Description
The Honeywell Analytics MIDAS-T-004 is a single-zone ammonia gas monitor designed for continuous detection of NH₃ concentrations from 9 to 100 ppm. Operating on 24 VDC, it uses single-pass infrared non-dispersive sensing technology to provide accurate measurement and stable performance. The MIDAS-T-004 supports remote sampling up to 100 ft and integrates with control systems via relay outputs, 4–20 mA signal, and Modbus/TCP communication.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Honeywell Analytics |
| Category |
Gas Detection |
| Part Number |
MIDAS-T-004 |
| Subcategory |
Fixed Gas Monitor |
| Supply Voltage |
24 VDC (-15% to +10%) @ 208 mA |
| Gas Detected |
Ammonia (NH₃) |
| Measurement Range |
9–100 ppm |
| Sensing Technology |
Single-pass Infrared Non-Dispersive (NDIR) |
| Repeatability |
±5% of measured value |
| Linearity |
±2% of measured value |
| Response Time |
2–30 seconds (tube length dependent) |
| Warm-Up Time |
<10 minutes |
| Signal Outputs |
3 alarm relays; 4–20 mA @ 250 Ω |
| Communication Protocol |
Modbus/TCP |
| Operating Temperature |
32° to 104°F (0° to 40°C) |
| Operating Humidity |
15% to 90% RH non-condensing |
| Enclosure Rating |
NEMA 1 |
| Dimensions |
5.9 in H x 12.6 in W x 6 in D |
| Weight |
1.8 lb (0.8 kg) |
Information About MIDAS-T-004
The MIDAS-T-004 is a fixed gas detection module engineered for monitoring ammonia in industrial and commercial environments. It features a single-pass NDIR sensor for selective gas detection with ±2% linearity and ±5% repeatability across its measurement range. The unit includes three configurable alarm relays, a system fault relay, and a 4–20 mA analog output for integration with building management or safety systems. Designed for single-point monitoring, it includes a 10 ft sampling and exhaust tube and supports extended sampling distances up to 100 ft.
Key Features:
- Ammonia Detection (NH₃): Monitors concentrations from 9–100 ppm using NDIR technology.
- Single-Pass Infrared Sensor: Provides stable and selective gas measurement.
- Multiple Alarm Outputs: Three alarm relays (1A @ 30 VDC / 0.5A @ 125 VAC) plus fault relay.
- 4–20 mA Output: Enables integration with PLCs and building management systems.
- Modbus/TCP Communication: Supports network-based monitoring and diagnostics.
- Digital Display: 4-digit screen for real-time and peak gas level indication.
- Remote Sampling Capability: 10 ft tube included; supports up to 100 ft sampling distance.
- Visual Alarm Indication: Provides local visual notification of alarm conditions.
The MIDAS-T-004 delivers the reliability and precision required for fixed ammonia gas detection and safety monitoring systems.
