If the Gas Inlet Port is compromised and SENTRO X does not respond to gas as required, fit a replacement Gas Inlet Cover to uphold the IP rating.
The manual lists Replacement Gas Inlet Cover part number P5600.130.SP.
The analogue output characteristics table lists maintenance and warmup state at 3.1 mA or 0.31 V.
Fault output is listed separately, and normal operating range is between 0% and 100% full scale.
SENTRO X is configured to always de-energise relay coils when power is absent as a fail-safe condition.
Relay behaviour should be considered when designing external intrinsically safe alarm or control circuits.
No. To maintain explosion protection, SENTRO X must only be serviced and repaired by Trolex Ltd or a local Trolex service agent approved by Trolex Ltd.
The manual references IEC/EN 60079-19 for repair guidance.
Check the Gas Inlet Port and perform Zero and Span response checks. The manual states that IP65 does not imply that the equipment will detect gas during and after exposure to those conditions.
If response is still not as required, replace the Gas Inlet Cover and follow calibration or service guidance.
Check the Controller to Remote Sensor wiring, including +V, 0 V, B and A connections, cable length, and the rBloc/Remote Sensor terminals.
Also confirm the gBloc is correctly installed and that the approved cable or conduit arrangement meets the certification requirements.
Check RS485 wiring, address, baud rate, parity, stop bits, endianness, and byte swap settings. SENTRO X uses MODBUS RTU over 2-wire half duplex RS485.
The default address is 1, default parity is Even, default stop bits are 1, and default baud rate is 115200.
Check whether Ethernet is configured for Dynamic or Static addressing. Dynamic requires a DHCP server to provide IP information.
If Static is used, confirm the IP address, subnet mask, and gateway settings match the network design and that the Ethernet Card is installed in the correct slot.
Confirm the relay card is fitted in an allowed slot, the relay assignment is configured for the intended setpoint, fault, or over-range signal, and the external circuit is an approved intrinsically safe circuit.
The relay contacts have a maximum contact voltage of 16 V DC and maximum switching current of 250 mA.
Confirm that the A/V Alarm is fitted and that the LED beacon and sounder are assigned to the relevant Warning, Alarm, Fault, or Over-range functions.
Default settings enable the sounder and beacon for Alarm, Over-range, and Fault, but Warning is off by default.