Siemens SITRANS FS230 Compact Operating Instructions page 13

Note
Improvement of interference immunity
•
Lay signal cables separate from cables with voltages > 60 V.
•
Use cables with twisted wires.
•
Keep device and cables in distance to strong electromagnetic fields.
•
Use shielded cables to guarantee the full specification according to HART.
Connect a load resistor of at least 230 Ω in series in the signal circuit in order to guarantee fault-free HART
•
communication. When power supply isolators are used for SITRANS HART transmitters, a load resistor is already
installed in the device.
4.2 Transmitter
Preparing for the connection
1. Loosen the four lid screws.
2. Open the lid.
3. Remove F-connector tool from wall mount housing.
Figure 4-1 F-connector tool location
Connecting the flow sensor cables
When connecting the sensors it is required for the system to function that the sensor cables are connected correctly. Both
sensor cables for each path must be connected to the same port numbers (1A and 1B or 2A and 2B) on the transmitter.
The sensor cables are delivered with a premounted F-connector at transmitter end.
1. Remove blind plug from wall mount housing.
2. Slide the cable gland back onto the cable and allow access for ther F-connector tool.
3. Place F-connector tool around cable and slide up to engage F-connector nut.
4. Push cable through gland opening. Ensure that center lead is aligned with connector port in transmitter.
5. Tighten F-connector using tool until you meet mechanical stop.
12
SITRANS FS230
A5E38755607-AA, 02/2017