Comprehensive Product Summary – Dataforth MAQ20‑RTD31

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### 1. Product Overview

Product Name: MAQ20‑RTD31
Model Number: MAQ20‑RTD31
Series: MAQ20 Industrial Data Acquisition and Control System
Article Number: MAQ20‑RTD31
Manufacturer: Dataforth Corporation, Tucson, Arizona, USA
Product Type: DIN‑rail mounted, 6‑channel, 3‑wire RTD/Ni/Potentiometer input module

The MAQ20‑RTD31 is a precision resistance input module designed for use within Dataforth’s MAQ20 modular data acquisition and control platform. It provides six isolated input channels for 3‑wire RTD sensors, nickel RTDs, and potentiometers, offering high accuracy, robust isolation, and industrial‑grade reliability. The module mounts directly to the MAQ20 backbone and communicates through the system’s Modbus‑compatible architecture.

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### 2. Key Features

- Multi‑Sensor Compatibility: Supports 100 Ω platinum RTDs (α = 0.00385), 120 Ω nickel RTDs (α = 0.00672), and potentiometers up to 5 kΩ.
- Six Independent Channels: Each channel is individually configurable for sensor type, range, alarms, and averaging.
- High Accuracy: ±0.06 % of span typical accuracy; ±0.035 % conformity; ±0.3 °C cold‑junction compensation accuracy.
- Robust Isolation: 1500 Vrms channel‑to‑bus isolation; ±3 V channel‑to‑channel isolation.
- Input Protection: 240 Vrms continuous overload protection; ANSI/IEEE C37.90.1 transient protection.
- Industrial Ruggedness: Operates from –40 °C to +85 °C; 0–95 % RH non‑condensing.
- High‑Density DIN‑Rail Mounting: Compact 15.3 mm width allows up to 24 modules (384 channels) per 19‑inch rack.
- Hot‑Swappable: Modules can be inserted or removed without powering down the system.
- Advanced Alarms: Four programmable alarm levels per channel (High, High‑High, Low, Low‑Low) with tracking or latching modes.
- Signal Averaging: Configurable exponential averaging with selectable weighting (2⁰–2¹⁵).
- Automatic Module Registration: The system auto‑detects and assigns registration numbers to modules.
- Software Integration: Fully supported by Dataforth’s ReDAQ Shape HMI software, MAQ20 Configuration Tool, and IPEmotion.
- Compliance: CE compliant; UL/CUL and ATEX certifications pending; ISO 9001:2008‑registered manufacturing.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Input Channels | 6, individually configurable |
| Sensor Types | Pt100 (α = 0.00385), Ni120 (α = 0.00672), Potentiometer 0–5 kΩ |
| Input Ranges | Pt100 –200 °C to +850 °C (default); Pt100 –200 °C to +200 °C; Pt100 –100 °C to +100 °C; Ni120 –80 °C to +300 °C; Pot 0–5 kΩ |
| Resolution | 0.012 % of span |
| Accuracy | ±0.06 % of span (includes conformity, hysteresis, repeatability) |
| Conformity | ±0.035 % of span |
| Zero Tempco | ±50 ppm/°C |
| Span Tempco | ±35 ppm/°C |
| Bandwidth | 3 Hz |
| Scan Rate | 200 channels/s |
| Common‑Mode Voltage (CMV) | 1500 Vrms channel‑to‑bus (1 min); ±3 V channel‑to‑channel |
| Common‑Mode Rejection (CMR) | 100 dB @ 50/60 Hz |
| Normal‑Mode Rejection (NMR) | 20 dB @ 50/60 Hz |
| Input Protection | 240 Vrms continuous; ANSI/IEEE C37.90.1 transient |
| Open Input Response | Upscale or downscale selectable; < 5 s response |
| Power Supply Current | 35 mA typical |
| Dimensions (H × W × D) | 114.6 mm × 15.3 mm × 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 | EN 61000‑6‑4 (ISM Group 1, Class A) |
| EMC Immunity | EN 61000‑6‑2 (ISM Group 1, Performance A/B) |
| Certifications | CE; UL Class I Div 2 Groups A–D pending; ATEX pending |

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### 4. Functionality

The MAQ20‑RTD31 measures resistance‑based sensors using precision matched current sources to minimize self‑heating and cancel lead‑wire resistance in 3‑wire configurations. Each channel performs linearization internally, converting raw resistance to temperature or position values. Hardware low‑pass filters reject 50/60 Hz interference.

Use Cases and Applications:
- Industrial process temperature monitoring using Pt100 or Ni120 RTDs.
- Position or displacement measurement via potentiometers or slide‑wires.
- Laboratory and test‑stand data acquisition.
- Environmental and HVAC control systems.
- Integration into distributed control systems (DCS) and SCADA platforms.

Compatibility:
Operates within the MAQ20 system alongside MAQ20‑COMx communication modules (Ethernet, USB, RS‑232/485) and MAQ20‑BKPLx backbones. Data is accessible via Modbus memory map, allowing integration with third‑party software and PLCs.

