Met One Instruments 085 Manuale utente
Page 2 085-9800 Manual Rev A.doc
Met One
Instruments, Inc
1600 Washington Blvd.
Grants Pass, Oregon 97526
Telephone 541-471-7111
Facsimile 541-471-7116
Regional Service
3206 Main St. Suite 106
Rowlett, Texas 75088
Telephone 972-412-4715
Facsimile 972-412-4716
MODEL 085
RELATIVE HUMIDITY /
TEMPERATURE SENSOR
MANUAL
085-9800 Manual Rev A.doc Page 3
Copyright Notice
Model 085 Relative Humidity / Temperature Sensor Manual.
© Copyright 2018 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.
Technical Support
Should you require support, please consult your printed documentation to resolve your
problem. If you are still experiencing difficulty, you may contact a Technical Service
representative during normal business hours—7:30 a.m. to 4:00 p.m. Pacific Standard
Time, Monday through Friday.
Voice: (541) 471-7111
Fax: (541) 471-7116
E-Mail: service@metone.com
Mail: Technical Services Department
Met One Instruments, Inc.
1600 Washington Boulevard
Grants Pass, OR 97526
Page 4 085-9800 Manual Rev A.doc
Safety Notice
The contents of this manual have been checked against the hardware and software
described herein. Since deviations cannot be prevented entirely, we cannot guarantee
full agreement. However, the data in this manual is reviewed regularly and any
necessary corrections included in subsequent editions.
Faultless and safe operation of the product presupposes proper transportation, storage,
and installation as well as careful operation and maintenance. The seller of this
equipment cannot foresee all possible modes of operation in which the user may
attempt to utilize this instrumentation. The user assumes all liability associated with the
use of this instrumentation. The seller further disclaims any responsibility for
consequential damages.
Warranty
Products manufactured by Met One Instruments, Inc. are warranted against defects in
materials and workmanship for a period of (1) year from the date of shipment from the
factory. Offered products not manufactured by Met One Instruments, Inc. will be
warranted to the extent and in the manner warranted by the manufacturer of that
product.
Any product found to be defective during the warranty period will, at the expense of Met
One Instruments, Inc. be replaced or repaired and return freight prepaid. In no case
shall the liability of Met One Instruments, Inc. exceed the purchase price of the product.
This warranty may not apply to products that have been subject to misuse, negligence,
accident, acts of nature or that have or modified other than by Met One Instruments,
Inc. Consumable items such as bearings are not covered under this warranty.
Other than the warranty set forth herein, there shall be no other warranties, whether
expressed, implied or statutory, including warranties of fitness or merchantability.
085-9800 Manual Rev A.doc Page 5
Table of Contents
1.
GENERAL INFORMATION ..................................................................................... 6
1.1.
Description ................................................................................................................................. 6
1.2.
085 Options ............................................................................................................................... 8
1.2.1.
Radiation Shield Compatibility Option: ................................................................................ 8
2.
SENSOR SITING .................................................................................................... 8
3.
INSTALLATION ...................................................................................................... 9
3.1.
Mounting Instructions ................................................................................................................. 9
3.2.
Wiring Instructions ................................................................................................................... 10
4.
OPERATIONAL CHECK-OUT AND CALIBRATION ............................................ 11
4.1.
Relative Humidity Sensor Check-out ....................................................................................... 11
4.2.
Limitations of RH Measurements at Below Freezing Temperatures ....................................... 11
4.3.
Temperature Sensor ................................................................................................................ 12
4.4.
Temperature Table .................................................................................................................. 13
4.4.1.
Temperature to Resistance Table (Celcius) ..................................................................... 13
4.4.2.
Temperature to Resistance Table (Fahrenheit) ................................................................ 14
4.5.
Temperature Sensor Data Logger Connection ........................................................................ 16
4.6.
General Maintenance Schedule .............................................................................................. 17
4.7.
085 Relative Humidity Sensor Maintenance and Calibration ................................................... 17
4.8.
Sensor Maintenance ................................................................................................................ 17
4.8.1.
Sensor Element ................................................................................................................. 17
4.8.2.
Spare Parts ....................................................................................................................... 18
5.
Operational Specifications ................................................................................. 19
Page 6 085-9800 Manual Rev A.doc
1. GENERAL INFORMATION
1.1. Description
The 085 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. The temperature sensor is a two-element composite thermistor type with
linear response over the range of –30°C to +50°C. The sensor is designed to be
mounted in a radiation shield when used outdoors. The exact model number you order
will determine the functions of your sensor. The following section describes the model
number feature assignments.
Figure 1 Model 085-35 Sensor
085-9800 Manual Rev A.doc Page 7
Figure 2 Model 085-6 Sensor
Page 8 085-9800 Manual Rev A.doc
1.2. 085 Options
The 085 options are defined by dash numbers as follows:
085-(Shield Option)
1.2.1. Radiation Shield Compatibility Option:
6 = Use with Model 076B or 077 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.
35 = Use with Model 073B or 5980 radiation shield. This sensor has a circular
connector for use with Met One Instruments cable PN 2348.
2. SENSOR SITING
The EPA recommends sensor mounting in a radiation shield at a 2 meter height, ideally
over green mowed grass to minimize related terrestrial radiation errors on the
temperature and relative humidity readings. Typical installations may vary significantly
from these recommendations due to geographic limitations or specific monitoring
requirements.
085-9800 Manual Rev A.doc Page 9
3. INSTALLATION
If the sensor is to be mounted in a radiation shield, refer to the radiation shield manual
section for mounting details. Typical installations are shown below.
Sensors not installed in a radiation shield should be mounted in a representative
location having good airflow and shaded from sunlight or other heat radiation sources
that would affect measurement of relative humidity or temperature.
3.1. Mounting Instructions
Figure 2 Radiation Shield Installation
Page 10 085-9800 Manual Rev A.doc
3.2. Wiring Instructions
Sensor
Connection
Wire Color Description
Pin A White +10 to +18 VDC
Pin B Green Signal Ground
Pin C Yellow RH Analog Output
Pin D Black Temperature Common
Pin E Red 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).
085-9800 Manual Rev A.doc Page 11
4. OPERATIONAL CHECK-OUT AND CALIBRATION
4.1. Relative Humidity Sensor Check-out
To verify correct wiring and test the basic sensor operation, blow on the sensor. The
moisture in your breath should cause the relative humidity reading to rise.
The relative humidity sensor has been calibrated at the factory. To check for proper
operation of the sensor it is advised that the output signal be checked against a local
weather service facility or a local relative humidity measuring device such as a
psychrometer. Due to normal atmospheric and geographical variations, the local
weather service data should be used only as a guideline. Ambient air relative humidity
can be expected to vary significantly over short distances and in brief periods of time.
4.2. Limitations of RH Measurements at Below Freezing Temperatures
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
(Deg C)
Maximum RH
(%)
0 100
-5 96
-10 92
-15 88
-20 84
-25 80
-30 76
-35 72
-40 68
-45 64
-50 60
Indice
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