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Model IR-700-CH.png

Combustible Gas Sensor Model IR-700-CH

Brand: Detcon Inc
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Model IR-700-CH is a non-intrusive “Smart” sensor designed to detect and monitor combustible hydrocarbon gases in air over the range of 0-100% LEL using miniature non-dispersive Infrared Optical (NDIR) sensor technology. 

As compared to catalytic bead sensors, with NDIR there is no risk of sensor poisoning, no risk of high concentration saturation, and no need for O2 to be present. 

The plug-in, field replaceable detector features over-sized gold-plated connections that help prevent corrosion. 

The IR-700-CH’s rugged framework includes an electro-polished 316 stainless steel housing with fully encapsulated electronics and dual layer surge protection. 

This innovative design virtually eliminates sensor failure due to water ingress, corrosion, vibration, and transient spikes. 

A primary feature of the Model IR-700-CH is embedded intuitive software that simplifies operator interface by guiding the user through routine calibration, configuration, and fault diagnostic functions using a built-in alpha/numeric display. 

The Model IR-700-CH is equipped with standard analog 4-20mA, and Modbus™ RS-485 outputs. Among its unique features is a wireless option that can be used with Detcon’s SmartWireless® product line. 

Additional integration options include a Remote Alarm Module (RAM) and HART. Detcon’s combustible gas sensor has an infinite shelf life and is supported by a 5-year warranty.
Features
  • Failsafe User-Friendly Interface 
  • LED Display (With Antiglare Cover) 
  • Full Text Display Method 
  • Non-intrusive Interface 
  • Auto Zero/Auto Span 
  • Pre-emptive Fault Diagnostics Environmentally Bulletproof 
  • Electropolished 316SS Construction 
  • 100% Epoxy Encapsulated Circuitry 
  • Bulletproof I/O Protection 
  • Water-Proof, Corrosion-Proof, Vibration-Proof Modular and Serviceable 
  • Modular Design 
  • Plug and Play Components 
  • Quick Thread Release (For Sensor Replacement) 
  • Integral Calibration Port

View_Details

Specifications

Brand

Sensor Type

  • Continuous diffusion/adsorption
  • Non-dispersive Infrared Optical (NDIR) - Combustible Gas
  • Sub-miniature plug-in field replaceable

Sensor Life

  • 5 years typical

Measurement Range

  • 0-100 % LEL (lower explosive limit)
  • 0-100 % by volume

Accuracy

  • ± 2 % Full Scale (0-50 % LEL)

Repeatability

  • ± 2 % Full Scale

Response Time

  • T50 < 6 seconds, T90 < 10 seconds

Zero Drift (typical)

  • ≤ 2 % per 2 years

Outputs

  • Linear 4-20 mA DC
  • RS-485 MODBUS-RTU

Electrical Classification

  • Explosion-proof
  • CSA and US (NRTL)
  • Class I, Div. 1, Groups B, C, D (Tamb = -40° to +75° C)
  • Class I, Zone 1, Group IIB+H2
  • ATEX
  • II 2 G Ex d IIB + H₂ T4 Gb (Tamb = -40° to +70° C)

Ingress Protection

  • NEMA 4X, IP66

Safety Approvals

  • cCSAUS Performance to ISA 12.13.01-2000 and CSA 22.2 #152
  • ATEX
  • CE Marking
  • SIL 2 Certified to IEC 61508 (ATEX version only)

Warranty

  • Plug-in detector - 5 years
  • Transmitter - 2 Years

Operating Temperature Range

  • -40° to +167° F; -40° to +75° C

Storage Temperature Range

  • -40° to +167° F; -40° to +75° C

Operating Humidity Range

  • 0-100 % RH, Non-Condensing

Dimensions

  • 7" H x 2.2" Dia.; 178 mmH x 65 mm Dia. (sensor assembly only)
  • 11" H x 6.1" W x 3.75" D; 280 mmH x 155 mmW x 96 mmD (with junction box)
  • Mounting holes (J-box) 5.5"; 140 mm center to center

Weight

  • 2 lb, 0.907 kg (sensor only)
  • 2 lb, 2.72 kg (with Aluminum J-Box)
  • 9 lb, 4.08 kg (with Stainless Steel J-Box)

Power Input

  • 11-30 VDC

Power Consumption

  • Normal operation = 68 mA (< 1.7 watt)
  • Maximum = 85 mA (2 watts)

Inrush Current

  • 0.67A @ 24 V

RFI/EMI Protection

  • Complies with EN 50270

Analog Output

  • Linear 4-20 mA DC (1,000 ohms max loop load @ 24 Vdc)
  • 0 mA - All Fault Diagnostics
  • 2 mA In-Calibration
  • 4-20 mA 0-100 % Full Scale
  • 22 mA Over-range condition

Serial RS-485 Output

  • RS-485 Modbus RTU

Baud Rate

  • 9600 BPS (9600,N,8,1 Half Duplex)

Status Indicators

  • 4-digit LED display with gas concentration Full-script menu prompts for AutoSpan, Set-up Options, and Fault Reporting

Faults Monitored

  • Loop, Input Voltage, Zero, Sensor, Processor, Memory, Calibration

Cable Requirements

  • Power/Analog 3-wire shielded cable Maximum distance is 13,300 ft with 14 AWG
  • Serial Output 2-wire twisted-pair shielded cable specifically for use with RS-485 installations Maximum distance is 4,000 ft to last sensor

I/O Protection

  • Over-voltage, Miswiring, EMI/RFI Immunity

  • Oil and Gas Drilling Rigs 
  • Oil and Gas Production Sites 
  • Offshore Production Platforms 
  • FPSOs 
  • LNG/CNG Plants 
  • Refining and Petrochemical 
  • Pulp and Paper Mills 
  • Waste Water Treatment Plants

Documentation

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