Comprehensive Product Summary – Dataforth MAQ20‑RSTC Thermocouple Input Module

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### 1. Product Overview

Product Name: MAQ20‑RSTC
Model Number: MAQ20‑RSTC
Series: MAQ®20 Industrial Data Acquisition and Control System
Article Number: MAQ20‑RSTC
Manufacturer: Dataforth Corporation, Tucson, Arizona, USA

Product Description:
The MAQ20‑RSTC is an 8‑channel, DIN‑rail‑mounted thermocouple input module designed for high‑accuracy measurement of Type R and Type S thermocouples. It is part of Dataforth’s MAQ®20 modular data acquisition and control platform, which provides distributed, high‑performance signal conditioning and I/O for industrial automation, process control, and data logging applications. The module connects directly to the MAQ20 backbone and communicates through the system’s Modbus‑compatible architecture.

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### 2. Key Features

- Eight Differential Thermocouple Inputs: Supports Type R and Type S thermocouples with individually configurable channels.
- High Accuracy: ±0.06 % of span typical accuracy; ±0.035 % conformity; ±0.25 °C cold‑junction compensation (CJC) accuracy at +25 °C.
- Wide Temperature Measurement Range:
- Type R: 0 °C to +1750 °C (default), 0 °C to +990 °C (optional)
- Type S: 0 °C to +1750 °C (default), 0 °C to +970 °C (optional)
- Robust Isolation: 1500 Vrms channel‑to‑bus isolation; ±3 V channel‑to‑channel isolation.
- Input Protection: 150 Vrms continuous field I/O protection; ANSI/IEEE C37.90.1 transient protection.
- High‑Performance Signal Conditioning: 100 dB common‑mode rejection (CMR) and 26 dB normal‑mode rejection (NMR) at 50/60 Hz.
- Per‑Channel Configuration: Each channel can be independently set for range, alarms, and averaging.
- Advanced Alarm Functions: High, Low, High‑High, and Low‑Low alarms with tracking or latching modes and programmable deadbands.
- Signal Averaging: Configurable averaging weight (2⁰ to 2¹⁵) for noise reduction and stable readings.
- Hot‑Swappable Module: Can be inserted or removed without system shutdown.
- Automatic Module Registration: The MAQ20 system automatically detects and registers modules upon installation.
- Wide Operating Range: –40 °C to +85 °C industrial temperature range.
- Compact DIN‑Rail Form Factor: 114.6 × 15.3 × 82.8 mm (H × W × D).
- Compliance: CE compliant; UL/CUL Class I, Division 2, Groups A–D pending; ATEX compliance pending.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Input Channels | 8 differential thermocouple inputs |
| Supported Thermocouple Types | Type R and Type S |
| Input Ranges | Type R: 0 °C to +1750 °C (default), 0 °C to +990 °C; Type S: 0 °C to +1750 °C (default), 0 °C to +970 °C |
| Accuracy | ±0.06 % span (includes conformity, hysteresis, repeatability) |
| Conformity | ±0.035 % span |
| Cold Junction Compensation (CJC) | ±0.25 °C @ 25 °C; ±1.0 °C @ –40 °C to +85 °C |
| Resolution | 0.020 % span |
| Zero Stability | ±15 ppm/°C |
| Span Stability | ±35 ppm/°C |
| Bandwidth | 3 Hz |
| Scan Rate | 20 channels per second |
| Input Protection | 150 Vrms continuous; ANSI/IEEE C37.90.1 transient |
| Isolation | 1500 Vrms channel‑to‑bus; ±3 V channel‑to‑channel |
| CMR / NMR | 100 dB @ 50/60 Hz / 26 dB @ 50/60 Hz |
| Open Input Response | Downscale < 5 s, flag set |
| Power Supply Current | 30 mA typical |
| Dimensions | 114.6 mm (H) × 15.3 mm (W) × 82.8 mm (D) (4.51 × 0.60 × 3.26 in) |
| Weight | Approx. 100 g (typical) |
| Operating Temperature | –40 °C to +85 °C |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 0 to 95 % RH, non‑condensing |
| EMC Emissions | EN 61000‑6‑4 (ISM Group 1, Class A) |
| EMC Immunity | EN 61000‑6‑2 (ISM Group 1, Performance A ±0.5 % span error) |
| Certifications | CE marked; UL/CUL Class I Div 2 pending; ATEX pending |
| Mounting | DIN rail mount to MAQ20 backbone |
| Enclosure | Industrial ventilated housing for DIN rail mounting |

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### 4. Functionality

The MAQ20‑RSTC module measures temperature signals from Type R and S thermocouples and converts them into high‑resolution digital data accessible via the MAQ20 system’s Modbus memory map. Each channel operates independently, allowing simultaneous measurement of multiple thermocouple types or ranges.

Operation:
- The module connects to the MAQ20 backbone, which distributes power and communication signals from the MAQ20‑COMx communications module.
- Upon insertion, the system automatically registers the module and assigns it a unique registration number.
- Data acquisition begins immediately, with readings stored locally and accessible through Modbus registers.
- Cold‑junction compensation is handled internally using four precision sensors to ensure accurate temperature readings across the full operating range.
- Hardware low‑pass filters reject 50/60 Hz noise, ensuring stable measurements in electrically noisy environments.

Applications:
- Industrial process monitoring and control
- Furnace and kiln temperature profiling
- Metallurgical and materials testing
- Energy and power generation systems
- Aerospace and high‑temperature research environments

Compatibility:
- Fully compatible with MAQ20‑COMx communications modules (Ethernet, USB, RS‑232/RS‑485).
- Integrates with Dataforth’s ReDAQ Shape and Configuration Software Tool for setup, visualization, and data logging.
- Modbus‑compliant memory map for integration with third‑party SCADA, PLC, or HMI systems.

