Name: Eaton MTL831C 16-Channel Hazardous-Area Analog Transmitter | Qiming Automation
Brand: EATON
SKU: MTL831C
Price: 1335.00 CNY
Availability: InStock

Description

Key Technical Specifications

Parameter	Value
Model	MTL831C
Manufacturer	Eaton / MTL
Product family	MTL830C Temperature Multiplexer System
Function	Analog transmitter for hazardous-area sensor inputs
Input channels	16, software-configurable mixed inputs
Supported inputs	Thermocouples, mV signals, 2-, 3-, or 4-wire RTDs, potentiometers
mV input range	Up to ±100 mV
RTD range	Pt100: −200 to +850°C; Cu50: −200 to +200°C
Potentiometer range	Up to 550 Ω
Communication	Single shielded twisted-pair data highway to MTL838C receiver
Power	Loop-powered through the data highway; no separate hazardous-area supply
Multi-transmitter capability	1 or 2 MTL831C transmitters per MTL838C receiver
Typical response time	500 ms from input to Modbus register
Intrinsic-safety parameters	Ii = 250 mA; Pi = 1.2 W; Ci = 0; Li = 0
Ambient operating temperature	−40 to +70°C
Storage temperature	−40 to +85°C
Weight	0.26 kg
Terminals	Fixed screw terminals
Certifications	ATEX, IECEx, FM
Hazardous-area installation	Suitable for Zone 0 hazardous areas when installed per certification requirements

The MTL831C requires an MTL838C or MTL838C-MBT receiver. For intrinsically safe installations, use an approved safe-area galvanic isolator such as the MTL5553 or MTL5053.

Product Introduction

The Eaton MTL831C is a 16-channel intrinsically safe analog transmitter for the MTL830C temperature multiplexer system. It accepts thermocouple, millivolt, RTD, and potentiometer signals from hazardous-area field sensors and transfers them to a safe-area MTL838C receiver over one shielded twisted-pair cable.

Because the data highway both powers and communicates with the transmitter, it eliminates a separate field power supply. The 16 channels are software-configurable, making the MTL831C suitable for mixed TC, RTD, mV, and potentiometer measurements feeding DCS, PLC, or SCADA systems through the receiver’s Modbus interface.

MTL831C

Troubleshooting Quick Reference

Symptom	Possible Cause	Relevance to this Part	Quick Check Method	Recommendation
No communication to MTL838C	Reversed data-highway polarity, broken cable, isolator fault	✅ High	Verify + and − polarity at transmitter, isolator, and receiver; test shielded twisted-pair continuity	Correct wiring and isolator before replacing the MTL831C
All 16 channels invalid or open	Transmitter not receiving power through the data highway	✅ High	Confirm MTL838C receiver configuration and isolator output; measure data-highway voltage/current	Check MTL5553/MTL5053 isolator and receiver configuration
One channel reads open	Field sensor, extension lead, or terminal fault	❌ Low	Measure sensor resistance or mV directly at the MTL831C terminals	Repair or replace the field sensor first
Incorrect temperature reading	Wrong channel type, TC type, RTD wiring, or range configuration	✅ Medium	Compare configured sensor type and range with the actual field device	Reconfigure the channel in MTL83xC software
Intermittent readings	Loose screw terminal, damaged shield, or ground-loop issue	✅ Medium	Re-torque terminals; inspect cable shield and grounding arrangement	Re-terminate cable and correct shield grounding
Second transmitter not recognized	Duplicate or incorrect transmitter address	✅ High	Check address jumpering, especially for the second MTL831C	Set the second transmitter address jumper between terminals 7 and 8 (A and S) as required
Corrosion, moisture, or cracked housing	Enclosure sealing or cable-gland failure	✅ High	Inspect housing, terminals, glands, and cable entries	Replace the transmitter and correct enclosure sealing

❗ Do not replace the MTL831C based on one bad channel alone. Sensor wiring, loose terminals, and incorrect MTL838C configuration cause most single-channel problems. If the fault persists, send photos of the transmitter, field wiring, MTL838C configuration, and diagnostic logs to technical support.

Frequently Asked Questions

Can I use the Eaton MTL831C without an MTL838C receiver?
No. The MTL831C is the field-side transmitter only. It needs an MTL838C or MTL838C-MBT receiver in the safe area for configuration, data collection, and the Modbus interface to your control system.

Can one MTL838C receiver support two MTL831C transmitters?
Yes. One MTL838C supports one or two MTL831C transmitters, for up to 32 total sensor inputs. The second transmitter must have its address configured correctly.

Does the MTL831C need a separate 24 V DC field power supply?
No. It is loop-powered through the data highway. That reduces hazardous-area wiring, but the data-highway cable, isolator, and receiver must be correctly selected and configured.

Can I install the MTL831C in a Zone 0 hazardous area?
Yes. It is intrinsically safe and carries ATEX, IECEx, and FM certification. The complete installation must follow the applicable certificate and MTL system documentation, including use of an approved safe-area isolator.

Can I mix thermocouples, RTDs, and potentiometers on the same unit?
Yes. The 16 channels are software-configurable. Confirm the sensor type, wiring format, and measurement range in the MTL838C configuration before commissioning.

Is the MTL831C a direct replacement for an MTL831B?
For MTL830B-to-MTL830C system migrations, Eaton’s guidance is to replace each MTL831B with an MTL831C and move the sensor and data-highway wiring to the corresponding terminals. Verify address jumpering and receiver configuration before startup.

Why is New Surplus less expensive than factory-new stock?
New Surplus means genuine Eaton/MTL inventory manufactured earlier but not installed or commissioned. We inspect, document, and functionally verify each unit before shipment. It is not used, repaired, or refurbished stock unless clearly stated on the product page.