Met One Instruments 085A Manual
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Met One Instruments 085A Manual

Relative humidity / temperature sensor
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M
085A
ODEL
R
H
/
ELATIVE
UMIDITY
T
S
EMPERATURE
ENSOR
M
ANUAL
Met One Instruments, Inc
Corporate Sales & Service: 1600 NW Washington Blvd. Grants Pass, OR 97526
Tel (541) 471-7111 Fax (541) 471-7116
www.metone.com
-
www.service@metone.com

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Summary of Contents for Met One Instruments 085A

  • Page 1 085A ODEL ELATIVE UMIDITY EMPERATURE ENSOR ANUAL Met One Instruments, Inc Corporate Sales & Service: 1600 NW Washington Blvd. Grants Pass, OR 97526 Tel (541) 471-7111 Fax (541) 471-7116 www.metone.com www.service@metone.com...
  • Page 2 085A-9800 Rev A Page 2...
  • Page 3 Copyright Notice Model 085A Relative Humidity / Temperature Sensor Manual. © Copyright 2021 Met One Instruments, Inc. All Rights Reserved Worldwide. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any other language in any form by any means without the express written permission of Met One Instruments, Inc.

  • Page 4: Table Of Contents

    Temperature to Resistance Table (Fahrenheit) ............. 13 4.5. Temperature Sensor Data Logger Connection ..............15 4.6. General Maintenance Schedule ..................16 4.7. 085A Relative Humidity Sensor Maintenance and Calibration ..........16 4.8. Sensor Maintenance ......................16 4.8.1. Sensor Element ......................16 4.8.2.

  • Page 5: General Information

    GENERAL INFORMATION 1.1. Description The 085A sensor is an extremely accurate microprocessor controlled relative humidity and temperature sensor. The relative humidity sensor responds to the full range of 0 to 100% humidity. Response is linear with negligible hysteresis or temperature dependence.
  • Page 6 Figure 2 Model 085A-6 Sensor 085A-9800 Rev A Page 6...

  • Page 7: 085A Options

    1.2. 085A Options The 085A options are defined by dash numbers as follows: 085A-__ (Shield Option) 1.2.1. Radiation Shield Compatibility Option: 6 = Use with Model 076B motor aspirated radiation shield. This sensor comes with 8- inch long pigtail wires for connection to the radiation shield junction box. Refer to the radiation shield manual for sensor and cable connections.

  • Page 8: Installation

    ADAPTER AND ATTACH PLATE. BACK OUT ADAPTER PLATE TO ABOUT ½” AND SECURE SHIELD THE SENSOR TO THE MOUNTING ADAPTER BY TIGHTENING THE TWO SET SCREWS WITH SUPPLIED 5/64” ALLEN WRENCH. Figure 2 Radiation Shield Installation 085A-9800 Rev A Page 8...

  • Page 9: Wiring Instructions

    RH Analog Output Pin D Black Temperature Common Pin E Temperature Signal Pin F No Connection No Connection No Connection White/Brown Shield Figure 3 Electrical Connector View looking at connector pins. (Pins are also identified on connector). 085A-9800 Rev A Page 9...

  • Page 10: Operational Check-Out And Calibration

    The sensor’s relative humidity output is referenced to saturated water vapor pressure above liquid water. When the air temperature is below freezing, the sensor’s maximum theoretical measurement range is limited as follows: Air Temperature Maximum RH (Deg C) 085A-9800 Rev A Page 10...

  • Page 11: Temperature Sensor

    085A sensor and a standard temperature sensor (NIST thermometer or RTD). The mass can be used in air or can be partially submerged in ice or an ice bath. The 085A sensor should not be submerged. 085A Sensor...

  • Page 12: Temperature Table

    4.4. Temperature Table 4.4.1. Temperature to Resistance Table (Celsius) Model 085A-X Temperature vs. Sensor Resistance TEMP DEG C RCAL TEMP DEG C RCAL 110236 26155 104464 25436 99187 24739 94344 24064 89882 23409 85760 22775 81939 22159 78388 21561 75079...

  • Page 13: Temperature To Resistance Table (Fahrenheit)

    4.4.2. Temperature to Resistance Table (Fahrenheit) Model 085A-X Temperature vs. Sensor Resistance TEMP DEG F RCAL TEMP DEG F RCAL 110236 34319 106964 33757 103855 33207 100895 32669 98075 32141 95385 31625 92816 31119 90361 30622 88011 30136 85760 29659...
  • Page 14 Model 085A-X Temperature vs. Sensor Resistance TEMP DEG F RCAL TEMP DEG F RCAL 14670 11061 14447 10883 14227 10707 14009 10534 13794 10362 13583 10193 13374 10025 13167 9859 12963 9696 12762 9534 12564 9374 21368 9215 12174 9059...

  • Page 15: Temperature Sensor Data Logger Connection

    This resistor is built into Met One Instruments data loggers configured for this sensor and supplied with the 085A sensor for use with other equipment. Contact Met One Instruments to obtain a replacement resistor. Maximum recommended excitation is 3.2V.

  • Page 16: General Maintenance Schedule

    Sensor Maintenance 4.8.1. Sensor Element The RH sensor element is not user-replaceable (replacement requires sensor recalibration). If the element becomes damaged, please send the 085A sensor to Met One Instruments for repair. Please obtain shipping instructions and a return authorization (RA) number before returning any unit.

  • Page 17: Spare Parts

    4.8.2. Spare Parts 560014 820216 Thermistor 720050 Figure 5 Spare Parts 820216 RH SENSOR ELEMENT (Requires factory calibration) 560014 FILTER, MEMBRANE 720050 O-RING (Two required) 085A-9800 Rev A Page 17...

  • Page 18: Operational Specifications

    0 to 1 VDC Standard 0 to 5.0 VDC Optional AutoMet Auto ID: General: Input Power 10 to 18 VDC @ < 5 mA Dimensions Length: 8.5 inches (21.59 cm) Diameter: 0.75 inches (1.91 cm) 085A-9800 Rev A Page 18...

This manual is also suitable for:

085a-35085a-6

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