Comet H5421 User Manual

IE-HGS-H5(6)4XX-05
28
Specific humidity
3
Accuracy: ±2g/kg at ambient temperature T < 35°C (95 °F)
Range: 0 to 550 g/kg
Mixing ratio
3
Accuracy: ±2g/kg at ambient temperature T < 35°C (95 °F)
Range: 0 to 995 g/kg
Specific enthalpy
3
Accuracy: ± 3kJ/kg at ambient temperature T < 25°C (77 °F)
Range: 0 to 995 kJ/kg
4
The values computed from ambient temperature and relative humidity including their
accuracy you can exactly determine by the program Conversions. It is free to download at
www.cometsystem.com.
10.2. Operating conditions
Operating temperature range:
electronics H5421, H6421: -30 to +80 °C (-22 to 176 °F)
electronics H5424, H6420: -30 to +60 °C (-22 to 140 °F)
measuring end of stem H6420: -30 to +80 °C (-22 to +176 °F)
CO
2
probe H5421, H6421 -40 to +60 °C (-40 to +140 °F)
RH+T probe H6421: -30 to +105 ºC (-22 to +221 ºF)
It is recommended to switch off the LCD display at ambient temperatures above 70°C (158
°F) around electronics.
Operating humidity range:
H5421, H6421: 0 to 100 % RH (no condensation)
H5424, H6420: 5 to 95 % RH (no condensation)
Operating barometric pressure range 850 to 1100 hPa
Protection:
H5421 IP65 (electronics), IP65 (CO
2
probe)
H5424 IP30 (electronics)
H6420 IP30 (electronics), IP40 (measuring end of stem)
H6421 IP65 (electronics), IP65 (CO
2
probe), IP40 (RH+T probe)
Other environmental conditions (external influences) according to HD 60364-5-51: normal
Recommended calibration interval:
H5421 5 years (CO
2
)
H5424 5 years (CO
2
)
H6420 5 years (CO
2
), 1 year (relative humidity), 2 years (temperature)
H6421 5 years (CO
2
), 1 year (relative humidity), 2 years (temperature)
Working position:
H5421, H6421: negligible
H5424: with cable glands upwards
H6420: with sensor cover downwards
3
This value depends on the atmospheric pressure. For computing is used constant value stored in device memory. Default
value preset by manufacturer is 1013hPa and can be changed by user’s software.
4
This maximum is reached under conditions about 70°C/100%RH or 80°C/70%RH

Comet H5421 Specifications

General

Brand	Comet
Model	H5421
Category	Measuring Instruments
Language	English