How to maintain the Honeywell Sensepoint XCD RFD remote flammable gas detector?

How to maintain the Honeywell Sensepoint XCD RFD remote flammable gas detector?

Product Overview

Sensepoint XCD RFD is a remote flammable gas detector suitable for hazardous areas (Class I, Division 1, Groups B, C, D), supporting remote installation of sensors (up to 30 meters), detecting flammable gases through catalytic combustion technology, providing 4-20mA analog output and 3 programmable relays, optional Modbus communication function, non-invasive operation (magnetic rod activation) and explosion-proof certification, mainly used for safety monitoring of flammable gases in industrial scenarios.

Core functions and technical features

1. Detection capability

Applicable gases: flammable gases such as methane, propane, hydrogen, ethylene, etc. (catalytic combustion technology).

Sensor type:

705 standard LEL sensor: operating temperature -55 ° C to+80 ° C, UL and CSA certified.

705 HT High Temperature LEL Sensor: Operating Temperature -40 ° C to+150 ° C, UL Certified Only.

Performance parameters:

Detection range: 0-100% LEL, resolution 1% LEL.

Response time (T90):<25 seconds.

Accuracy: ± 1.5% LEL.

2. Output and Communication

Analog output: 4-20mA current signal (configurable as source or drain mode), output<1mA in case of fault, output 2mA or 4mA in suppression mode.

Relays: 3 programmable relays (default A1, A2, fault), supporting normally open/normally closed switching, contact capacity 5A@250VAC .

Optional Modbus RTU: communicates via RS485, supports 9600/19200 baud rates, can transmit data such as gas concentration and alarm status, and can be configured with slave addresses 1-247.

3. Operation and Configuration

User interface: LCD display screen, displaying gas concentration, alarm status, fault codes, etc., operated through magnetic stick activation buttons.

Menu function: Supports calibration, parameter configuration (range, alarm threshold, relay action, etc.), password protection (default 0000).

Calibration: Calibration flow housing is required, clean air is used for zero calibration, and 50% LEL standard gas is used for range calibration. It is recommended to calibrate once every 6 months.

Installation and wiring

1. Installation requirements

Environmental conditions: Operating temperature -40 ° C to+65 ° C (transmitter), humidity 10-99% RH (non condensing), protection level IP66.

Sensor installation: Remote installation requires the use of a junction box (such as 2430-0021), with a cable length of ≤ 30 meters, and the sensor sintered surface facing downwards to ensure IPX6 protection.

Explosion proof requirements: Cable entrances must be equipped with sealed joints, with a distance of ≤ 18 inches (45cm) from the detector, and grounding must be connected at a single point to avoid loops.

2. Wiring specifications

Power supply: 16-32VDC (nominal 24VDC), power consumption ≤ 5W.

Cable selection: It is recommended to use shielded twisted pair cables with a cross-sectional area of 0.5-2.5mm ² (20-13 AWG). Remote sensor cables must comply with the AWM2464 standard.

Terminal definition: including power supply, 4-20mA signal, relay, Modbus (optional), and sensor interface. Specific wiring needs to refer to the terminal table.

Calibration and maintenance

1. Calibration process

Zero point calibration: performed in clean air or using zero gas (such as compressed air).

Range calibration: Introduce 50% LEL standard gas and confirm the calibration value after stabilization.

Cross calibration: If using non target gas calibration, refer to the star rating table for adjustment (if using methane to calibrate ethylene, set the 62% LEL range).

2. Daily maintenance

Sensor replacement: Power off operation is required, and recalibration is required after replacement. The lifespan of the sensor is usually 36 months (affected by toxic substances such as silicone and sulfides in the environment).

Troubleshooting: By using fault codes (such as F02 indicating sensor failure and F03 indicating zero drift), common problems include wiring errors, power supply failures, and sensor malfunctions