Measures; Gas Connections; Sample Gas Restrictors/Clamping Screws; Safety Instructions - Siemens SIPROCESS GA700 Quick Start Manual

5.1.5.3

Measures

Measures to suppress sparks
● To suppress sparks via relay contacts, you can use RC elements. In direct current
operation, you can also use a spark killer diode instead of the RC element.
● The RC element results in a drop-out delay for an inductive component, for example, a
solenoid valve. To rate the RC element accordingly, use the following rule of thumb:
– R [ Ω ] ≈ 0.2 x R
– C [μF] ≈ I
● You must use a non-polarized capacitor "C".
● When connecting the RC element, refer to the previous figure/figures.
See also
Overview: Spark suppression for rack-mounted device (Page 55)
Overview: Spark suppression for wall-mounted device (Page 56)
5.2

Gas connections

5.2.1

Sample gas restrictors/clamping screws

5.2.1.1

Safety instructions

NOTICE
Leaky gas connections
A gas-tight connection cannot be achieved if you install the clamping ring connections
before a sample gas restrictor or clamping screw was screwed onto the connecting socket.
The gas connection is irreversibly leaky.
• Observe the information provided by the manufacturer of the clamping ring connections.
• Before you install the clamping ring connections, make sure that the connecting socket
Quick Start
Compact Operating Instructions, 06/2017, A5E31805656-05
[ Ω ]
L
[ A ]
L
Observe the corresponding installation guidelines.
is either equipped with a sample gas restrictor or with a clamping screw.
Connecting
5.2 Gas connections
57