CSC Product Information

Product Information - HMP45C212

Relative Humidity (0 to 100%) and Air Temperature Probe (YSI 44212 Thermilinear) (-50 to +50°C)

Model	Cable Length
HMP45C212	10 Ft
HMP45C212-L	Custom

Manual

General Description

The Model HMP45C212 probe contains a Vaisala capacitive relative humidity sensor and a YSI 44212 thermistor as per attached documentation in Appendix A. The probe is designed to be housed in the 41003-X 10 Plate Gill Radiation Shield or equivalent, with a R41046DS-24A adaptor plug; a ten foot lead length is standard. Longer lead lengths are available up to 1000 feet. Voltage drop in the longer lead lengths will lower the RH reading by approximately 0.6% RH per 100 feet of cable. Do not extend lead lengths by adding wire to the pigtail (connection) end or measurement errors will result.

Specifications

Accuracy

	Voltage Mode	Resistance Mode
Thermistor Absolute Accuracy and Interchangeability:	±0.1°C	±0.1°C
Linearity (deviation from best straight line):	±0.09°C	±0.09°C
Maximum Uncertainty due to ±0.1% fixed resistors:	±0.15°C @ -50°C ±0.09°C @ 0°C ±0.03°C @ 50°C	±0.15°C @ -50°C ±0.09°C @ 0°C ±0.03°C @ 50°C

Relative Humidity Sensor

Probe length:	25.4 cm (10 in.)
Probe Body Diameter:	2.5 cm (1 in.)
Filter:	0.2 µm Teflon membrane
Filter diameter:	1.9 cm (0.75 in.)
Power consumption:	<4 mA
Supply Voltage (via CSI switching circuit):	7 to 17 VDC
Settling Time:	0.15 seconds
Sensor:	HUMICAP® 180
Relative Humidity Measurement Range:	0 to 100% non-condensing
RH Output Signal Range:	0.008 to 1 VDC
Accuracy at 20°C	±2% RH (0 to 90% Relative Humidity) ±3% RH (90 to 100% Relative Humidity)
Temperature Dependence of Relative Humidity Measurement:	±0.05% RH/°C
Typical Long Term Stability:	Better than 1% RH per year
Response Time (at 20°C, 90% response):	15 seconds with membrane filter
Note: The black outer jacket of the cable is Santoprene® rubber. This compound was chosen for its resistance to temperature extremes, moisture, and UV degradation. However, this jacket will support combustion in air. It is rated as slow burning when tested according to U.L. 94 H.B. and will pass FMVSS302. Local fire codes may preclude its use inside buildings.

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