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### 5. Components & Accessories

Included:
- MAQ20‑RTD31 module
- Pluggable 20‑position terminal block for field wiring
- ESD‑protective packaging
- Documentation and quick‑start guide (digital)

Optional Accessories:
- MAQ20‑BKPLx backbones (various slot counts)
- MAQ20‑COMx communication modules
- MAQ20‑PWR3 auxiliary power supply module
- ReDAQ Shape software (MAQ20‑940/941)
- MAQ20‑945 Configuration Tool
- IPEmotion software (MAQ20‑952)

Terminal Block Pinout (Top → Bottom):
1–3 CH0 (+EXC/SHIELD, +IN, –IN)
4–6 CH1 (+EXC/SHIELD, +IN, –IN)
7–9 CH2 (+EXC/SHIELD, +IN, –IN)
12–14 CH3 (+EXC/SHIELD, +IN, –IN)
15–17 CH4 (+EXC/SHIELD, +IN, –IN)
18–20 CH5 (+EXC/SHIELD, +IN, –IN)
(Positions 10–11 not connected)

Shield terminals tie to field‑side common and are isolated from the system bus.

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### 6. Installation & Setup

Mounting:
DIN‑rail clip design enables quick insertion and removal. Modules can be mounted on continuous panels or plates with 3U vertical spacing.

Installation Steps:
1. Align module with DIN rail and slide downward to engage the hook.
2. Rotate until it snaps into place.
3. Connect field wiring to the pluggable terminal block.
4. Insert into any available backbone slot.

Removal:
Depress the bottom clip by hand or gently pry with a flat screwdriver to release.

System Setup:
1. Install MAQ20‑BKPLx backbone and MAQ20‑COMx communication module.
2. Apply 7–34 V DC power.
3. Insert MAQ20‑RTD31 modules; automatic registration assigns sequential numbers.
4. Configure channels via ReDAQ Shape or Configuration Tool.

Modules can be hot‑swapped; the system automatically detects additions or removals.

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### 7. Performance & Capabilities

- Sampling Rate: Up to 200 channels per second across all active channels.
- Signal Conditioning: Hardware low‑pass filtering for 50/60 Hz noise rejection.
- Averaging: Exponential moving average with selectable weight (2⁰–2¹⁵).
- Alarm System:
- Four thresholds per channel (High, High‑High, Low, Low‑Low).
- Tracking or latching modes.
- Configurable deadbands to prevent chatter.
- Alarm status reflected in registers and red ALM LED.
- Reset Functions:
- *Standard Reset* restores last saved EEPROM settings.
- *Reset‑to‑Default* returns to factory configuration.
- LED Indicators:
- PWR (Blue): Power status.
- STAT (Green): Operational heartbeat (1 Hz blink).
- TX/RX (Yellow): Communication activity.
- ALM (Red): Alarm condition.
- Reliability: Brown‑out detection and watchdog timer ensure predictable recovery.
- Data Integrity: Over‑range on one channel does not affect others; 1500 Vrms isolation prevents cross‑talk.

Limitations:
- Designed for 3‑wire sensors; 2‑wire operation requires terminal jumpers.
- Maximum potentiometer resistance 5 kΩ.
- Not intended for life‑support or critical safety systems.

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### 8. Standards & Compliance

- Quality System: ISO 9001:2008‑registered manufacturing.
- Electrical Safety: 1500 Vrms isolation; 240 Vrms continuous field I/O protection.
- EMC Compliance:
- EN 61000‑6‑4 (Emission, ISM Group 1 Class A)
- EN 61000‑6‑2 (Immunity, ISM Group 1 Performance A/B)
- Transient Protection: ANSI/IEEE C37.90.1.
- Environmental: Designed for Class I Division 2 hazardous locations.
- Pending Certifications: UL/CUL Listing, ATEX approval for hazardous areas.
- CE Marking: Fully compliant for heavy industrial environments.

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### 9. Additional Information

Warranty:
- Hardware: 1 year from date of delivery.
- Software: 30 days.
- Special products: 60 days.
Dataforth will repair, replace, or refund defective units returned within the warranty period. Warranty excludes damage from misuse, static discharge, or operation beyond specified limits.

Repair & Returns:
- Obtain a Return Material Authorization (RMA) before shipping.
- Ship prepaid to:
Dataforth Corporation
3331 E. Hemisphere Loop, Tucson, AZ 85706 USA
- Include model number, serial number, contact information, and repair instructions.

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

Maintenance:
Modules are hot‑swappable; replacement with identical models retains registration numbers. Periodic visual inspection and verification of communication LEDs are recommended.

Software Updates:
Firmware and configuration utilities are available at [www.dataforth.com/maq20_download.aspx](https://www.dataforth.com/maq20_download.aspx).

Safety Notice:
Not authorized for life‑support, nuclear, or other critical applications where failure could cause injury or severe damage.

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### Summary

The Dataforth MAQ20‑RTD31 is a high‑precision, six‑channel resistance input module engineered for demanding industrial data acquisition and control environments. It combines exceptional accuracy, robust electrical isolation, and flexible configuration within a compact DIN‑rail form factor. Each channel supports platinum and nickel RTDs or potentiometers, with per‑channel range selection, alarm management, and averaging. Integrated protection against transients and overloads ensures long‑term reliability in harsh conditions.

When integrated into the MAQ20 system, the RTD31 provides seamless Modbus‑based communication, automatic registration, and compatibility with Dataforth’s ReDAQ Shape and Configuration software. Its rugged design, wide operating temperature range, and compliance with industrial EMC and safety standards make it an ideal choice for process monitoring, test automation, and distributed control applications requiring precise temperature or resistance measurement.