TECHNICAL DATA HD 8901
No. of inputs: 2. Input A for humidity/temperature probes HD
8501S, HD 8501SAT/500, HD 8501 SS/500.
Input B for only temperature probes of the type TP 870, TP 870/C,
TP 870/A, TP 870/P.
-
Measuring ranges: Probe HD 8501S5 ... 98%
R.H. -10...+70°C
(up to +90°C for a short time)
-
*Precision: Relative humidity 5 ... 90%
R.H.: ±2.5% R.H.
points 90 ... 98% R.H.: ±4/-2.5% R.H points
-
Temperature: ±0.2 °C + linearization error (0.04°C/°C) ±l
digit - Resolution: Relative humidity ±l % R. H. Temperature:
±0. 1 °C
-
Response time: Relative humidity: 45%
R.H. -> 90% R.H:
**T63 = 2 sec. T90 = 10 sec. Temperature: T90 = 55 sec. (air
moving at a speed of 1 m/sec.)
-
Probe HD 8501SAT/500: 5 ... 98%
R.H. in the temperature range
-30 ...+130°C.
*Precision, including the probe:
5 to 90%
R.H. 2% R. H. 90 to
100% R. H. = ±4/-2.5% R. H.
Temperature measuring range with the TP 870 series of probes:
-200°C (-328°F) ...+800°C (+1472°F) in two scales with automatic
change of sca1e.
Precision, including the probe:
-50°C (-58°F) ...+200°C (392°F)
± 0.2% of reading ± 0.2°C (±0.4°F) -200°C (-328°F)...-50°C
(-58°F) and +200°C (+392°F) ...+800°C (+1472°F): ±0.4% of
reading ±l °C (2°F).
Functions: automatic switch-off, automatic change of temperature
scale, HOLD, storage of MAX, MIN and relative measurements.
Indications on the LCD display: height of figures 12.5 mm, symbols
HOLD, °C, °F, % R.H., RCD, MAX, MIN, REL, g/M3, Err for no probe,
broken probe or inverted connector.
Instrument range: -10°C ...+50°C, 0 ... 90%
R.H. Power supply:
9V battery, IEC 6LF22.
Battery Iife: 200 hours with an
alkaline battery.
Probe connection: Input A, DIN 5-poIe connector, humidity and
temperature probe Input B, DIN 8-poIe connector, temperature probe.
*This precision refers to measurements Iasting Iess than 15
minutes. If the hygrometric sensor is exposed to humidity IeveIs close
to saturation for periods of over 30 minutes an excess
deviation of up to +6% R.H. is measured. This deviation is memorized
in the sensor when normal humidity IeveIs return ( Iess than 90% R.H.).
The sensor resumes its original characteristics if it is exposed to
humidity IeveIs of Iess than 80% R.H. for about 24 hours.
**This response time refers to a measurement in air at a constant
temperature.
For a correct measurement the temperature of the
humidity sensor must be the same as that of the air of which you
wish to measure the humidity. Differences in temperature between the
sensor and the air cause errors in measurement because the
temperature influences the relative humidity of the air. The higher
(or Iower) temperature of the case radiates heat to the sensor.