Comprehensive Product Summary – Dataforth MAQ20-JTC Thermocouple Input Module

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### 1. Product Overview

Product Name: MAQ20-JTC
Model Number: MAQ20-JTC
Series: MAQ®20 Industrial Data Acquisition and Control System
Article Number: MAQ20-JTC
Manufacturer: Dataforth Corporation
Product Type: 8-Channel Type J Thermocouple Input Module
Mounting: DIN Rail, designed for integration into the MAQ20 system backbone

The MAQ20-JTC is part of Dataforth’s MAQ®20 modular data acquisition and control platform, engineered for high-performance industrial signal conditioning and measurement. It provides eight differential thermocouple input channels specifically designed for Type J sensors, offering precision temperature measurement, robust isolation, and advanced alarm and averaging functions. The module is intended for use in rugged industrial environments and integrates seamlessly with other MAQ20 modules through a DIN rail-mounted backbone.

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### 2. Key Features

- High-Accuracy Measurement: ±0.06% of span accuracy with ±0.035% conformity and ±0.25°C cold junction compensation (CJC) accuracy at 25°C.
- Wide Temperature Range: Supports Type J thermocouples with selectable ranges:
- Default: –100°C to +760°C
- Optional: –100°C to +393°C or –100°C to +199°C
- Channel-to-Bus Isolation: 1500Vrms isolation for one minute ensures signal integrity and safety.
- Channel Independence: Over-range or fault on one channel does not affect others.
- High Input Protection: 150Vrms continuous field I/O protection and ANSI/IEEE C37.90.1 transient protection.
- Industrial-Grade Design: Operates from –40°C to +85°C with 0–95% non-condensing humidity tolerance.
- Advanced Alarm System: Configurable high, low, high-high, and low-low alarms per channel with tracking or latching modes.
- Signal Averaging: Per-channel configurable averaging with exponential weighting (2^x, x = 0–15).
- Hot-Swappable: Modules can be inserted or removed without system shutdown.
- Automatic Module Registration: The system auto-detects and assigns registration numbers to modules.
- Modbus-Compatible: Fully compatible with Modbus memory mapping for easy integration.
- Software Support: Compatible with Dataforth’s ReDAQ Shape and MAQ20 Configuration Software for setup, monitoring, and control.
- Compact Form Factor: High-density design allows up to 24 I/O modules (384 channels) per 19” rack width.
- Compliance: CE compliant, UL/CUL listing and ATEX certification pending.

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### 3. Technical Specifications

Physical Dimensions:
- Height: 114.6 mm (4.51 in)
- Width: 15.3 mm (0.60 in)
- Depth: 82.8 mm (3.26 in)

Weight: Approximately 150 g (typical module weight)

Material: Industrial-grade thermoplastic housing with integrated ventilation slots for thermal management.

Electrical & Performance:
- Input Type: Type J thermocouple, differential input
- Input Range Options:
- Range 0 (default): –100°C to +760°C
- Range 1: –100°C to +393°C
- Range 2: –100°C to +199°C
- Resolution: 0.020% of span
- Accuracy: ±0.06% of span (includes conformity, hysteresis, repeatability)
- Cold Junction Compensation (CJC): ±0.25°C at 25°C, ±1.0°C from –40°C to +85°C
- Common Mode Voltage (CMV):
- Channel-to-Bus: 1500Vrms for 1 minute
- Channel-to-Channel: ±3V
- Common Mode Rejection (CMR): 100dB @ 50/60Hz
- Normal Mode Rejection (NMR): 26dB @ 50/60Hz
- Bandwidth: 3Hz
- Scan Rate: 20 channels per second
- Power Supply: 7–34VDC (provided via MAQ20-COMx module)
- Current Consumption: 30mA typical

Environmental:
- Operating Temperature: –40°C to +85°C
- Storage Temperature: –40°C to +85°C
- Relative Humidity: 0–95%, non-condensing

Protection:
- Continuous Input Protection: 150Vrms
- Transient Protection: ANSI/IEEE C37.90.1
- Open Input Response: Downscale <5s, flag set

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### 4. Functionality

The MAQ20-JTC module measures temperature using Type J thermocouples across eight differential input channels. Each channel is individually configurable for input range, alarm thresholds, and averaging parameters. The module performs cold junction compensation internally using four precision sensors to ensure accurate readings across the full operating temperature range.

Use Cases and Applications:
- Industrial process monitoring and control
- Furnace and kiln temperature measurement
- HVAC and environmental testing systems
- Energy management and power generation monitoring
- Laboratory and R&D instrumentation
- Remote data acquisition in hazardous or high-noise environments

Compatibility:
- Fully compatible with MAQ20 backbones and communication modules (MAQ20-COMx).
- Integrates with Modbus-compatible SCADA, PLC, and HMI systems.
- Supported by Dataforth’s ReDAQ Shape and Configuration Software for setup, calibration, and data visualization.

