Solid State Gas Sensor Monitors 20X/200X

Sierra Monitor’s 20X/200X gas sensor monitors consist of three gas sensor modules used to monitor combustible gas, Hydrogen Sulfide (H2S), and Carbon Monoxide (CO).

The 20X/200X monitors are based on solid state (semiconductor) technology, a simple and robust method of detection capable of detecting low points-per-million (ppm) levels of gases.

Though the 20X and 200X monitors look different in structure and size, the two monitors function similarly. The solid-state type sensor and associated electronic circuitry ensure trouble-free, long-term operation. There are no pumps, filters, or chemical cells to replace or maintain. With the exception of periodic calibration to verify the alarm setting, no attention is required after installation. The standard configuration has a normally operating relay, with a fail-safe normally operating closed relay being field selectable.

The Solid State Gas Sensor Monitors 20X and 200X are approved and certified by a variety of third party agencies, including UL and CSA. These approvals and certifications assure our customers that we carry only the highest quality of products and performance.

Solid State Gas Sensor Monitor 20X/200X

  • No Periodic Maintenance – Operate monitors free of maintenance; no need to replace chemical cells
  • Compact Unit – Easily install and connect to an alarm panel

Dry Contact Relay for connection to remote fire panels

  • Explosion-Proof Enclosure (20X) – Continuously operate in work areas where hazardous gases could be present
  • Self-Check (200X) – Detect sensor failure for reliable operation

Specifications for Solid State Gas Sensor Monitor 20X/200X

Model Numbers

  • Model 20X Series - All-Weather, Explosion Proof
    • 201 - Combustible Gas
    • 203 - Hydrogen Sulfide
    • 206 - Carbon Monoxide
  • Model 200X Series - Compact
    • 2001 - Combustible Gas
    • 2003 - Hydrogen Sulfide
    • 2006 - Carbon Monoxide

Sensor Type

  • 20X/200X: Solid State MOS (Metal Oxide Semiconductor)

Indicators

  • 20X: Internal LED for calibration
  • 200X: Visual
    • Green LED for Monitor “ON”/Safe
    • Red LED for Alarm
    • LEDs oscillate on/off for sensor failure
  • 200X: Audible                                   
    • Sustained alarm tone for as long as gas is present. Interrupted tone or sensor failure

Range (at 50% relative humidity)

  • 201/2001:
    • 300 - 2,000 ppm Hydrogen
    • 500 - 10,000 ppm Methane
  • 203/2003: 10 - 50 ppm Hydrogen Sulfide (H2S)
  • 206/2006: 50-500 ppm Carbon Monoxide (CO)

Periodic Maintenance

  • 20X/200X: None, other than routine calibration

Factory Alarm Setpoint (200X)

  • 2001: 1000 ppm Methane
  • 2003: 50 ppm H2S
  • 2006: 100 ppm CO

Input

  • 20X/200X: 9 - 24 VDC (+/- 1 V), 250 mA
  • 200X: Plug-in 120 VAC AC/DC Power Supply is provided

Output

  • 20X/200X:
    • 0.5 AMP dry contact, 100 VAC, 130 VAC
    • Nominal 5 volts DC, source 25 mA
    • SAFE and ALARM signals
  • 200X:
    • SAFE and ALARM signals 70 dB buzzer
    •  TTL interface to Model 2102 Alarm Panel is user configurable

Response Time

  • 201/2001: Less than 30 seconds
  • 203/2003: Less than 60 seconds
  • 206/2006: Less than 30 seconds

Operating Temperature Range

  • 20X/200X: -4 o to 158oF (-20o to 70oC)

Enclosure Material

  • 20X: Cast aluminum for protection against galvanic corrosion
  • 200X: Aluminum

Enclosure (20X)

  • Class I, Division 1, Groups C, D

Size

  • 20X: 6.75 x 4.0 x 3.5 in. (17.1 x 10.2 x 6.0 cm)
  • 200X: 3.7 x 2.2 x 1.1 in. (9.4 x 5.7 x 2.8 cm)

Weight

  • 20X: 24 oz. (678 g)
  • 200X: 3.8 oz. (108 g)

Approval

  • 20X
    • UL 61010-1:2004
    • CSA-C22.2
  • 200X
    • UL 61010-1:2001
    • CSA-C22.2

How to Purchase the Solid State Gas Sensor Monitor

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