MCS GMS C2H2 EC User manual

1
MCS
Medium – Control – Systeme
Franke & Hagenest GmbH
Borngasse 1a * 04600 Altenburg
Telefon : [phone]
Telefax : [phone]
E-Mail : [e-mail]
Instruction C2H2-Sensor, electro-chemical GMS C2H2 EC
Sensor connection
The sensor is supplied with 10-24 Volt direct current by means of 2-wire technology. The polarity is
unimportant due to the built-in rectifier.
The 4 mA basic current is used for powering the assembly.
Shielded cable JY(St)Y 2x2x0.8mm can be used for supplying the sensors.
The lead colours can be assigned as follows:
White => 4-20mA (terminal 2) Red => +24V (terminal 3)
When using sensor casings made from metal, the drain wire from the sensor must be connected to the
floor of the metal enclosure.
Sensing technology
The sensor is operated by electro-chemical 2-wire sensors. Their signal is converted to the measuring
current range of 4-20mA.
A measuring range of electro-chemical sensors can be utilised. By using jumpers these are set to the
corresponding sensor signal (see table).
The service lifetime of the electro-chemical sensors differ depending on the type and is stated on the
data sheet.

2
Adjustment
Electro-chemical sensors must have operated for approx. 1 hour before the adjustment can be
performed.
The calibration gas must have the same temperature as the surrounding area, i.e. the same
temperature as the sensor
Measurement Equipment
Voltmeter 0-2 V
Screwdriver
Zero gas (synthetic air)
Calibration gas (C2H2 5000ppm)
Gas supply equipment (flow regulator, flow meter 0-1 litre/minute)
Gas supply pipe connection
The adjustment is performed as follows:
Zero balance
The balance is performed at the sensor
- Unscrew the cap from the sensor
-Connect a digital voltmeter to the measurement pins “MP” (measurement range 0 - 2 V)
- Connect the testing pipe connector to the filter
- Add a zero gas concentration (synthetic air)
- The gas flow should be 0.5 litres/minute
- The gas temperature should have room temperature
- Now set the voltage with the trimmer “NP” to 0.04 V.
4-20mA balance with calibration gas supply
The balance is performed at the sensor
- Connect a digital voltmeter to the measurement pins “MP” (measurement range 0 - 2 V)
- Connect the calibration gas pipe connector to the filter
- Add a gas concentration (max. measurement range).
- The gas flow should be 0.5 litres/minute
- The gas temperature should have room temperature.
- Now set the voltage with the trimmer “V” to 0.2 V (Gas concentration = measurement range).

3
Jumper setting
Kurzschl. arb.Wid. Verstärk. Verstärk. Verstärk.
Inv. Noninv Temp-K.
Temp-K.
Temp-K.
Temp-K.
Temp-K.
Temp-K.
Temp-K.
NTC off Poto
Sensor K 01
K 02
K 03
K 04
K 05
K 06
K 07
K 08
K 09
K 10
K 11
K 12
K 13
K 14
K 16
P3
CO x x x x x x
H2 x x x x x x
H2S x x x x x x
SO2 x x x x x x
CH2O x x x x x x
SiH4 x x x x x x
NH3 x x x x x
SO2 x x x x x x
HCI x x x x x x
NH3 x x x x x x
PH3 x x x x x x x
NO2 x x x x x
CL2 x x x x x
O3 x x x
NO x x x x x x
EtO x x x x x x
C2H2 x x x x x x x
X = Jumper set
Representation Universal EC sensor
MP NP V + Signal