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3.2 Gas Ports
On the bottom of the FTC320 housing two tubes with 6mm outer diameter for gas connection are lo-
cated. They are labeled with “GAS IN “ and “GAS OUT“.
For low requirements regarding gas tightness and resistance to pressure, the tubes can be used as
hose connectors. For permanent gas and pressure tightness compression fittings are recommended
(e.g. by “Swagelok“©).
After connecting the device, a leakage test should be performed (especially when working with flammable
and/or toxic gases).
3.3 Leakage Test
After connecting the gas pipes, a leakage check of the joints must be carried out, e.g. with foam-forming
agents (soap solution or leak detection spray). The test is to be carried out at an overpressure of at
least 1 bar or the pressure expected in operation (max. 3 bar abs.) if this is higher.
The internal gas path of every FTC320 for use in potentially explosive atmospheres is tested for leakage
during production at a pressure of 4 bar for a holding time of 30 minutes.
3.3.1 Housing Seal
The housing leakage test is performed as a routine test according to DIN EN 60079-15:2020-03, sec-
tion 12.2.2.1.2. The interior of the housing is filled with glass beads to minimize the internal free volume.
Therefore the device may only be opened by the manufacturer. Unauthorized opening will ren-
der the instrument unsuitable for use in zone 2. Regular replacement of the silicone seal is not
necessary, but it is recommended that the manufacturer checks the tightness of the housing every 5
years. If the unit is installed in atmospheres that are highly corrosive to plastics, it is recommended to
have the inspection carried out more frequently.
3.4 Electrical Connectors and Ground
1: Analog Input 1
2: Analog Output 2
3: Analog Reference
4: Digital Input (24V)
5: Ground pin 4
6: Analog Output 1
7: Analog Input 2
1: 0 (4) - 20mA,
isolated +
2: 0 (4) - 20mA,
isolated -
3: Ground
RS232
4: TxD
5: RxD
1: Relay 1 - A
2: Power Supply-GND
4: Power supply +24V
3: Relay 1 - B
7: Relay 3 - A
6: Relay 2 - B
5: Relay 2 - A
8: Relay 3 - B
A
B C
Figure 3.2: Electrical connector pin assignments of the three connectors on the FTC320
The FTC320 has three plug connectors as shown in Figure 3.2. The cables (712, IP67) with molded
connector plug and a length of two meters (five meters available on request) are part of the purchased
File name:
FTC320Ex Operating Manual_1.09KD201009MPO3V04.pdf
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