Thermo-Hygrographs
Model 8145 Thermo-Hygrograph records precise measurements of temperature and humidity. The Durotherm sensing element for humidity will not dry out or get brittle with age, but will go on year after year. The humidity sensor is temperature-compensated by a bimetallic strip which eliminates the expansion of the Durotherm elements due to temperature variations. Lufft's Thermo-hygrographs differ from other manufacturers' units in this respect. The humidity arm is actuated by the sensing element to record minute changes in humidity. The bimetallic temperature sensing element actuates the arm that records small temperature changes. Easily calibrated. Can be certified to NIST.

Model Range Drive/Clock Chart Rotation
8145R +6 to 120°F One "AA" battery/
quartz clock		 Can be set at either
7-days, 24 hr. or
31 day
8145RC -32 to 45°C

Model 8145

Pricing and Purchase available on Abbeon.com
Recording Pens: Long-writing felt tipped nibs (two included)
Charts: One year supply, 55 charts included.
Case: White aluminum case with wrap around clear acrylic panels.
Size & Weight: Length 9¾", Width 5",
                                Height 9½", weight 6 pounds.		 SPECIFICATIONS:
Temperature Accuracy: ±1% of full scale
Temperature Sensor: Bimetallic spring
Temperature Chart Increments: 2° divisions
Relative Humidity Range: 0 to 100%
Relative Humidity Accuracy:
     ±3% Relative Humidity
Relative Humidity Sensor:
     Durotherm Element
Relative Humidity Chart Increments:
     2% divisions
The Model 8147R records precise measurements of both temperature and humidity. The Durotherm sensing element activates the arm that records the humidity and the bimetallic temperature spring activates the arm that records temperature. Easily calibrated. Quartz clock powered by one "AA" Battery. Revolution: Can be set for either 24-hr, 7-day, or 31-day.

SPECIFICATIONS:
Temperature Range: +6 to 120°F
Temperature Accuracy: ±1% of full scale
Temperature Sensor: Bimetallic spring
Temperature Chart Increments: 2° divisions
Relative Humidity Range: 20 to 190%
Relative Humidity Accuracy: ±3% Relative Humidity
Relative Humidity Sensor: Durotherm Element
Relative Humidity Chart Increments: 2% divisions
Recording Pens: Long-writing felt tipped nibs (two included)
Charts: One year supply (55 charts included)
Case: Clear Acrylic
Size & Weight: Length 97/8", Width 51/8", Height 9", weight 5 lbs

Model 8147

Pricing and Purchase of
Model 8147R Thermo-Hygrograph
available on Abbeon.com.
Charts and Accessories
For Models 8145 & 8147 Fahrenheit, order #812 Charts (daily/weekly)
For Model 8145 Celsius, order #811 charts (daily/weekly)
For Models 8145 & 8147, order #TH745 Charts (monthly)
P2—long writing pens with ink for use for all the above recording instruments
NIST Certification
Pricing and Purchase of Charts, Accessories for Thermo-Hygrographs available on Abbeon.com.
Questions or Orders —
Call  800/922-0977   8am – 4pm Pacific Time