Comprehensive Product Summary – Dataforth MAQ20-KTC Thermocouple Input Module

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### 1. Product Overview

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

The MAQ20-KTC is an eight-channel, Type K thermocouple input module designed for precision industrial data acquisition within the MAQ®20 modular system. It is DIN rail–mounted and connects directly to the MAQ20 system backbone, providing high-performance, isolated thermocouple measurement capabilities for process control and monitoring applications.

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### 2. Key Features

- Eight Differential Thermocouple Inputs: Supports Type K thermocouples with individually configurable input ranges per channel.
- High Accuracy and Stability: ±0.06% span accuracy and ±0.035% conformity; cold junction compensation (CJC) accuracy of ±0.25°C at 25°C and ±1.0°C across the full -40°C to +85°C operating range.
- Robust Electrical Isolation: 1500Vrms channel-to-bus isolation and 150Vrms continuous field I/O protection.
- Industrial-Grade Protection: ANSI/IEEE C37.90.1 transient protection and 240Vrms continuous field I/O protection.
- Wide Operating Range: -40°C to +85°C ambient temperature, 0–95% non-condensing humidity.
- High Channel Density: Eight channels in a compact 114.6 × 82.8 × 15.3 mm DIN-rail form factor.
- Advanced Alarm System: Four alarm types per channel (High, High-High, Low, Low-Low) with configurable deadbands and latching/tracking modes.
- Signal Averaging and Filtering: Per-channel averaging with programmable weighting (2⁰–2¹⁵) and hardware low-pass filtering for 50/60Hz noise rejection.
- Hot-Swappable Module: Can be inserted or removed without system shutdown; automatic registration and configuration.
- Distributed Processing: Each module performs local signal conditioning, linearization, and data storage.
- Modbus-Compatible: Fully addressable via Modbus memory map for seamless integration with industrial control systems.
- CE Compliant and ATEX Pending: Designed for heavy industrial environments and hazardous locations (Class I, Division 2).

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### 3. Technical Specifications

Input Type: Type K thermocouple
Number of Channels: 8 differential inputs
Input Ranges (Selectable per Channel):
- Range 0 (default): -100°C to +1350°C
- Range 1: -100°C to +651°C
- Range 2: -100°C to +332°C

Accuracy: ±0.06% of span (includes conformity, hysteresis, repeatability; excludes CJC)
Conformity: ±0.035% of span
Cold Junction Compensation: ±0.25°C @ 25°C; ±1.0°C from -40°C to +85°C
Resolution: 0.020% of span
Zero Stability: ±15ppm/°C
Span Stability: ±35ppm/°C
Bandwidth: 3Hz
Scan Rate: 20 channels per second
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
Input Protection: 150Vrms continuous, ANSI/IEEE C37.90.1 transient protection
Open Input Response: Downscale (<5s, flag set)
Power Supply Current: 30mA (from system bus)
Dimensions: 114.6mm (H) × 15.3mm (W) × 82.8mm (D)
Weight: Approx. 100g (typical)
Environmental:
- Operating Temperature: -40°C to +85°C
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 0–95%, non-condensing
Compliance: CE, EN61000-6-2 (Immunity), EN61000-6-4 (Emissions), ATEX pending, UL/CUL Class I, Div 2 pending

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### 4. Functionality

The MAQ20-KTC module measures temperature from Type K thermocouples and converts the analog signals into digital data accessible via the MAQ20 system bus. Each channel is independently configurable for input range, alarm thresholds, and averaging.

Operation:
- The module connects to the MAQ20 backbone, which distributes power and communication signals.
- Upon insertion, the module automatically registers with the system and begins data acquisition.
- Data is stored locally and made available through the Modbus-compatible address map.
- Cold junction compensation is performed internally using four precision sensors for high accuracy.
- Hardware filtering rejects 50/60Hz interference, ensuring stable readings in noisy environments.

Applications:
- Industrial process monitoring and control
- Temperature profiling in manufacturing
- Environmental and materials testing
- Energy management systems
- Laboratory and research instrumentation

Compatibility:
- Works with MAQ20-COMx communication modules (Ethernet, USB, RS-232/RS-485)
- Integrates with MAQ20-BKPLx backbones and MAQ20-PWR3 power modules
- Supported by Dataforth’s ReDAQ Shape and Configuration Software Tool

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### 5. Components & Accessories

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

Optional Accessories:
- MAQ20-BKPLx system backbones (various channel capacities)
- MAQ20-COMx communication modules
- MAQ20-PWR3 power supply module for extended systems
- ReDAQ Shape software (MAQ20-940 Developer / MAQ20-941 User versions)
- MAQ20-945 Configuration Software Tool
- MAQ20-951 IPEmotion software interface

Connectors:
- 20-position terminal block (spring cage type)
- Shield terminals provided for each channel pair (CH0–CH7)
- Shield terminals connected to field-side common, isolated from bus

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### 6. Installation & Setup

Mounting:
- DIN-rail mountable (standard 35mm rail)
- Can be installed on continuous flat panels or plates
- Modules snap into place using integrated clip

Installation Steps:
1. Mount the MAQ20-BKPLx backbone on the DIN rail.
2. Insert the MAQ20-COMx communication module in the leftmost position and apply power.
3. Insert the MAQ20-KTC module into any vacant backbone slot.
4. Observe Power (blue) and Communication (yellow TX/RX) LEDs for proper operation.
5. Connect thermocouple leads to the terminal block according to the channel mapping.

