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201MS For LEL
The New LEL Transmitter From Texas Analytical Controls

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As you would expect from the leader in Hydrogen Sulfide gas technology, Texas Analytical Controls is proud to announce its latest and most reliable LEL Transmitter -- Model 201MS.

The 201MS can be ordered with either a catalytic bead/diffusion sensor or with infrared technology.

The electronics are housed in an explosion-proof enclosure suitable for Class I, Division I, Groups B, C, and D. This rating is maintained throughout the normal operation as well as calibration of the transmitter. Calibration is initiated by a small magnet without opening the cover. Area declassification is not required.

Calibration of the 201MS is fast, simple and reliable. The only 2 items required for calibration are a known standard source of gas and a small magnet. While holding the magnet briefly over the "CAL" label on the front panel, a letter "C" will start flashing on the display, signifying the start of the calibration cycle. Two to four minutes later, the "C" ceases to flash and the program automatically adjusts the internal gain of the unit to the predefined concentration stored in the EEPROM. The display will then reflect the correct concentration of gas applied. A minute later, the alarm relays and the 4/20 mA output become active again. Calibration is complete, no pots to adjust, no ZERO or SPAN voltages to remember and set.

The gas concentration is displayed on a large 3 1/2" digital display. A 4/20 mA output is provided which can be used with any computer or SCADA system in a control room.

Optional are two alarm relays for local level control at the sensor site. This reduces the cost for running additional cables for local alarms.

Every significant parameter in the Model 201MS is field programmable. From range, alarm set-points, latching - non-latching status of alarms, to calibration gas concentration. Operators can program all these features with ease in the field.

When used with aTAC monitoring system, 12 VDC power will be provided by the monitor. If used as stand-alone unit, the 201MS can be powered from 12 to 24 VDC.

TAC's unique sensor can work in harsh environments present in oil rigs or in gas plants without affecting its performance.

Specifications:

Detection Method: Catalytic bead/ diffusion or Infrared.	Sensor Life: Guaranteed: One year; expected life three to five years in air.
Humidity Range: No effect up to 100%, non-condensed.	Signal Output: 4-20 mA
Response Time: • 0-50% LEL in 10 seconds with 100% LEL applied. • 1-90% LEL in 30 seconds with 100% LEL applied.	Sensitivity: No loss of sensitivity or response time due to lack of exposure to LEL; no poisoning effect due to 100% LEL exposure.
Clearing Time: 80% clear in less than 40 seconds; 100% clear in less than 3 minutes.	Electrical Classification: Class I, Div. I; Groups B, C & D.
Operating Temp.: -30º F to + 150º F	Interconnect Wiring: • 18 gauge, 3 conductors up to 500 ft. • 16 gauge, 3 conductors up to 1,600 ft. • 14 gauge, 3 conductors up to 3,000 ft.

Ordering Information:

201MS
Single Channel LEL Transmitter, 12-24 VDC, 4-20mA

201MS-R
Single Channel LEL Transmitter, 2 Relay Contacts, 12-24 VDC, 4-20mA

201XP-2
Two Channel LEL Transmitter, 12-24 VDC, 4-20 mA, Common SPDT Relay Contacts for Hi, Low & Fail

Also Available: Click here for more information

101MS
Single Channel H2S Transmitter, 12-24 VDC, 4-20mA

101MS-4R
Single Channel H2S Transmitter, 2 Relay Contacts, 12-24 VDC, 4-20mA

101XP-2
Two Channel H2S Transmitter, 12-24 VDC, 4-20 mA, Common SPDT Relay Contacts for Hi, Low & Fail

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