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Home > Gas Detection > Fixed Point Gas Detection Systems > RS-485 Digital Highway Gas Detection System
RS-485 Digital Highway Gas Detection System
System Overview
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The SEC 1500 and 2000 are digital gas detectors, that are designed to detect one of a number of gases, display the concentration of that particular gas and provide an alarm when gas concentration reaches a preset level. These detectors will operate as a stand alone gas detector with its own relay output and LED display. An industry standard 4-20 mA output enables the detector to be connected to an analog system, such as PLC, DCS and TMR systems.
The operating parameters (relay action, alarm set values, sensor configuration, etc.) can be viewed or changed using the SEC 2500 Hand Held Programmer or SEC Supervision Plus software. The 2500 can communicate anywhere on the network with any detector using either an infrared link, an RS-485 data highway or by plugging directly into any detector.
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An RS-485 digital output enables the detector to communicate to a PC running Supervision Plus software. The detector network is formed by connecting a single twisted shielded pair of cable wires, reducing cabling and installation costs.
The SEC 1500 and 2000 retain operating parameters and calibration settings when powered down. An on board microprocessor provides continuous self diagnostics and identifies problems using fault codes. Four operation 8 amp SPDT relays respond to Low, Mid and High gas alarms as well as any fault conditions.
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Specifications
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Specification
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SEC 2000
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SEC 1500
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| Detection Method |
Combustible Gas: Catalytic-LEL, Solid State-ppm |
Combustible Gas: Catalytic-LEL, Solid State-ppm |
| Toxic Gases: Electrochemical, Solid State |
Toxic Gases: Electrochemical, Solid State |
| Oxygen: Galvanic |
Oxygen: Galvanic |
| Sampling Method |
Diffusion, optional sample draw pump |
Diffusion, optional sample draw pump |
| Alarms |
Visual indication and relay contacts for low, mid, high and fault |
Visual indication and relay contacts for low, mid, high and fault |
| Output (Digital) |
RS-485 LAN |
RS-485 LAN |
| Output (Analog) |
4-20 mA, max 1000 ohm load at 24 VDC supply voltage |
4-20 mA, max 1000 ohm load at 24 VDC supply voltage |
| Relay, Type & Rating |
8 amps @ 250 VAC, 8 amps @ 30 VDC |
8 amps @ 250 VAC, 8 amps @ 30 VDC |
| Relay Operation |
Selectable latching or non-latching, selectable normally energized or normally de-energized (except fault), selectable alarm relay off delays, manual relay control |
Selectable latching or non-latching, selectable normally energized or normally de-energized (except fault), selectable alarm relay off delays, manual relay control |
| Operating Voltage |
24 VDC, operating range 18 to 32 VDC (measured at detector head) |
24 VDC, operating range 18 to 32 VDC (measured at detector head |
| Housing Construction |
Electronics: epoxy coated explosion proof aluminum housing |
NEMA 12, NEMA 4, NEMA 4X fiberglass and NEMA 4X stainless steel |
| Sensor: anodized explosion proof aluminum housing optional stainless steel |
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| CSA/NRTL Certification |
Class 1, Div 1, Groups B, C D |
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| UL Certification |
Combustible - Catalytics, Class I, Zone 0, 1, 2 Hazardous Locations |
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Gases & Ranges
| Gas |
Range
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| Ammonia |
0-200 ppm
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| Arsine |
0-1,000 ppb
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| Bromine |
0-2 ppm
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| Carbon Monoxide |
0-100 ppm
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| Chlorine |
0-10 ppm
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| Chlorine Dioxide |
0-2 ppm
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| Combustible |
0-100% LEL
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| Diborane |
0-1,000 ppb
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| Ethylene Oxide |
0-20 ppm
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| Fluorine |
0-2 ppm
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| Formaldehyde |
0-20 ppm
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| Germane |
0-1,000 ppb
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| Hydrogen |
0-1,000 ppm
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| Hydrogen Chloride |
0-20 ppm
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| Hydrogen Cyanide |
0-20 ppm
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| Hydrogen Fluoride |
0-10 ppm
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| Hydrogen Selenide |
0-1,000 ppb
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| Hydrogen Sulfide |
0-100 ppm
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| Nitric Oxide |
0-100 ppm
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| Nitrogen Dioxide |
0-15 ppm
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| Oxygen |
0-40% Vol
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| Ozone |
0-2 ppm
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| Phosgene |
0-2 ppm
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| Phosphine |
0-1,000 ppb
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| Silane |
0-20 ppm
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| Sulfur Dioxide |
0-20 ppm
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Ordering Information
For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email sales@afcintl.com
Downloads
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Features
The SEC 1500 is designed for non-hazardous environments
The SEC 2000 is designed for hazardous environments
Low cost installation
Over 20 different gases can be detected
CSA/NRTL approved
Combustible detector is UL approved
Industry standard 4-20 mA output
RS-485 digital output
User friendly, one person calibration
Provides continuous self diagnostics
Relays can be set to turn on alarms, shut doors, turn on fans, etc.
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