Met One Instruments 083E User manual

083E-9800 Rev C
Met One Instruments, Inc
Corporate Sales & Service: 1600 NW Washington Blvd. Grants Pass, OR 97526
Tel [phone] Fax [phone]
www.metone.com - [e-mail]
MODEL 083E
RELATIVE HUMIDITY /
TEMPERATURE SENSOR MANUAL

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Copyright Notice
Model 083E Relative Humidity / Temperature Sensor Manual.
© Copyright 2016 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 or our website
www.metone.com to resolve your problem. If you are still experiencing difficulty, you
may contact a Technical Service representative during normal business hours;
Monday –Friday 7:00 a.m. to 4:00 p.m. Pacific Time.
Voice: [phone]
Fax: [phone]
E-Mail: [e-mail]
Mail: Technical Services Department
Met One Instruments, Inc.
1600 NW Washington Blvd.
Grants Pass, OR 97526

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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.

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Table of Contents
1. GENERAL INFORMATION..................................................................................... 6
1.1. Description.................................................................................................................................6
1.2. 083E Options.............................................................................................................................8
1.2.1. Temperature Option:...........................................................................................................8
1.2.2. 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
4.5.Temperature Sensor Data Logger Connection........................................................................14
4.6. General Maintenance Schedule ..............................................................................................15
4.7. 083E Relative Humidity Sensor Maintenance and Calibration................................................15
4.8. Sensor Maintenance................................................................................................................15
4.8.1. Sensor Element.................................................................................................................15
4.8.2. Spare Parts .......................................................................................................................16
5. Operational Specifications................................................................................. 17

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1. GENERAL INFORMATION
1.1. Description
The 083E 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. Some models contain a high accuracy linearized temperature sensor.
The temperature sensor is a three-element composite thermistor type with linear
response over the range of –50°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 083E-X-35 Sensor

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Figure 2 Model 083E-X-6 Sensor

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1.2. 083E Options
The 083E options are defined by dash numbers as follows:
083E-(Temp Option)-(Shield Option)
1.2.1. Temperature Option:
0 = RH (0 to 100%) only
1 = RH (0 to 100%) & Temperature (–50°C to +50°C)
1.2.2. 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.

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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

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3.2. Wiring Instructions
Sensor
Connection
Wire Color
Description
Pin A
White
+10 to +18 VDC
Pin B
Green
Signal Ground
Pin C
Yellow or Orange
RH Analog Output
Pin D
Black
Temperature Common (Model 083E-1)
No Connection (Model 083E-0)
Pin E
Red
Temperature Signal (Model 083E-1)
No Connection (Model 083E-0)
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).

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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

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4.3. Temperature Sensor
Compare readings with a precision NIST-traceable temperature sensor. Calibration
verification should be performed using a Met One Instruments Model 5472 Thermal
Mass to assure that both instruments are at the same temperature. This is an
aluminum mass with drilled recesses for the 083E 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 083E sensor should not be submerged.
Figure 4 5472 Thermal Mass
5472 Thermal
Mass
083E
Sensor
Reference
Standard

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4.4. Temperature Table
Model 083E-1-X Temperature vs. Sensor Resistance
Temp ( ° C)
RCAL (Ω Ohms)
Temp ( ° C)
RCAL (Ω Ohms)
Temp ( ° C)
RCAL (Ω
Ohms)
-50
158181
-16
49648
18
22404
-49
150561
-15
48389
19
21908
-48
143555
-14
47173
20
21423
-47
137093
-13
45997
21
20949
-46
131114
-12
44861
22
20484
-45
125564
-11
43761
23
20029
-44
120400
-10
42696
24
19583
-43
115583
-9
41665
25
19147
-42
111079
-8
40665
26
18719
-41
106858
-7
39696
27
18300
-40
102895
-6
38755
28
17889
-39
99166
-5
37843
29
17487
-38
95651
-4
36957
30
17092
-37
92333
-3
36097
31
16705
-36
89196
-2
35260
32
16325
-35
86224
-1
34447
33
15952
-34
83406
0
33657
34
15586
-33
80729
1
32888
35
15227
-32
78183
2
32139
36
14875
-31
75760
3
31410
37
14529
-30
73449
4
30700
38
14190
-29
71245
5
30009
39
13856
-28
69138
6
29335
40
13528
-27
67124
7
28677
41
13206
-26
65195
8
28037
42
12890
-25
63348
9
27411
43
12579
-24
61576
10
26801
44
12274
-23
59875
11
26206
45
11974
-22
58242
12
25624
46
11678
-21
56671
13
25056
47
11388
-20
55160
14
24501
48
11102
-19
53705
15
23959
49
10822
-18
52303
16
23429
50
10545
-17
50952
17
22911
RANGE -50 °C - + 50°C (-58°F to +122°F)
YSI THERMISTOR BEAD 44212
Tc = ((((Rt ‾1) + (23100 ‾1)) ‾1) –13698.3) ∕ ‾129.163
Rt = ((((‾129.163 Tc) + 13698.3) ‾1) –23100 ‾1) ‾1
Where:Tc = Temperature in °C
Rt = Sensor Resistance in ΩOhms

