Geonica SA

- Model STH-S331 - Relative Humidity and Air Temperature Sensor

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The STH-S331 model Temperature and Relative Humidity probe is a combined measuring instrument that allows monitoring both parameters with a single mechanical assembly. The STH-S331 is a completely new type of probe that is in a class of its own in terms of accuracy and performance. The STH-S331 temperature and relative humidity sensor is normally connected to METEODATA/HYDRODATA 2000/3000 data acquisition systems. The two sensing elements (Temperature and Relative Humidity) come up bound to a nylon plastic casing, which, on the one hand, allows an easy installation thanks to its direct coupling to solar radiation shields both with natural and forced cooling and, on the other hand, makes easier the connection to the measuring and/or acquisition system using a single 7-pin IP66 connector.

  • General information
    • Provided parameters : Temperature and Relative Humidity
  • Power supply
    • VCC : 3.2 - 5.5 VDC ±0%
    • Vref : 2.5 V ±1mV
  • Power consumption : Nominal : 7.7 mA @ 5 VDC
  • Protection
    • Grade : IP65 / IP66
    • ST-0031, STS-0031 : IP67
  • Temperature and Relative Humidity Output : 0...1 V
  • Conformity to Standards
    • CE / EMC Immunity:
      • EMC Directive
      • 2004/108/EG: EN61000-6-1: 2001,
      • EN61000-6-2: 2005,
      • EN61000-6-3: 2005,
      • EN61000-6-4:2001 + A11
    • Solder type : Lead free (RoHS Directive) FDA / GAMP Directives Compatible
    • Sensor : Thermistor pt100 RTD option

  • Range
    • Factory default: -40º to +60ºC
    • Optional:-30º to +70ºC
    • Other ranges available
  • Accuracy : ±0.1ºC
  • Resolution : 0.01ºC
  • Storage & operating temp. : -80º to +75ºC
  • Max. Time constant : 1s oil under agitation 10s air
  • Min. Dissipation constant
    • 8mW/ºC oil under agitation
    • 1mW/ºC air

  • Measurement range : 0-100% RH
  • Max. Humidity at sensor:
    • 100% RH upto 80ºC
    • 75% RH at 100ºC
    • 45% RH at 125ºC
    • 15% RH at 150ºC
  • Accuracy (23ºC, 3.3VDC) : ±0.8% RH
  • Resolution : 0.1%
  • Repeatability : 0.3% RH
  • Long Term stability : <1% RH/year
  • Sensor time constant: Typical 10 sec, 63% of a 35 to 80% RH step change (1 m/sec air flow)
  • Sensor : Capacitive

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