Ma-Output; Liquid Alarm Sensor La (Optional) - M&C EC-30C Instruction Manual

It is important that the load of the relay contact meets the require-
Note
ments stated on page 14 chapter '5 Technical Data' .

8.8.1 mA-output

By default, the EC-30C has a configurable mA-output. The mA-output value always corre-
sponds to the temperature of the active deep-cooling unit and represents the current
outlet dew point.
You can assign the mA-output value range (0-20mA or 4-20 mA) to a temperature range
∆T. In this case the lower temperature limit T
mA or 4 mA, and the upper temperature limit T
20 mA.
This correlation makes it possible to influence the resolution of the mA signal and e.g. to
achieve an improved measuring accuracy for a smaller temperature range.
The measuring error based on the display of the controller is ±2 % of the measuring range
limit.
The maximum load of the mA output including the supply line is 500 Ohm.
You will find information on how to calculate the correlation between
the mA output signal range and the temperature range in the annex
Note
of this manual on page 68 chapter '12.2 How to configure the
mA-output' .

8.8.2 Liquid alarm sensor LA (optional)

It is possible to connect an external liquid alarm sensor LA to monitor the EX30-C, in order
to protect any downstream analyzing equipment. The LA will detect a condensate leak-
age caused by a possible cooler defect or overload.
The EC-30C connected to the LA gives an alarm signal which will be registered in the alarm
and warning history. The cooler switches the alarm relay to stop the gas supply by either
turning off the sample gas pump or triggering a solenoid shut off valve.
The M&C liquid sensors are based on the principle of electric conduc-
tivity starting from a conductive value of 50 μS/cm.
Note
Learn more about the M&C liquid sensors on our website www.
mc-techgroup.com.
The connecting cable between cooler and external liquid sensor can not exceed a length
of 3 m (19.84 ft.).
51
EC-30C | 1.00.02
corresponds to the mA-output signal of 0
min
corresponds to the mA-output signal of
max
+49 2102 935 888 www.mc-techgroup.com