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General Monitors has announced that calibrating the model S4000CH combustible-gas detector with a remotely-installed sensor is easy with the company’s automatic remote gas calibrator (ARGC).

The ARGC addresses the need for more convenient and expedient maintenance routines by allowing calibration gas to be applied to the catalytic bead sensor from easily accessible locations.

The ARGC consists of a remote gas calibrator (RGC) and a solenoid valve.

The ARGC blocks ambient air and redirects the calibration gas to the catalytic bead sensor for calibration or testing sensor accuracy.

The instrument can calibrate gases at wind velocities as high as 50mph and maximum temperatures of 75C.

After connecting the ARGC to any S4000CH detector, the calibrator can be operated manually or electronically via Hart or Modbus, or the magnet menu.

A number of lighter-than-air combustible gases are common hazards that collect in ceilings, turbines, ducts and other spaces.

Because these gases typically accumulate above work areas and equipment, the gas detectors must be placed in elevated locations where the gas will rise and come into contact with their sensors.

Performing routine maintenance on combustible-gas detectors in these areas is often difficult, requiring scaffolding, ladders, or lifts to bring the technicians to the sensors.

If the detector is in a confined space – in a tank or pit, for example – a special permit may be needed to access the device.

Invariably, maintenance is hardly routine in these cases and often requires extra precautions and technician time.

The ARGC is suitable for a range of applications, including drilling rigs, compressor stations, refineries, aircraft hangars and warehouses.

It is easy to install and use, requiring no electrical wiring or connectors.

For fully automatic operation from a control room, the two bidirectional protocols (Hart and Modbus) are utilised.

The S4000CH is a hydrocarbon-gas detector suitable for use in SIL 3 applications, is approved by FM, CSA, ATEX and GOST, and has CE marking.

It features a three-digit display and an explosion-proof housing, which allows all data to be processed locally at the sensor site.

The S4000CH is also available with an optional relay configuration that is appropriate for SIL 2 processes.

The S4000CH features one-person calibration for ease of maintenance.

Whether used to perform remote calibration by hand or automatically, the ARGC and the S4000CH are a good combination.

Together they allow operators to calibrate sensors from the ground or in the convenience of a control room, reducing maintenance costs.

Additionally, they reduce the need for planned shutdowns and special work permits.

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