User guide

E-M-HC2 Probes-V1_26
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroClip 2 (HC2) Humidity Temperature
Probes: User Guide
Instruction Manual
Document Type
Page
14 of 31
Document title
© 2009-2013; Rotronic AG E-M-HC2 Probes-V1_26
3.6 Connector
All standard probe models of the HC2 series use the same keyed connector (male). The connector is located
either directly on the probe body or at the end of a cable. The probe connector is secured to the matching female
connector with a threaded collar.
Pin-out diagram
3.7 Sensor protection (dust filter)
Most probes of the HC2 series are supplied with a filter to protect the sensors against dust particles and high
air velocity. Depending on the probe model the following types of filter materials are used:
Material Maximum temperature Notes
Polyethylene 100 °C (212 °F) Recommended filter material for all applications
below 100 °C. Good response and good
protection against fine dust particles. No water
absorption or retention
Teflon 200 °C (392 °F) Good protection against fine dust particles and
salt (marine environments). Moderately slow
response
Stainless steel wire
mesh
200 °C (392 °F) Provides fastest response time. Not
recommended in environments with fine dust
particles (clogging) and in bioactive environments
Stainless steel sintered
filter
200 °C (392 °F) Good response at low humidity levels. Do not use
at high humidity levels. Provides best protection
against abrasive particles
Note: Depending on the probe model, the dust filter is either automatically included with the probe or it must
be ordered separately (see Models).
Probe connector (7-pin male – looking at probe)
Pin # Wire Color Name Function
1 Green VDD (+) 3.3 to 5 VDC
2 Grey GND Power and digital signal
3 Red RXD UART
4 Blue TXD UART
5 White Out 1 analog (+) Humidity 0…100%RH (default)
6 Brown Out 2 analog (+) Temperature -40…60°C (default)
7 Yellow AGND Analog signal ground