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### 5. Components & Accessories

Included Components:
- MAQ20-JTC module
- Pluggable spring-cage terminal block for field wiring
- Integrated DIN rail mounting clip

Terminal Block Connections (Top to Bottom):
1. CH0 +IN
2. CH0 –IN
3. Shield
4. CH1 +IN
5. CH1 –IN
6. CH2 +IN
7. CH2 –IN
8. Shield
9. CH3 +IN
10. CH3 –IN
11. CH4 +IN
12. CH4 –IN
13. Shield
14. CH5 +IN
15. CH5 –IN
16. CH6 +IN
17. CH6 –IN
18. Shield
19. CH7 +IN
20. CH7 –IN

Optional Accessories:
- MAQ20-BKPLx system backbones (various channel capacities)
- MAQ20-COMx communication modules (Ethernet, USB, RS-232/RS-485)
- MAQ20-PWR3 power supply module for extended systems
- ReDAQ Shape software (MAQ20-940/941)
- Configuration Software Tool (MAQ20-945)

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### 6. Installation & Setup

Mounting Requirements:
- Standard 35mm DIN rail
- Can be mounted on continuous flat panels or plates
- 3U vertical spacing for multi-row installations

Installation Steps:
1. Align the module with the DIN rail and slide downward to engage the hook.
2. Rotate the module until it snaps into place.
3. Connect thermocouple leads to the terminal block according to channel assignments.
4. Connect the backbone to the MAQ20-COMx communication module.
5. Apply system power (7–34VDC).

Setup Process:
- Upon power-up, the system automatically registers the module and assigns a registration number.
- Configuration parameters (range, alarms, averaging) can be set via Modbus registers or Dataforth software tools.
- Modules are hot-swappable and automatically re-registered when replaced.

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### 7. Performance & Capabilities

- Measurement Speed: 20 channels per second (aggregate).
- Accuracy: ±0.06% of span; ±0.035% conformity.
- CJC Accuracy: ±0.25°C at 25°C.
- Stability:
- Zero drift: ±15ppm/°C
- Span drift: ±35ppm/°C
- Isolation: 1500Vrms channel-to-bus, 3V channel-to-channel.
- Noise Rejection: 100dB CMR, 26dB NMR at 50/60Hz.
- Alarm Response: Configurable per channel with programmable deadbands.
- Open Input Detection: Downscale indication within 5 seconds.
- Data Logging: Up to 4GB of logged data transferable via FTP when used with MAQ20-COMx.

Limitations:
- Designed for Type J thermocouples only (other thermocouple types require corresponding MAQ20-xTC models).
- Requires MAQ20-COMx communication module for operation.

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### 8. Standards & Compliance

- Quality Management: ISO9001:2008 Registered QMS
- Electrical Safety: UL/CUL Listing pending
- Hazardous Location: Designed for Class I, Division 2, Groups A, B, C, D (pending certification)
- EMC Compliance:
- Emissions: EN61000-6-4, ISM Group 1, Class A (radiated and conducted)
- Immunity: EN61000-6-2, ISM Group 1, RF Performance A (±0.5% span error), ESD/EFT Performance B
- Transient Protection: ANSI/IEEE C37.90.1
- CE Marking: Compliant
- ATEX Compliance: Pending

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### 9. Additional Information

Warranty:
- Standard hardware warranty: 1 year from date of delivery
- Software warranty: 30 days from delivery
- Special products: 60 days
- Repair warranty: 90 days or remainder of original warranty period

Warranty Coverage:
Covers defects in materials and workmanship under normal use. Excludes damage from misuse, improper installation, or operation beyond specified limits.

Support & Service:
- Technical Support: techinfo@dataforth.com
- Phone: +1 520-741-1404 or 1-800-444-7644 (toll-free, USA)
- Fax: +1 520-741-0762
- Website: [www.dataforth.com](http://www.dataforth.com)
- Mailing Address:
Dataforth Corporation
3331 E. Hemisphere Loop
Tucson, AZ 85706 USA

Return & Repair Policy:
- Obtain a Return Material Authorization (RMA) before returning products.
- Include model number, serial number, contact details, and repair instructions.
- Ship prepaid to Dataforth’s Tucson facility.

Maintenance:
- Modules are hot-swappable and automatically re-registered upon replacement.
- Regularly verify LED indicators for power (blue), status (green), communication (yellow), and alarm (red).
- Use ESD precautions during handling.

Software Tools:
- ReDAQ Shape (MAQ20-940/941): Graphical HMI design and runtime environment.
- MAQ20 Configuration Software Tool (MAQ20-945): For setup, calibration, and Modbus register management.
- IPEMotion (MAQ20-951): Multi-vendor, multi-language integration platform.

Firmware & Updates:
- Firmware updates available via Dataforth’s website.
- Modules support EEPROM storage for configuration retention.

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### Summary

The Dataforth MAQ20-JTC is a precision, industrial-grade thermocouple input module designed for high-performance temperature measurement in demanding environments. With eight differential Type J inputs, robust isolation, configurable alarms, and advanced averaging, it provides reliable and accurate data acquisition for process control and monitoring applications. Its modular design, automatic registration, and compatibility with the MAQ20 ecosystem make it ideal for scalable, distributed data acquisition systems.

Engineered under ISO9001:2008 standards, the MAQ20-JTC exemplifies Dataforth’s commitment to quality, performance, and long-term reliability in industrial instrumentation.