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4.5. Temperature Sensor Data Logger Connection
The voltage across the sensor is linear with temperature when a precision 23100
0.1% resistor (Met One Instruments part number 805030) is connected in series with
excitation voltage. This resistor is provided as part of all Met One Instruments
translators designed for use with this sensor, and is included with Met One Instruments
data loggers configured for this sensor. For applications with other equipment, contact
Met One Instruments to obtain this special resistor. Maximum recommended excitation
is 3.2V. Higher excitation voltage will cause self-heating of the thermistors, and
resultant temperature measurement errors.
Reference Voltage
-50.0 °C
+50.0 °C
1.000
0.872 VDC
0.313 VDC
2.000
1.744 VDC
0.625 VDC
2.500
2.180 VDC
0.7825 VDC
5.000 (DO NOT USE)
Signal Voltage vs. Temperature for Various Excitation Voltages
Data Logger Connection
R1
23100 0.1%
YELLOW or ORANGE RH OUTPUT
TO DATA LOGGER SIGNAL INPUT
083E CONNECTOR
F
E
D
C
A
B
BLACK TEMPERATURE COMMON (CONNECT TO SIGNAL GROUND)
REFERENCE VOLTAGE
RED TEMPERATURE SIGNAL OUTPUT (CONNECT TO SUPPLIED NETWORK RESISTOR)
GREEN GROUND
WHITE + 10 TO 18 VDC

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MAINTENANCE AND TROUBLE SHOOTING
4.6. General Maintenance Schedule
6 –12 Month Intervals:
Inspect the sensor for proper operation per Section 4.0.
12 Month Interval:
Return the sensor to Met One Instruments for calibration.
Replace the two 720050 O-Rings.
Replace the 860014 Filter Membrane.
4.7. 083E Relative Humidity Sensor Maintenance and Calibration
WARNING: The sensor can be incorrectly calibrated or permanently damaged through
improper acts. Do not attempt a repair or calibration if you are unsure of the procedure.
Do not touch the sensor element if you do not know the correct procedure.
The instrument should operate for an extended period of time with a minimum of care or
maintenance.
The sensor should be re-calibrated every 12 months.
If parts or maintenance assistance are required, contact Met One Instruments. Obtain
shipping instructions and a return authorization (RA) before returning any unit.
4.8. 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 083E sensor to Met
One Instruments for repair. Please obtain shipping instructions and a return
authorization (RA) number before returning any unit.
Met One Instruments manufactures an RH Calibration Kit part number 10233 which can
be purchased to perform a calibration after the sensor element is replaced. Please
contact the Met One Service Department to purchase the calibration kit.

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4.8.2. Spare Parts
Figure 5 Spare Parts
820202 RH SENSOR ELEMENT (Requires factory calibration)
560014 FILTER, MEMBRANE
720050 O-RING (Two required)
560014
Thermistor
Sensor
820202
720050

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5. Operational Specifications
Relative Humidity
Model Number: 083E
RH Sensing Element: Thin film polymer capacitor
Range: 0 to 100% RH
Temperature Operation Range: -50° C to +50° C (-58° F to 122° F)
Response Time: 10 sec. with 2 m/s aspiration
Accuracy: ± 2.0% from 0 to100% RH
Temperature Coefficient: Compensated internally
Output: 0 to 1 VDC Standard
0 to 5.0 VDC Optional
AutoMet Auto ID: No
Temperature
Temperature Sensor: Thermistor
Temperature Range: -50° C to +50° C (-58° F to 122° F)
Accuracy ±0.10° C (0.18° F)
Output: Resistive
AutoMet Auto ID: No
General
Input Power 10 to 18 VDC @ < 5 mA
Dimensions Length: 8.5 in (21.59 cm)
Diameter: 0.75 in (1.91 cm)