Comprehensive Product Summary – Dataforth MAQ20‑RTD41

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### 1. Product Overview

Product Name: MAQ20‑RTD41
Article Number: MAQ20‑RTD41
Series: MAQ20 Industrial Data Acquisition and Control System
Manufacturer: Dataforth Corporation
Mounting Type: DIN‑rail mount to MAQ20 backbone
Form Factor: Modular, hot‑swappable I/O module
Product Description:
The MAQ20‑RTD41 is a high‑performance, 5‑channel, 4‑wire resistance input module designed for precision measurement of RTDs, potentiometers, and resistive sensors such as Pt100 and Ni120. It is part of Dataforth’s MAQ20 modular data acquisition and control platform, engineered for industrial environments requiring high accuracy, robust isolation, and flexible configuration. The module provides direct connection to 4‑wire sensors, ensuring minimal lead‑wire error and superior measurement stability.

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### 2. Key Features

- Multi‑Sensor Compatibility: Supports 4‑wire RTDs (Platinum Pt100, Nickel Ni120) and potentiometers up to 5 kΩ.
- High Accuracy: ±0.06 % of span typical accuracy; ±0.035 % conformity; ±0.3 °C cold‑junction compensation accuracy.
- Channel Isolation: 1500 Vrms channel‑to‑bus isolation; ±3 V channel‑to‑channel isolation.
- Input Protection: 240 Vrms continuous field I/O protection; ANSI/IEEE C37.90.1 transient protection.
- Industrial Ruggedness: Operates from −40 °C to +85 °C; 0–95 % RH non‑condensing.
- High Density: Five fully configurable input channels in a compact 15.3 mm‑wide DIN‑rail module.
- Per‑Channel Configuration: Each channel independently selectable for sensor type, range, alarms, and averaging.
- Advanced Alarms: Four programmable alarm levels (High, High‑High, Low, Low‑Low) with tracking or latching behavior and deadband control.
- Signal Averaging: Configurable exponential averaging (weight = 2⁰–2¹⁵) for noise reduction.
- Hot‑Swappable: Modules can be inserted or removed under power without system interruption.
- Automatic Registration: System auto‑detects module insertion/removal and assigns registration numbers.
- Software Integration: Compatible with ReDAQ Shape™, MAQ20 Configuration Tool, and IPEmotion software; Modbus‑compliant memory map.
- Compliance: CE‑marked, designed for UL Class I Div 2 and ATEX hazardous locations (pending).

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Model | MAQ20‑RTD41 |
| Input Channels | 5 channels, 4‑wire RTD/potentiometer |
| Supported Sensors | Pt100 (α = 0.00385), Ni120 (α = 0.00672), potentiometer 0–5 kΩ |
| Input Ranges | −200 °C to +850 °C (default); −200 °C to +200 °C; −100 °C to +100 °C; −80 °C to +300 °C; 0–5000 Ω |
| 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 | 1500 Vrms channel‑to‑bus; ±3 V channel‑to‑channel |
| CMR | 100 dB @ 50/60 Hz |
| NMR | 20 dB @ 50/60 Hz |
| Input Protection | 240 Vrms continuous; ANSI/IEEE C37.90.1 transient |
| Power Supply | 7–34 V DC via MAQ20 backbone |
| Current Consumption | 35 mA typical |
| Dimensions (H × W × D) | 114.6 × 15.3 × 82.8 mm (4.51 × 0.60 × 3.26 in) |
| Weight | Approx. 120 g (typical) |
| Operating Temperature | −40 °C to +85 °C |
| Storage Temperature | −40 °C to +85 °C |
| Humidity | 0–95 % RH non‑condensing |
| Isolation | 1500 Vrms channel‑to‑bus, 1 min |
| Compliance | CE (EN61000‑6‑2/‑6‑4), UL/CUL pending, ATEX pending |
| Enclosure | Industrial polycarbonate housing, ventilated |
| Mounting | DIN rail (35 mm) to MAQ20 backbone |

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### 4. Functionality

The MAQ20‑RTD41 measures resistance or temperature from RTDs and potentiometers using precision, low‑magnitude excitation currents to minimize self‑heating. Each channel performs linearization internally, converting raw resistance to temperature or engineering units.

Operation Principle:
- Excitation current is applied through the 4‑wire connection, eliminating lead‑wire resistance errors.
- The module digitizes each channel independently and transmits data via the MAQ20 backbone to the communications module.
- Data is accessible through Modbus registers, allowing integration with SCADA, PLC, or PC‑based systems.

Use Cases:
- Industrial process temperature monitoring
- Laboratory and test‑bench data acquisition
- Equipment condition monitoring
- Environmental and HVAC control systems
- Remote sensing in hazardous or high‑noise environments

Compatibility:
- Works with MAQ20‑COMx communication modules (Ethernet, USB, RS‑232/485).
- Integrates with MAQ20‑BKPLx backbones and MAQ20‑PWR3 power modules.
- Software support via ReDAQ Shape HMI, MAQ20 Configuration Tool, IPEmotion, and LabVIEW VIs.

