HOBO^® H8 Family

Temperature Relative Humidity Light Intensity External

Features and specifications

Capacity: 7943 measurements total User-selectable sampling interval: 0.5 seconds to 9 hours, recording times up to 1 year Internal temperature sensor on 4" wire can extend from case Models with external input accept external sensors for temperature, AC current, 4-20mA and 0-2.5V DC Precision components eliminate the need for user calibration Drop-proof to 8 feet Mounting kit included (hook/loop, magnet, and tape Programmable start time/date Memory modes: stop when full, wrap-around when full Nonvolatile EEPROM memory retains data even if battery fails Blinking LED light confirms operation User-replaceable battery lasts 1 year Battery level indication at launch Operating range: -4°F to +158°F (-20°C to +70°C), 0 to 95% relative humidity, non-condensing, non-fogging (range is less for RH sensor) Time accuracy: ±1 minute per week at +68°F (+20°C) Size/Weight: 2.4 x 1.9 x 0.8" (68 x 48 x 19 mm)/approx. 1 oz.(29 gms)

Measurement specifications

Temperature (internal sensor)

• Range: -4°F to +158°F (-20°C to +70°C)
• Range for internal sensor when used outside of case: -40°F to +248°F (-40°C to +120°C)
• Accuracy: ±1.3°F (±0.7°C) at +70°F, see plot below
• Resolution: 0.7°F (0.4°C) at +70°F
• Response time still in air: <15 min. with sensor inside case; <1 min. with sensor outside case

Relative humidity (user-replaceable RH sensor)

• Range: 25% to 95%, RH at +80°F for intervals of > 10 seconds, non-condensing and non-fogging, see plot below
• Accuracy: ±5%
• Response time <10 min in still air
• Sensor operating environment: +41°F to +122°F (+5°C to +50°C) non-condensing and non-fogging

  
  

  Light intensity

• Range: 2 to 600 lumens/ft²
• Accuracy: ±2 lumens/ft², ±20% of reading
• Angular response: roughly cosine of the angle from directly above sensor
• Light wavelength response, see plot below

  

  External input accepts one of the following sensors:

• Wide-range temperature sensor (TMC6-HA)
• High-accuracy temperature sensor (TMC6-HB)
• Split-core CTs for AC current (5 Models)
• 4-20 mA input cable (CABLE-4-20mA)
• 0-2.5 DC input cable (CABLE-2.5-STEREO)

   

  External 2.5 input specifications

• Three-wire connection: input ground, input, switched 2.5 V output; input ground connection is not the same as PC interface connection ground and should not be connected to any external ground

• Input range: 0 to +2.5 DC Volts
• Accuracy: ±10 mV ±0.5% of reading
• Resolution 10 mV
• Output power: +2.5 DC Volts at 2 mA, active only during measurements

 Ordering Information

Accessories

*External sensor sold separately.