Channel Connections:
- CH0–CH7: Differential inputs (+IN, -IN)
- Shield terminals provided for each channel pair

Configuration:
- Automatic module registration assigns a unique registration number.
- Channels can be enabled/disabled and configured for range, alarms, and averaging via Modbus registers or Dataforth software.
- Settings can be stored in EEPROM for retention after power cycles.

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### 7. Performance & Capabilities

Measurement Performance:
- High accuracy and stability across full industrial temperature range.
- Independent channel configuration ensures flexibility for mixed-range measurements.
- Over-range and under-range measurement up to ±2% beyond standard input values.

Alarm System:
- Four alarm types per channel: High, High-High, Low, Low-Low.
- Configurable as tracking or latching alarms.
- Adjustable deadbands to prevent false triggering.
- Alarm status indicated by red LED and accessible via Modbus registers.

Signal Averaging:
- Per-channel averaging with programmable weighting (2⁰–2¹⁵).
- Reduces noise and stabilizes readings in fluctuating environments.

Data Handling:
- Each module supports 8 channels of real-time data, min/max/average values, and last 8 readings per channel.
- Data stored in 16-bit registers accessible via Modbus.
- Address offset determined by module registration number (2000 × R).

Limitations:
- Designed for Type K thermocouples only (other thermocouple types require corresponding MAQ20-xTC models).
- Maximum continuous input voltage limited to 150Vrms.

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### 8. Standards & Compliance

Quality Management: ISO9001:2008 Registered QMS
Electrical Safety: ANSI/IEEE C37.90.1 transient protection
EMC Compliance:
- EN61000-6-4 (Emissions, ISM Group 1, Class A)
- EN61000-6-2 (Immunity, ISM Group 1, Performance A ±0.5% span error)
Environmental: Heavy Industrial CE compliance
Hazardous Location: UL/CUL Class I, Division 2, Groups A, B, C, D (pending)
ATEX Certification: Pending approval for explosive atmospheres
RoHS Compliance: Meets EU environmental directives

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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
- Warranty covers defects in materials and workmanship under normal use
- Excludes damage from misuse, overvoltage, or improper handling

Repair & Returns:
- Return Material Authorization (RMA) required for all returns
- Ship prepaid to Dataforth Corporation, Tucson, AZ
- Repair warranty: 90 days from receipt or remainder of original warranty

Support & Maintenance:
- Technical support via email (techinfo@dataforth.com) or phone (800-444-7644)
- Application engineers available for configuration and troubleshooting assistance
- Software updates and errata available at [www.dataforth.com](http://www.dataforth.com)

Maintenance Procedures:
- Modules are hot-swappable; replacement does not require system shutdown
- Automatic re-registration upon insertion
- LED indicators assist in diagnostics (PWR, STAT, TX, RX, ALM)

LED Indicators Summary:
- PWR (Blue): Power status
- STAT (Green): Module status (1Hz blink normal, 5Hz blink for identification)
- TX/RX (Yellow): Communication activity
- ALM (Red): Alarm condition

Software Tools:
- ReDAQ Shape (MAQ20-940/941): Graphical HMI design and runtime environment
- Configuration Software Tool (MAQ20-945): Module setup and system mapping
- IPEmotion (MAQ20-951): Multi-vendor, multi-language data acquisition platform

Manufacturer Contact:
Dataforth Corporation
3331 E. Hemisphere Loop
Tucson, AZ 85706 USA
Phone: +1-520-741-1404 | Toll-Free: 800-444-7644
Fax: +1-520-741-0762
Email: techinfo@dataforth.com
Website: [www.dataforth.com](http://www.dataforth.com)

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### Summary

The Dataforth MAQ20-KTC is a precision, eight-channel Type K thermocouple input module engineered for industrial-grade data acquisition and control. It combines high accuracy, robust isolation, and flexible configuration in a compact DIN-rail form factor. Designed for seamless integration into the MAQ20 modular system, it supports advanced alarm management, per-channel averaging, and Modbus-compatible communication. With its rugged design, wide operating temperature range, and compliance with international standards, the MAQ20-KTC is ideal for demanding industrial, laboratory, and process automation environments requiring reliable temperature measurement and control.