The EX-5100 incorporates a pellistor or catalytic bead sensor. This sensor consists of a matched pair of elements, one active and the other for compensation. The active bead is coated with a catalyst that, when in contact with a combustible hydrocarbon or solvent, causes the gas or vapor to “burn” or oxidize at concentrations below the Lower Explosive Limit (LEL). This oxidization process raises the temperature of the active bead and increases the resistance of the internal wire coil. The second bead does not have the catalytic coating and provides compensation for environmental conditions including temperature and humidity. When these elements are connected in
a Wheatstone bridge type circuit, a useable signal is produced that is proportional to the gas concentration. The transmitter is 24 Vdc loop powered and provides a 4-20 mA output signal that can be connected to a controller, PLC or similar instrumentation.

General Specifications

Transmitter and General Specifications
Voltage24 Vdc, loop powered
PowerMaximum 7.5 watts at 24 volts
Output4-20 mA
Installation3-wire (24 Vdc, ground, 4-20 mA), normally 16 to 18 AWG (1.5 to 0.75 mm2) depending upon distance, typically up to 300 ft. (100 meters)
Connection1/2 inch NPT female. Sealing fitting available as an option.
Display8-character, single-line, backlit LCD
Range0-100% LEL
Alarm Indicators3 LEDs, independent of 4-20mA output
Menu/ Calibration ButtonsMagnet actuated switches
Sensor Specifications
Range0-100% LEL
Accuracy+/- 1% LEL (CH4)
Maximum Long Term Drift
Span<+/-1% LEL/Month
Zero1% LEL/year
Response TimeT50: 12 sec T90: 40 sec
Temperature Range-20° C to +70° C
Humidity0-100% RH, non-condensing
Humidity Response+/-2% LEL
LinearityEffectively Linear to 60% LEL
Approvals and Certifications
Sensor HeadATEX Approved: CESI 01 ATEX 066 U
EnclosureClass I, Groups B, C, D Class II, Groups E, F, G CENELEC: EEx d IIC, IP66
CertificationsFM Standard 3615 CSA Standard C22.2 No. 30 UL Standard 1203 DEMKO CENELEC Standard EN 50014, 50018

Order Form