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Carbon Monoxide (CO) Gas Monitor - ST-48

• Model ST-48EC: EC sensor input (see order guide) with 2-Wire 4-20mA output.
• Model ST-48EC-CAT: Dual EC & LEL sensor inputs (both EC & LEL inputs available).
• Model ST-48EC-I: 4-20mA into 10 ohms input impedance.
• Accuracy: ±5% of full scale ± 1 count.
• Ambient Temperature Range: -40 - 60°C
• 10 - 30 VDC at less than .75 watts in 2-Wire 4-20mA.
• 10 - 30 VDC at less than 3 watts in 3-Wire 4-20mA with Relays.

Model Number: ST-48
Data Sheet:

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Product Specification

Carbon Monoxide Gas Transmitter

Carbon Monoxide Monitor (CO Monitor) Product Summary
The carbon monoxide gas monitor is used for safety in laboratories, or facilities requiring safety detection of CO. The CO gas detector comes with 2 alarm relays with signal to horn/strobe, building systems, etc. There are built-in visual alarms with bright LED's, a 4-20mA analog output, and 24/7 supervised electronics which continuously checks sensor.

Carbon Monoxide Monitor (CO Monitor) Features:
• Accepts 4-20mA, electrochemical and bridge style sensors into single or dual channels. Dual model has two readouts and 4-20mA outputs
• Wireless and 2-wire 4-20mA models for electrochemical sensor
• NRTL / ATEX certifications
• "Smart" sensor interface allows sensor type, range, calibration and other variables be stored in sensor
• Allows "one man" sensor calibration in hazardous areas without area declassification
• Requires only a simple magnetic wand. No other special electronic devices are needed
• LCD readout is .6" engineering units and graphically as a 30- minute trend or bar-graph
• Five front panel alarm LED indicators for A1 , A2 , Fail, IN CAL & RS-485 are standard
• Available options: HIGH - WARN - FAULT alarm contacts with RS-485 Modbus, isolated 4-20mA, quick connect cables suitable for Div 2, magnetic mounting
• 4-20mA output sends constant "In Cal" signal during calibrations
• User programmable "Power-Up" & "Post Cal" Delay locks output at zero during sensor stabilization
• Standard "Fault Supervision" circuitry continuously monitors for failed sensor. 4-20mA output transmits low mA during failures.
• Security mode allows locking of critical parameters.
• The NEMA 7 enclosure also available in stainless-steel.

Carbon Monoxide Monitor (CO Monitor) Specifications

ST-48 Inputs By Model
Model ST-48EC:	EC sensor input (see order guide) with 2-Wire 4-20mA output.
Model ST-48EC-CAT:	Dual EC & LEL sensor inputs (both EC & LEL inputs available).
Model ST-48EC-I:	4-20mA into 10 ohms input impedance.
Analog Outputs
ST-48EC has standard 2-Wire 4-20mA current sink output. (2-Wire 4-20 not available with ST-48EC-CAT or 10-0234 option)
ST-48EC-CAT models have 3-Wire 4-20mA current source output. With nominal 24VDC power supply, 2-Wire max loop R is 500 ohms and 3-Wire max loop R is 750 ohms.
10-0234 Relays / RS-485 Modbus (Optional)
Relays are Form C 5AMP @ 30VDC & 240VAC RESISTIVE. RS-485 is 2-Wire Modbus RTU.
NRTL CSA Approvals (File # 219995)
ST-48 with 10-0247 is Div. 1 & 2 Gr. B,C,D Exia. Suitable for Explosion Proof and Intrinsically Safe installations.
ST-48IS 10-0247IS is Div. 1 & 2 Gr. A,B,C,D. Suitable for Intrinsically Safe installations only.
Important: Intrinsically Safe installations require IS barrier # 10-0263 (MTL 7787P+) or equivalent.
ATEX certified with only 10-2072 sensor head.
Display
64 x 128 pixel LCD displays 30-minute trend, bar-graph & large engineering units. Backlight active in 3-wire 4-20mA mode.
Accuracy	±5% of full scale ± 1 count.
Ambient Temperature Range	-40 - 60 degrees C
Temperature Drift	Less than .1% per degree Cover ambient temperature range.
Power Supply
10 - 30 VDC at less than .75 watts in 2-Wire 4-20mA.
10 - 30 VDC at less than 3 watts in 3-Wire 4-20mA with Relays.
Housing	Instrument enclosure suitable for Cl. 1, Div. 1 & 2, Gr. B,C,D