HOBO® H8 Temp, RH, Light & External   |    Ref: OC-H08-004-02

HOBO® H8 Logger for RH/Temp/Light/External
Measure:
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
Readout and relaunch with optional HOBO Shuttle
Internal temperature sensor on 4" wire can extend from case
Models with external input accept external sensors for temperature, AC current, 4-20 mA and 0-2.5 Volts DC
Precision components eliminate the need for user calibration
Drop-proof to 5 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 (RH sensor range at right)
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)
Compliance certificate available
NIST-traceable temperature accuracy certification available
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: ±1.27°F (±0.7°C) at +70°F, see plot to right
Resolution: 0.7°F (0.4°C) at +70°F
Response time still in air: 15 min. typical with sensor inside case; 1 min. typical 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 to right
Accuracy: ±5%
Response time 10 min. typical in 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 footcandles (lumens/ft2)
Accuracy: ±2 footcandles, ±20% of reading
Angular response: roughly cosine of the angle from directly above sensor
Light wavelength response, see plot too right
External inputaccepts one of the following sensors:

Wide range of temperature sensors (TMCx-Hx series)
Split-core CTs for AC current (5 Models)
4-20 mA input cable (CABLE-4-20mA)
0-2.5 V DC input cable (CABLE-2.5-STEREO)
External 2.5 volt input specifications

2.5 mm jack: external input ground, input, switched 2.5 V output; external 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 Volts DC
Accuracy: ±10 mV ±1% of reading
Resolution: 10 mV (8-bit)
Out power: +2.5 Volts DC at 2 mA, active only during measurements


A software starter kit is required for operation
BoxCar Pro or BoxCar starter kits are available. Each starter kit includes software, computer interface cable and software manual. If you already have logger software, you can refer to the Logger Software Compatibility Chart. Upgrades for BoxCar Pro and BoxCar are available on this website. USB Serial Adapter available.