Comprehensive Product Summary – Dataforth MAQ20‑TTC Thermocouple Input Module

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### 1. Product Overview

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

The MAQ20‑TTC is an eight‑channel, Type T thermocouple input module designed for the MAQ20® modular data acquisition and control platform. It provides high‑accuracy temperature measurement in industrial environments and mounts directly to a DIN‑rail backbone within the MAQ20 system. The module is part of Dataforth’s Instrument Class® family of rugged, high‑performance signal conditioning and data acquisition products.

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### 2. Key Features

- Eight Differential Thermocouple Inputs: Supports Type T thermocouples with per‑channel configuration for range, alarms, and averaging.
- High Accuracy: ±0.06 % of span typical accuracy; ±0.035 % conformity; ±0.25 °C cold‑junction compensation (CJC) accuracy at 25 °C.
- Cold Junction Compensation: Four internal sensors provide ±1.0 °C accuracy across the full operating range (–40 °C to +85 °C).
- Robust Isolation: 1500 Vrms channel‑to‑bus isolation for one minute; 150 Vrms continuous field I/O protection.
- Transient Protection: ANSI/IEEE C37.90.1 compliance for surge and transient immunity.
- Wide Operating Range: –40 °C to +85 °C industrial temperature rating; 0 – 95 % RH non‑condensing.
- High Density: Compact 15.3 mm width allows up to 24 modules (384 channels) per 19‑inch rack width.
- Hot‑Swappable: Modules can be inserted or removed under power; automatic registration and configuration.
- Advanced Alarms: Four independent alarm levels per channel (High, High‑High, Low, Low‑Low) with tracking or latching behavior.
- Signal Averaging: Configurable exponential averaging per channel with weighting factors 2⁰ – 2¹⁵.
- Noise Rejection: Hardware low‑pass filtering and 100 dB common‑mode rejection at 50/60 Hz.
- Modbus Compatibility: Fully addressable via Modbus memory map; accessible through MAQ20‑COMx communication modules.
- Software Integration: Supported by Dataforth ReDAQ Shape HMI, MAQ20 Configuration Tool, and IPEmotion software.
- CE and UL Compliance: Meets EN61000‑6‑2/‑6‑4 heavy‑industrial EMC standards; ATEX and UL Class I Div 2 certifications pending.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Input Type | Type T thermocouple, differential |
| Number of Channels | 8 |
| Input Ranges | –100 °C to +400 °C (default); –100 °C to +220 °C |
| Input Protection | 150 Vrms continuous; ANSI/IEEE C37.90.1 transient |
| Channel‑to‑Bus Isolation | 1500 Vrms, 1 minute |
| Channel‑to‑Channel Isolation | ±3 V |
| Common‑Mode Rejection (CMR) | 100 dB @ 50/60 Hz |
| Normal‑Mode Rejection (NMR) | 26 dB @ 50/60 Hz |
| Accuracy | ±0.06 % span (includes conformity, hysteresis, repeatability) |
| Conformity | ±0.035 % span |
| Cold Junction Compensation | ±0.25 °C @ 25 °C; ±1.0 °C @ –40 to +85 °C |
| Resolution | 0.020 % span |
| Zero Tempco | ±15 ppm/°C |
| Span Tempco | ±35 ppm/°C |
| Bandwidth | 3 Hz |
| Scan Rate | 20 channels/s |
| Open Input Response | Downscale < 5 s, flag set |
| Power Supply Current | 30 mA typical |
| Dimensions (H × W × D) | 114.6 × 15.3 × 82.8 mm (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 – 95 % RH, non‑condensing |
| EMC Emissions | EN61000‑6‑4 Class A, ISM Group 1 |
| EMC Immunity | EN61000‑6‑2 Performance A/B |
| Certifications | CE (Heavy Industrial), ATEX pending, UL/CUL Class I Div 2 pending |

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### 4. Functionality

The MAQ20‑TTC module measures temperature from up to eight Type T thermocouples. Each channel is differential and individually configurable for range, alarm thresholds, and averaging. The module performs cold‑junction compensation internally and linearizes the thermocouple signal to deliver accurate temperature readings in engineering units.

Data acquisition occurs locally within the module; results are stored in Modbus‑mapped registers accessible through the MAQ20‑COMx communication module via Ethernet, USB, RS‑232, or RS‑485. The module supports both local and remote backbone mounting, enabling distributed measurement architectures.

Typical Applications:
- Industrial process temperature monitoring
- Furnace and oven control
- Environmental and climatic testing
- Energy management and HVAC systems
- Laboratory and R&D data logging
- Remote telemetry and SCADA integration

Compatibility:
Fully compatible with all MAQ20 system components, including MAQ20‑BKPLx backbones, MAQ20‑COMx communication modules, and MAQ20‑PWR3 power supplies. Software interfaces include ReDAQ Shape, MAQ20 Configuration Tool, and IPEmotion.