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### 5. Components & Accessories

Included:
- MAQ20‑RTD41 module
- Pluggable field‑side terminal block (20‑position)
- ESD‑safe packaging and documentation

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)

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

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### 6. Installation & Setup

Mounting:
- Snap‑fit onto standard 35 mm DIN rail.
- Align the rear hook with the rail, slide downward, and rotate until it clicks.
- Removal via bottom clip or flat‑blade screwdriver.

System Integration:
1. Install MAQ20‑BKPLx backbone and MAQ20‑COMx module.
2. Apply 7–34 V DC power to the COMx module.
3. Insert the MAQ20‑RTD41 into any backbone slot; registration occurs automatically.
4. Connect field wiring to the pluggable terminal block.
5. Configure channels using MAQ20 Configuration Tool or Modbus commands.

Wiring:
- Use 4‑wire RTD connections for highest accuracy.
- For 2‑wire sensors, jumper +EXC and +IN terminals.
- Shield terminals connect to field‑side common (isolated from bus).

Configuration:
- Channel enable/disable via Modbus register 140.
- Range selection via register 100.
- Averaging weight via register 120.
- Alarm setup via registers 700–999.

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### 7. Performance & Capabilities

- Sampling Rate: 200 channels/s aggregate.
- Bandwidth: 3 Hz per channel.
- Resolution: 0.012 % of span.
- Accuracy: ±0.06 % of span (typical).
- Open‑Input Response: Upscale or downscale within < 5 s with flag set.
- Alarm Processing: High, High‑High, Low, Low‑Low with tracking or latching modes.
- Signal Averaging: Exponential filter (2⁰–2¹⁵ weight).
- Isolation Integrity: 1500 Vrms channel‑to‑bus for 1 minute.
- Noise Rejection: 100 dB CMR and 20 dB NMR at 50/60 Hz.
- Environmental Robustness: Full operation −40 °C to +85 °C; 95 % RH non‑condensing.
- System Scalability: Up to 24 I/O modules (384 channels) per 19‑inch rack.

Limitations:
- Designed for resistive sensors only; not suitable for thermocouples or voltage/current inputs.
- Requires MAQ20 backbone and COMx module for operation.

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### 8. Standards & Compliance

- Quality System: ISO 9001:2008 registered QMS.
- Electrical Safety: UL/CUL Class I Division 2 Groups A–D (pending).
- EMC Emissions: EN 61000‑6‑4 (ISM Group 1, Class A).
- EMC Immunity: EN 61000‑6‑2 (ISM Group 1, Performance A/B).
- Transient Protection: ANSI/IEEE C37.90.1.
- CE Marking: Heavy Industrial CE compliant.
- ATEX Compliance: Pending certification for hazardous locations.
- Environmental: RoHS compliant materials; ventilated housing for thermal management.

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### 9. Additional Information

Warranty:
- Hardware: 1 year from date of delivery.
- Software: 30 days from delivery.
- Special Products: 60 days.
- Coverage includes repair, replacement, or refund at Dataforth’s discretion for defects in materials or workmanship.
- Excludes damage from misuse, static discharge, or operation beyond specified limits.

Repair & Returns:
- Obtain RMA number from Dataforth Customer Service before return.
- Ship prepaid to:
Dataforth Corporation
3331 E. Hemisphere Loop, Tucson, AZ 85706 USA
Phone: +1 520‑741‑1404 / 800‑444‑7644
Email: techinfo@dataforth.com

Support & Maintenance:
- Technical support available via phone or email.
- Firmware updates and errata posted at [www.dataforth.com](https://www.dataforth.com).
- Modules are hot‑swappable and auto‑registered for easy maintenance.
- Diagnostic registers (1900–1910) report watchdog, brownout, and communication errors.

LED Indicators:
- PWR (Blue): Power OK.
- STAT (Green): Normal 1 Hz blink; 5 Hz blink on Module Detect.
- TX/RX (Yellow): Communication activity.
- ALM (Red): Alarm condition active.

Safety Notes:
- Use ESD precautions during handling.
- Not intended for life‑support or critical applications where failure may cause injury or death.

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### Summary

The Dataforth MAQ20‑RTD41 is a precision, industrial‑grade, 5‑channel 4‑wire RTD/potentiometer input module engineered for the MAQ20 modular data acquisition system. It delivers laboratory‑class accuracy, robust isolation, and configurable functionality in a compact DIN‑rail form factor. Each channel is independently programmable for sensor type, range, averaging, and alarms, making it ideal for complex temperature and resistance measurement applications in industrial automation, process control, and test environments.

With its 1500 Vrms isolation, 240 Vrms input protection, and −40 °C to +85 °C operating range, the MAQ20‑RTD41 ensures reliable performance in harsh conditions. Integration with Dataforth’s ReDAQ Shape and Configuration Tool software provides intuitive setup and real‑time data visualization. Backed by Dataforth’s ISO‑certified manufacturing and comprehensive support, the MAQ20‑RTD41 is a robust solution for high‑accuracy temperature and resistance data acquisition within distributed industrial systems.