Michell Instruments DT722 Manuale utente
DT722
Duct Mount
RH & Temperature Transmitter
User’s Manual
97332 Issue 2
January 2018
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© 2018 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.
DT722
For Michell Instruments' contact information please go to
www.michell.com
DT722 User’s Manual
iv 97332 Issue 2, January 2018
Contents
Safety ................................................................................................................................ v
Electrical Safety ........................................................................................................... v
Toxic Materials ............................................................................................................. v
Repair and Maintenance ............................................................................................... v
Calibration................................................................................................................... v
Safety Conformity ........................................................................................................ v
Abbreviations......................................................................................................................vi
Warnings ............................................................................................................................vi
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Electrical Connections ......................................................................................... 2
3 CALIBRATION AND ADJUSTMENT PROCEDURE....................................................3
3.1 Calibration and Adjustment ................................................................................. 3
Figures
Figure 1 DT722 .......................................................................................................1
Figure 2 Electrical Connections .................................................................................2
Figure 3 Connections ...............................................................................................3
Figure 4 Dimensions ................................................................................................6
Figure 5 Template ...................................................................................................7
Appendices
Appendix A Technical Specifications................................................................................5
Appendix B Quality, Recycling & Warranty Information.....................................................9
Appendix C Return Document & Decontamination Declaration........................................ 11
Appendix D Recommended Practices in Humidity Measurements..................................... 13
DT722 User’s Manual
Michell Instruments v
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 instruments are 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 instruments must be maintained either by the manufacturer or an accredited service agent.
Refer to www.michell.com for details of Michell Instruments’ worldwide offices 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, more frequent calibration is recommended.
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 specification.
DT722 User’s Manual
vi 97332 Issue 2, January 2018
INTRODUCTION
Abbreviations
The following abbreviations are used in this manual:
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
g gram(s)
“ inch(es)
lb pound(s)
mA milliampere
mm millimeters
% percentage
oz ounce(s)
RH relative humidity
T temperature
V Volts
Warnings
The following general warning listed below is applicable to this instrument. It is repeated
in the text in the appropriate locations.
Where this hazard warning symbol appears in the following
sections it is used to indicate areas where potentially
hazardous operations need to be carried out.
DT722 User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The DT722 is a rugged, industrial, relative humidity and temperature transmitter
designed for process applications where accurate, stable measurement and control of
humidity and temperature is required.
Figure 1
DT722
1.1 Features
• Designed for accurate measurement in a harsh environment
• Can withstand temperatures up to 150°C (300°F)
• Stainless steel housing
• Calculated moisture signal output - optional
• Integral loop powered display – optional
• 0 to 100% RH / -40 to +150°C operating ranges
• Long term stability: ±1% RH over 12 months
• M12 fast connector
DT722 User’s Manual
297332 Issue 2, January 2018
INSTALLATION
2 INSTALLATION
2.1 Electrical Connections
Connections
Cable Pin
White Pin 1 SUPPLY + 8 to 32 V DC
Yellow Pin 2 Output 2 = Temp 4-20 mA (max 500 Ω)
Brown Pin 3 DO NOT CONNECT! (for calibration only)
Green Pin 4 Output 1 = RH 4-20 mA (max 500 Ω)
Pin 5 DO NOT CONNECT! (for calibration only)
NOTE: Even though the DT722 has a 5 pin connector, the standard
connection cable (A000031) has only 4 pins/wires.
However, only 3 pins (1, 2 and 4) are needed to connect the DT722
see
Figure 3
NOTE : Both RH and T need to be connected in order for the T output to
work
1
4
5
2
3
Figure 2
Electrical Connections
DT722 User’s Manual
Michell Instruments 3
CALIBRATION
3 CALIBRATION AND ADJUSTMENT PROCEDURE
• Calibration certifications: In addition to the normal calibration
procedure, each transmitter can be supplied with its own traceable
calibration certificate. Please ask Michell Instruments or your local
distributor for more information.
• Calibration interval time: Under normal ambient conditions (0 to
50°C, 0 to 70% RH) and for accuracy of ±2% RH, an annual calibration
is recommended. For accuracy of ±5% RH a calibration is recommended
every five years. For environments with airborne chemicals or of high
humidity and high temperature conditions more frequent calibration is
recommended.
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. For more information on the S503, S904 or Optical humidity generators
please contact Michell Instruments (see www.michell.com for contact details).
3.1 Calibration and Adjustment
For recalibration and adjustment of the product please contact Michell
Instruments (see www.michell.com for contact details).
CONNECTIONS
CONNECTOR CABLE
PIN 1 WHITE
YELLOW
BROWN
GREEN
PIN 2
PIN 3
PIN 4
PIN 5
SUPPLY + 8 TO 32 V DC
OUTPUT 2 = Temp 4-20 mA (max 500 Ω)
DO NOT CONNECT! (for calibration only)
OUTPUT 1 = RH 4-20 mA (max 500 Ω)
DO NOT CONNECT! (for calibration only)
V + 8 to 32 V DC
WHITE
GREEN
YELLOW
722
OUTPUT 1
RH
OUTPUT 2
Temp
Figure 3
Connections
DT722 User’s Manual
497332 Issue 2, January 2018
APPENDIX A
Appendix A
Technical Specifications
Indice
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