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Met One Instruments 085A, Manual

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Met One Instruments 085A Manual Download Page 18

085A-9800 Rev A 

Page 18 

5. 

Operational Specifications 

 

Model Number:

  

 

085A 

 
Relative Humidity 

RH Sensing Element: 

 

Thin film polymer capacitor  

Range: 

 

0 to 100% RH 

Accuracy: 

± 2.0% from 0 to100% RH 

Response Time: 

10 sec. with 2 m/s aspiration 

 

Temperature: 

Temperature Sensor: 

 

Thermistor 

Temperature Operation Range:  -30° C to +50° C (-22° F to 122° F) 
Temperature Coefficient:   

Compensated internally 

Accuracy 

 

±0.15° C (0.27° F) 

Output: 

 

 

 

Resistive 

 

Analog Output:

 

 

0 to 1 VDC Standard 
0 to 5.0 VDC Optional 

 

 

AutoMet Auto ID:

   

 

No 

 

General: 

Input Power 

 

10 to 18 VDC @ < 5 mA 

Dimensions 

 

Length: 8.5 inches (21.59 cm) 

 

 

Diameter: 0.75 inches (1.91 cm) 

 

 

Summary of Contents for 085A

Page 1: ...nstruments 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 MODEL 085A RELATIVE HUMIDITY TEMPERATURE SENSOR MANUAL ...

Page 2: ...085A 9800 Rev A Page 2 ...

Page 3: ...e 541 471 7111 Fax 541 471 7116 E Mail service metone com Mail Technical Services Department Met One Instruments Inc 1600 NW Washington Blvd Grants Pass OR 97526 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 re...

Page 4: ...dity Sensor Check out 10 4 2 Limitations of RH Measurements at Below Freezing Temperatures 10 4 3 Temperature Sensor 11 4 4 Temperature Table 12 4 4 1 Temperature to Resistance Table Celcius 12 4 4 2 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 ...

Page 5: ...y 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 feat...

Page 6: ...085A 9800 Rev A Page 6 Figure 2 Model 085A 6 Sensor ...

Page 7: ...ld manual for sensor and cable connections 35 Use with Model 074 naturally aspirated 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 ...

Page 8: ...f relative humidity or temperature 3 1 Mounting Instructions Figure 2 Radiation Shield Installation SENSOR WIRE CONNECTIONS IN J BOX TERMINAL WIRE 7 GRN 8 YEL ORG 9 WHT REMOVE CLIPS FROM INNER TUBE USING LONG NEEDLE NOSE PLIERS PLACE SENSOR IN CLIPS AND REINSTALL PUSH SENSOR INTO INNER TUBE AS DEEP AS POSSIBLE WITHOUT TOUCHING BOTTOM PLATE INSTALL SENSOR INTO TRIANGULAR MOUNTING ADAPTER AND ATTACH...

Page 9: ...0 to 18 VDC Pin B Green Signal Ground Pin C Yellow or Orange 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 ...

Page 10: ...tive 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 r...

Page 11: ...472 Thermal Mass to assure that both instruments are at the same temperature This is an aluminum mass with drilled recesses for the 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 Figure 4 5472 Thermal Mass 5472 Thermal Mass 085A Sensor Reference Standard ...

Page 12: ...8311 16 59157 24 17820 15 57014 25 17342 14 54986 26 16876 13 53064 27 16421 12 51240 28 15979 11 49506 29 15547 10 47856 30 15126 9 46284 31 14715 8 44785 32 14314 7 43353 33 13923 6 41985 34 13541 5 40675 35 13167 4 39421 36 12802 3 38218 37 12446 2 37065 38 12097 1 35957 39 11756 0 34892 40 11423 1 33868 41 11097 2 32883 42 10777 3 31934 43 10465 4 31019 44 10159 5 30136 45 9859 6 29284 46 9566...

Page 13: ...78 50 26155 4 69094 51 25753 3 67565 52 25357 2 66088 53 24969 1 64661 54 24587 0 63281 55 24212 1 61946 56 23843 2 60654 57 23481 3 59402 58 23125 4 58190 59 22775 5 57014 60 22430 6 55874 61 22091 7 54768 62 21758 8 53694 63 21430 9 52651 64 21108 10 51637 65 20790 11 50652 66 20478 12 49695 67 20170 13 48763 68 19868 14 47856 69 19570 15 46974 70 19276 16 46114 71 18987 17 45277 72 18703 18 444...

Page 14: ...3583 111 10193 94 13374 112 10025 95 13167 113 9859 96 12963 114 9696 97 12762 115 9534 98 12564 116 9374 99 21368 117 9215 100 12174 118 9059 101 11983 119 8904 102 11794 120 8751 103 11607 121 8600 104 11423 122 8450 105 11241 VALUE WITH 18 7K RESISTOR IN PARALLEL WITH SENSOR RANGE 22 F TO 122 F THERMISTOR BEAD 44203 Tc R 18700 18700 R 12175 127 096 Rt 127 096 Tc 12175 18700 127 096 Tc 12175 187...

Page 15: ...nt resistor Maximum recommended excitation is 3 2V Higher excitation voltage will cause self heating of the thermistors and result in temperature measurement errors Reference Voltage 30 0 C 50 0 C 1 000 0 855 VDC 0 311 VDC 2 000 1 710 VDC 0 622 VDC 2 500 2 137 VDC 0 778 VDC 5 000 DO NOT USE Signal Voltage vs Temperature for Various Excitation Voltages Data Logger Connection R1 23100 0 1 YELLOW or ...

Page 16: ... 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 ...

Page 17: ...085A 9800 Rev A Page 17 4 8 2 Spare Parts Figure 5 Spare Parts 820216 RH SENSOR ELEMENT Requires factory calibration 560014 FILTER MEMBRANE 720050 O RING Two required 560014 Thermistor 820216 720050 ...

Page 18: ...me 10 sec with 2 m s aspiration Temperature Temperature Sensor Thermistor Temperature Operation Range 30 C to 50 C 22 F to 122 F Temperature Coefficient Compensated internally Accuracy 0 15 C 0 27 F Output Resistive Analog Output 0 to 1 VDC Standard 0 to 5 0 VDC Optional AutoMet Auto ID No General Input Power 10 to 18 VDC 5 mA Dimensions Length 8 5 inches 21 59 cm Diameter 0 75 inches 1 91 cm ...

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