point calibration give the PCMini52 RH probe excellent performance in
terms of accuracy and linearity. The mini probe can provide two linear analog outputs for temperature and
relative humidity, dew point, absolute humidity or wet bulb temperature.

1.1 Features

• Output can be % RH, calculated absolute humidity, dew point or wet bulb
temperature + temperature

• Excellent linearity, (μP) micro-processor temperature compensated

• Low power consumption, fast settling time

• Small size: L = 80mm, ø12mm (3.15”, ø0.47”)

1.2 Dimensions



80mm

(3.15”)



11mm

(0.43”)

Ø12mm

(0.47”)



12.5mm
(0.49”)















M8 x 1

M12 x 1

Figure 1.1 Dimensions

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2 INSTALLATION

2.1 Wall Mounting

The PCMini52 can be used for wall mounting and must always be installed with the sensing element facing
downwards so as to minimize the propagation of heat between the transmitter and the sensitive element. It
should be attached to the wall with a mounting clip.

Figure 2.1 Wall Mount Position

2.2 Duct Mounting

The PCMini52 can be used for duct mounting and must be installed so that the end of the sensor body (the

lter) comes into contact, perpendicularly, with the ow of air from which the relative humidity is to be

measured.

An extra opening should be made in the air duct close to the opening for the installation of the sensor in order
that checks and further calibration may be performed, when required.

If necessary, an appropriate form of thermal insulation should be placed between the walls of the duct and
the transmitter housing.



DUCT

Figure 2.2 Duct Mount Position

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3 CALIBRATION

The transmitter is calibrated at two points.

Cable color

Brown Supply voltage V +

White Output RH, Dew Point or Absolute Humidity

Black Output temperature

Blue Common ground

PCMini52 User’s Manual

GND

OUTPUT TEMP OUTPUT RH

+ SUPPLY (8 - 35 V DC)

Figure 3.1 Cable Connections

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Appendix A

Technical Specications

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PCMini52 User’s Manual

Appendix A Technical Specications

Performance

Measurement range (RH) 0–100% RH

Measurement range (T) -20 to +80°C (-4 to +176°F)

Accuracy at 23°C (73°F)

Humidity

Accuracy at 23°C (73°F)
Temperature

Stability – RH Sensor ±1% RH/year

Response time – RH Sensor <10 sec typical (for 90% of the step change)

<±2% RH (10–90% RH)

±0.2°C (±0.36°F)

Electrical output/input

Output signal options 0–1, 0–5, 0–10 V

Supply voltage 14–35 V DC (for 0–5 / 10 V output)

4.5–35 V DC (for 0–1 V output)
or 14–26 V AC (for all output ranges)

Operating conditions

Operating temperature
Sensing element
Housing
Storage

-30 to +85°C (-22 to +185°F)

-30 to +85°C (-22 to +185°F)

-40 to +85°C (-40 to +185°F)

Mechanical specication

Ingress protection IP65 (NEMA 4 level)

Housing material Molded polymer or stainless steel (ordering option)

Dimensions L=80mm, ø12mm (L=3.15”, ø0.47”)

Weight 10g (0.35oz)

Electrical connections 4 pin, M8 connector

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Appendix B

List of Worldwide Michell

Instruments’ Ofces

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PCMini52 User’s Manual

Appendix B List of Worldwide Michell Instruments’ Ofces

Asia

Michell Asia
PO Box 3149
Joondalup
WA 6027
Australia
Tel: [phone]
E-mail: [e-mail]
Web: www.michell.com/au

China

Michell Instruments (Shanghai) Ltd
Room 1007, Qilai Building
889 Yishan Road
Shanghai, 200233
P R China
Tel: [phone]
Fax: [phone]
E-mail:

[e-mail]

Web: www.michell.com/cn

Germany, Austria, Switzerland

Michell Instruments GmbH
Industriestrasse 27
D-61381 Friedrichsdorf
Germany
Tel: [phone]
Fax: [phone]
E-mail:

[e-mail]

Web: www.michell.com/de

Benelux

Michell Instruments Benelux BV
Krombraak 11
4906 CR Oosterhout
The Netherlands
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Web:

www.michell.com/nl

France

Michell Instruments SAS
2-4, rue Jean Desparmet
69008 Lyon
France
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.michell.com/fr

Italy

Michell Italia Srl
Via Capecelatro, 10
20148 Milano
Italy
Tel: [phone]
Fax: + 39 02 40010565
E-mail: [e-mail]
Web: www.michell.com/it

Japan

Michell Japan KK
Musashino Center Building
1-19-18 Nakacho, Musashino
Tokyo 180-0006
Japan
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.michell-japan.co.jp

North America

Michell Instruments Inc
319 Newburyport Turnpike, Suite 207
Rowley, MA 01969
USA
Tel: [phone]
Fax: [phone]
E-mail:

[e-mail]

Web: www.michell.com/us

Middle East

Michell Instruments Middle East
P-06, #097
Sharjah Airport Int’l free zone
Sharjah,
United Arab Emirates
Tel: [phone]

[phone]

Fax:
E-mail: [e-mail]

United Kingdom

Michell Instruments Ltd
48 Lancaster Way Business Park
Ely, CB6 3NW
Cambridgeshire
England
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.michell.com/uk

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NOTES:

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http://www.michell.com