Product Overview

The Monicon S500L is a high-quality, self-contained, Intelligent gas sensor that provides fast, reliable warnings against explosive concentrations of combustible gases. It is housed in a compact diameter enclosure and can be configured or calibrated by one person using magnetic switches without declassifying the hazardous area. The S500L uses the proven Monicon CGS500 thermocatalytic sensor combined with advanced microprocessor technology. The gas concentration is indicated on a 4-character alphanumeric display which also indicates instrument status. All user variables are stored in non-volatile memory (EEPROM) and retained indefinitely.

Key Features

• Microprocessor based.
• Certified ATEX II 2G Ex d IIC T6.
• Outputs/Interface: 4-20mA Analogue Output, voltage-free relay contacts, and RS485 digital interface.
• Low power consumption and small size.
• Calibration: "One Person" calibration, fully programmable with no physical adjustments necessary.
• The system uses a watchdog circuit to monitor operation and reset the CPU if a failure is detected.

Applications

• Oil refineries.
• Chemical processing.
• Offshore platforms and Gas pipelines.
• Oil and gas storage depots and Tank farms.
• Laboratories.
• Petrochemical industry.

Technical Specifications

Specification	Value
Full-Scale Range	0-100% LEL (Lower Explosive Limit)
Operating Temperature	-20 degrees C to +60 degrees C
Supply Voltage	Nominal 24Vdc (operates from 20Vdc to 35Vdc)
Power Consumption	2W nominal, 2.3W maximum
Response Time (T90)	Typically less than 15 seconds
Drift	Less than 7% over three months (complies with EN50057)
Analogue Output Load	500 Ohms maximum
Sensor Life	Typically 5-7 years
Weight	1.8Kg (including sensor)

RS485 and Relay Details

• RS485: Slave mode, half duplex, polled. Maximum units on the loop is 100.
• Relay Contacts: SPST, NO, 125V @ 0.5A (30V DC @ 1A) each for A1 & A2.
• Alarm Setting: Digitally adjustable between 10% and 90% of full scale.