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### 5. Components & Accessories

Included Components:
- MAQ20‑RSTC thermocouple input module
- Pluggable spring‑cage terminal block for field wiring (20 positions + shield terminals)
- Integrated DIN‑rail mounting clip

Terminal Assignments (per module):
- CH0 +IN / CH0 –IN / Shield
- CH1 +IN / CH1 –IN
- … up to CH7 +IN / CH7 –IN
- Four shield terminals connected to field‑side common (isolated from bus).

Optional Accessories:
- MAQ20‑BKPLx system backbones (various channel counts)
- MAQ20‑COMx communications modules
- MAQ20‑PWR3 power supply module for extended systems
- ReDAQ Shape Software (MAQ20‑940/941)
- Configuration Software Tool (MAQ20‑945)
- IPEmotion Software (MAQ20‑951)

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### 6. Installation & Setup

Mounting Requirements:
- Standard 35 mm DIN rail mounted flush on a continuous panel or plate.
- Modules can be installed in 3U vertical spacing increments.

Installation Steps:
1. Orient the module with the field connector facing outward.
2. Hook the top rear corner onto the DIN rail and rotate downward until it snaps into place.
3. Connect thermocouple leads to the terminal block according to channel assignments.
4. Verify the green PWR LED is lit and TX/RX LEDs indicate communication.

Removal:
Reverse the installation steps. The bottom clip can be released by hand or with a flat‑blade screwdriver in tight spaces.

System Setup:
- Install a MAQ20‑BKPLx backbone and a MAQ20‑COMx communications module.
- Apply 7–34 VDC power to the COMx module.
- Insert the MAQ20‑RSTC module; automatic registration occurs within 1 second.
- Configure channels, ranges, and alarms via software or Modbus registers.

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### 7. Performance & Capabilities

- Measurement Speed: 20 channels per second aggregate.
- Bandwidth: 3 Hz per channel.
- Noise Rejection: 100 dB CMR, 26 dB NMR at 50/60 Hz.
- Data Integrity: Over‑range on one channel does not affect others.
- Averaging: Configurable exponential averaging (2⁰–2¹⁵ samples).
- Alarms: Four levels (High, Low, High‑High, Low‑Low) with tracking or latching modes.
- Reset Functions: Standard Reset (user‑defined state) and Reset‑to‑Default (factory settings).
- LED Indicators: PWR (blue), STAT (green), TX/RX (yellow), ALM (red).
- Reliability: Brown‑out and watchdog protection ensure predictable operation.

Limitations:
- Designed exclusively for Type R and S thermocouples; other types require different MAQ20‑xTC models.
- Not intended for life‑support or critical‑safety applications.

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### 8. Standards & Compliance

- Quality Management: ISO 9001:2008‑registered QMS.
- Electrical Safety: 1500 Vrms isolation; ANSI/IEEE C37.90.1 transient protection.
- EMC Compliance: EN 61000‑6‑4 (Emissions, ISM Group 1 Class A); EN 61000‑6‑2 (Immunity, Performance A).
- Environmental: Heavy industrial CE compliance; ATEX and UL Class I Div 2 pending.
- Regulatory Markings: CE mark for industrial use.
- Hazardous Location Rating: Designed for Class I, Division 2 hazardous locations.

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### 9. Additional Information

Warranty:
- Hardware: 1 year from date of delivery.
- Software: 30 days from delivery.
- Special Products: 60 days.
Dataforth’s obligation is limited to repair, replacement, or refund of the purchase price for defective products returned within the warranty period.

Repair and Returns:
- Contact Dataforth Customer Service at (520) 741‑1404 or 1‑800‑444‑7644 for an RMA number.
- Return products prepaid to:
Dataforth Corporation, 3331 E. Hemisphere Loop, Tucson, AZ 85706 USA

Support and Resources:
- Technical Support Email: techinfo@dataforth.com
- Website: [www.dataforth.com](https://www.dataforth.com)
- Software Tools: ReDAQ Shape (HMI design and runtime), Configuration Software Tool, IPEmotion integration.
- Documentation: MA1047 Hardware User Manual, MA1036 Quick Start Guide, MA1037 Configuration Software Manual.

Maintenance:
Modules are hot‑swappable; replacement or expansion requires minimal downtime. Automatic registration ensures seamless integration of new modules.

Safety and Handling:
- Use ESD precautions during installation and handling.
- Modules are shipped in anti‑static packaging.
- Not authorized for life‑support or critical applications where failure could cause injury or death.

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### Summary

The Dataforth MAQ20‑RSTC is a precision, industrial‑grade thermocouple input module engineered for demanding temperature measurement applications using Type R and S sensors. It delivers exceptional accuracy, robust isolation, and flexible configuration within the modular MAQ20 data acquisition ecosystem. With its 8 independent channels, advanced alarm and averaging functions, and rugged DIN‑rail design, the MAQ20‑RSTC provides reliable performance in harsh industrial environments from –40 °C to +85 °C.

Fully compliant with industrial EMC and safety standards, the module integrates seamlessly with Dataforth’s communications and software tools to form a scalable, high‑density data acquisition system capable of handling up to 384 channels per rack. Its combination of accuracy, ruggedness, and ease of integration makes it an ideal solution for process control, research, and industrial automation applications requiring precise high‑temperature measurement.