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