Crowcon Xgard IQ Fixed Gas Detector and Transmitter

A SIL2 fixed gas detector with hot-swap sensor modules

The Crowcon Xgard IQ is an intelligent fixed gas detector and transmitter in a 316 stainless steel enclosure. It separates a universal transmitter from a smart sensor module, so one transmitter gives access to Crowcon flammable (catalytic, infrared and MEMS), toxic, oxygen and H2S sensors. Modules are hot-swappable with the tool provided, without a hot-work permit, and the transmitter auto-configures gas type, range, units and alarm levels when a module is plugged in.

Operators get a bright OLED display, a positive-safety LED (amber, red, green) that shows health from a distance, button control without magnets or tools, an event log, smart bump and speedy bump tests, and calibration-due reminders. The detector is SIL2 certified to IEC 61508 and EN 50402.

Technical specifications

Selecting transmitter and sensor module

Select by gas first, then confirm that the sensor operating temperature range fits the site: catalytic methane and propane modules run -40 to +75 C, infrared versions -20 to +55 C, and several toxic modules have narrower ranges, for example HF 5 to 40 C. Choose catalytic or infrared by the poisons and oxygen conditions present. The users can set the full-scale range on the display menu within the sensor options.

Decide on the optional alarm and fault relays, HART and the cable entry type (M20 or NPT). Only the approvals listed for a given sensor apply, so check the FM and ATEX scope against the exact module.

How the Crowcon Xgard IQ works

The Xgard IQ has two parts. The universal transmitter sits in a 316 stainless steel enclosure, and a smart sensor module plugs into it. The module holds the sensor, and the transmitter reads it and converts it to a 4-20 mA signal, Modbus RTU data and optional HART. When a new module is plugged in, the transmitter configures the gas type, range, units and alarm levels by itself. The module can be swapped while the unit is powered, without a hot-work permit.

Where the Crowcon Xgard IQ is used

• Oil and gas sites
• Chemical plants
• Flammable gas detection
• Toxic gas and oxygen monitoring
• Hazardous Zone 1 and 2 areas

Selection checklist for the Crowcon Xgard IQ

• Gas type: flammable, toxic, oxygen or H2S
• Sensor technology: catalytic, infrared or MEMS
• Measuring range
• Supply of 14 to 30 V DC
• Output: 4-20 mA, Modbus or HART
• Relays: alarm 1, alarm 2 and fault
• Cable entries: 3 x M20 or 2 x 1/2 in NPT
• Hazardous area marking and temperature

Installation, commissioning and maintenance notes for the Xgard IQ

Fit the detector at the height that suits the gas, high for light gases and low for heavy gases. Wire the 3-wire 4-20 mA loop, which senses sink or source on its own, and the RS-485 if used. Plug in the sensor module with the supplied tool. Run a smart bump test and calibrate, and follow the calibration due reminder. The event log records alarms, faults and maintenance.

Requesting a quotation for the Crowcon Xgard IQ

Please send the gas, the range, the output, the relay needs, the area details and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

Xgard IQ display and indication

The yellow OLED is 128 by 64 pixels. A positive-safety LED shows amber, red or green health from a distance. Buttons work without magnets or tools.

Xgard IQ toxic sensors

Ranges are listed for ammonia, carbon monoxide, chlorine, HF, H2S, oxygen, ozone and sulphur dioxide.

Xgard IQ accuracy

Repeatability is plus or minus 2 percent of full scale. Zero drift is below 2 percent per year.

Xgard IQ size and weight

The transmitter is 278 by 140 by 89 mm and the whole unit weighs 4.1 kg. The sensor module is 66 by 53 by 45 mm.

Detector records for the Xgard IQ

Keep the bump test dates, the calibration results and the module serial numbers in the gas detection file.

Choosing the right Xgard IQ module

Choose the module from the gas and range, and check the sensor data sheet for its temperature limits.

Documents and quotation

The attached Crowcon datasheet lists the gases, ranges, sensor temperature limits and approvals. Send the gas, range, output, relay and certification need for a quotation. See more fire and gas detectors.