- weather stations
- controlled environments
- glasshouses
- museums
- environmental monitoring
MEASUREMENT SPECIFICATIONS | |||
Relative Humidity | Air Temperature | Air Pressure | |
Range of measurement outputs | 0 to 100% RH | -40 to +60 °C | 800 to 1100 mbar |
Conversion of outputs to units | 40mV/%RH (0 to 4 volt models) 20mV/%RH (0 to 2 volt models) | 40mV/%RH (0 to 4 volt models) 20mV/%RH (0 to 2 volt models) | 13.333 mV/mbar (0 to 4 volt models |
Sensing element measurement errors | 0 to 100% RH Typ ± 2%RH @25°C 90% to 100 RH - rising from ±2.5%@ 90% to ±3.5% @100% - max error @ 25°C | 0 to 80°C, typ <0.2°C max <0.4°C | With single point calibration in the range 800-1100mbar -20 to +85°C and 800 to 1100mbar max error <2.5mbar |
SPECIFICATIONS COMMON TO ALL MODELS | |
Analogue Outputs | Between 0 and 4 volts - see separate table |
Operating Temperature Range | -40 to +60 °C |
IP Rating | IP 68 |
Power Supply | 5-15 volts |
Cable | Def Stan 7-1 Type C Braid Screened Cable with PVC sheath |
Analogue Output Resolution | 16 bits - 1 part in 65536 |
Datalogger Impedance | 1 megohm or higher |
Current Consumption (normal operation) | mean c.3mA max c.6.5mA (current peaks each 5 secs for repeating measurement cycles) |
Output Latency | c.500ms (time from valid power supply voltage establishment to valid output delivery). N.B. Outputs are stable as long as supply remains valid. |
Part Number | Relative Humidity | Air Temperature | Air Pressure | Output | Housing |
SKAM 852 |  | | | 0 - 2 volt | Anodised aluminium tube with |
SKAM 854 | | | | 0 - 4 volt | Anodised aluminium tube with |
SKAM 85x | | | | Customisable between | Anodised aluminium tube with |
SKAM 862 | | | X | 0 - 2 volt | Anodised aluminium tube with |
SKAM 864 | | | X | 0 - 4 volt | Anodised aluminium tube with |
SKAM 86x | | | X | Customisable between | Anodised aluminium tube with |
SKAM 872 | X | X | | 0 - 2 volt | ABS enclosure 85x82x55mm plus 20mm vent on |
SKAM 874 | X | X | | 0 - 4 volt | ABS enclosure 85x82x55mm plus 20mm vent on |
SKAM 87x | X | X | | Customisable between | ABS enclosure 85x82x55mm plus 20mm vent on |
SKAM 880 | X | | X | 10k thermistor | Anodised aluminium tube with |
 SKRS 085S - radiation screen |
 SKM 225 - pole mounting bracket |
 CAB/H - Extra cable over 3m |
Our range of new PRHT probes incorporate the very latest digital technology and many options are available. The main choices are:
- RH% and Air Temperature in one probe
- RH%, Air Temperature and Air Pressure in one probe
- Air Pressure only
The RHT sensing element is an integrated silicon-based package from Sensirion, does not require recalibration (although annual checks are recommended for accurate measurements) and gives excellent long-term stability. It incorporates a PTFE foil membrane to filter out small dust particles. The Skye electronics takes the raw digital signal and converts it to stable DC voltages proportional to RH% and temperature.
The device for measuring air pressure is a high resolution altimeter sensor from MEAS, Switzerland. It is micro-machined silicon using MEMS Technology, and gives a high linearity pressure sensor. As with RHT element, the Skye electronics takes the raw digital signal and converts it to stable DC voltages proportional to air pressure.
Every sensor is individually calibrated and tested.
