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

$139600
Delivered Price
NIST Certification $125

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 93/4", Width 5",
                                Height 91/2", 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 8147R Thermo-Hygrograph $89500 Delivered Price

Charts and Accessories
Delivered Prices
For Models 8145 & 8147 Fahrenheit, order #812 Charts (daily/weekly)
$5800/pk. of 105
For Model 8145 Celsius, order #811 charts (daily/weekly)
$5800/pk. of 105
For Models 8145 & 8147, order #TH745 Charts (monthly)
$5800/pk. of 105
P2—long writing pens with ink for use for all the above recording instruments
$900 each
NIST Certification
      $125
Questions or Orders —
Call  800/922-0977   8am – 4pm Pacific Time