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### 5. Components & Accessories

Included Items:
- MAQ20‑TTC module
- Pluggable spring‑cage terminal block (20 positions)
- Integrated DIN‑rail mounting clip

Terminal Assignments (Top → 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

Shield terminals connect to field‑side common and are isolated from the system bus. External grounding may be added if required.

Optional Accessories:
- MAQ20‑BKPLx backbones (various channel counts)
- MAQ20‑COMx communication modules
- MAQ20‑PWR3 auxiliary power supply module
- ReDAQ Shape and Configuration Tool software packages

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### 6. Installation & Setup

Mounting:
The module snaps onto a standard DIN rail. Align the upper rear hook with the rail, slide downward, and rotate until it clicks into place. Removal is accomplished by releasing the lower clip manually or with a flat‑blade screwdriver.

System Integration Steps:
1. Install a MAQ20‑BKPLx backbone on the DIN rail.
2. Insert a MAQ20‑COMx communication module in the leftmost slot and apply 7–34 V DC power.
3. Insert the MAQ20‑TTC module into any available backbone position.
4. Observe the blue PWR LED and green STAT LED to confirm registration.
5. Connect thermocouple wiring to the terminal block.

Automatic Registration:
Upon insertion, the system assigns a sequential registration number and begins data acquisition. Modules can be added or replaced while powered (hot‑swappable). Registration numbers remain persistent through power cycles unless modules are added or removed.

Configuration:
Channel ranges, alarms, and averaging are configured via Modbus registers or through Dataforth software tools. Settings can be stored in EEPROM for retention after reset or power loss.

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### 7. Performance & Capabilities

- Measurement Range: –100 °C to +400 °C (default); optional –100 °C to +220 °C.
- Resolution: 0.0977 °C per count (default range).
- Sampling Rate: 20 channels per second aggregate.
- Bandwidth: 3 Hz analog input filter.
- Accuracy: ±0.06 % span; includes linearization and CJC.
- CJC Accuracy: ±0.25 °C @ 25 °C; ±1.0 °C over –40 to +85 °C.
- Isolation: 1500 Vrms channel‑to‑bus; 150 Vrms continuous field protection.
- Noise Rejection: 100 dB CMR, 26 dB NMR @ 50/60 Hz.
- Alarm Response: Four independent thresholds per channel; tracking or latching; LED indication.
- Open‑Input Detection: Downscale within 5 s with flag set.
- Power Consumption: 30 mA typical from system bus.
- Reliability: Watchdog and brown‑out detection ensure predictable recovery.

Limitations:
Designed exclusively for Type T thermocouples; other thermocouple types require corresponding MAQ20‑xTC models (J, K, R/S). Not intended for life‑support or critical safety applications.

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### 8. Standards & Compliance

- Quality System: ISO 9001:2008‑registered manufacturing.
- EMC Emissions: EN61000‑6‑4 (ISM Group 1, Class A).
- EMC Immunity: EN61000‑6‑2 (Performance A/B).
- Transient Protection: ANSI/IEEE C37.90.1.
- Safety: UL/CUL Class I Division 2 Groups A–D (pending).
- ATEX: Compliance pending for hazardous‑location use.
- CE Mark: Heavy‑industrial environment compliance.
- Environmental: Operating –40 °C to +85 °C; 0–95 % RH non‑condensing.

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### 9. Additional Information

Warranty:
- Hardware: 1 year from initial delivery.
- Software: 30 days.
- Special products: 60 days.
Dataforth’s obligation is limited to repair, replacement, or refund of purchase price for defects in materials or workmanship. Warranty excludes misuse, improper installation, or operation beyond specified limits.

Repair & Returns:
Obtain a Return Material Authorization (RMA) before shipping. Include model and serial numbers, contact information, and repair instructions. Ship prepaid to:

Dataforth Corporation
3331 E. Hemisphere Loop
Tucson, AZ 85706 USA

Support Contacts:
- Technical Support: techinfo@dataforth.com
- Website: [www.dataforth.com](https://www.dataforth.com)
- Phone: +1 520‑741‑1404 / 1‑800‑444‑7644 (toll‑free US)
- Fax: +1 520‑741‑0762

Maintenance:
Modules require minimal maintenance. Periodically verify LED indicators and communication activity. Modules can be replaced individually without system shutdown.

Firmware & Updates:
Firmware revisions are identified in module registers (addresses 35–40). Updates and errata are available on Dataforth’s website.

Safety & Handling:
Modules are shipped in ESD‑protective packaging. Use proper grounding during installation. The product is not rated for life‑support or nuclear applications.

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### Summary

The Dataforth MAQ20‑TTC is a precision eight‑channel Type T thermocouple input module engineered for demanding industrial data acquisition systems. It combines high accuracy, robust isolation, and flexible configuration within a compact DIN‑rail form factor. Integrated cold‑junction compensation, advanced alarm management, and per‑channel averaging make it ideal for process monitoring and control applications requiring reliable temperature measurement. When integrated into the MAQ20® platform, the MAQ20‑TTC delivers scalable, distributed, and easily configurable temperature acquisition with full Modbus compatibility and comprehensive software support.