Danfoss GD Gas Detection Units
GD gas detection units monitor and warn of hazardous gas concentrations in industrial refrigeration plants, detecting commonly used refrigerants. These next-generation digital gas detectors connect to a central system — a gas detection controller or PLC — via analog signal or RS485 open Modbus communication, which converts the alarm signal into activation of alarm devices.
Wenzhou Phonetoo Electromechanical Co., Ltd. is an authorized Danfoss distributor in China. Contact us for availability, pricing and delivery time.
Key features
- Digital, factory-configured and pre-calibrated — plug-and-play installation, no adjustment required
- Factory default 2-step alarm setup ready for use; two individually configurable alarm ranges, password protected
- Flexible connection: analog or RS485 open Modbus
- Fieldbus wiring — connect and power up to 96 sensors, max. 900 m wire length per segment; expansion modules permit additional segments
- Automatic self-diagnostics ensure correct communication and operation
- Temperature-compensated sensors for higher accuracy and reduced risk of false alarms
- Sensor seal cap prevents premature exposure during installation
- LED status signals; Basic+ adds local buzzer & light for audio-visual alarms
- On-board acknowledge button to reset alarms and verify no gas leaks are present
Series overview
| Series | Description |
|---|---|
| GD Basic / Basic+ | Gas detection units for connection to a central system (gas detection controller or PLC) |
| GD Premium series | GD, GD+, Duplex, Remote, Flex and Uptime variants — for standalone use or centralized monitoring, with on-board relays to activate alarm devices directly |
The Premium series datasheet is currently available in Chinese — contact us and we will confirm the exact sensor type and alarm thresholds for your refrigerant.
Code numbers
Ordering codes for Danfoss GD gas detection units (Basic / Basic+ and Heavy Duty series). Confirm the exact type and code number in your RFQ and we will quote it.
| Series | Model | Refrigerant | Sensor | Measuring range | Code no. |
|---|---|---|---|---|---|
| GD Basic | Basic | Ammonia | Electrochemical | 0–100 ppm | 148H6000 |
| GD Basic | Basic+ | Ammonia | Electrochemical | 0–100 ppm | 148H6001 |
| GD Basic | Basic | Ammonia | Electrochemical | 0–300 ppm | 148H6008 |
| GD Basic | Basic+ | Ammonia | Electrochemical | 0–300 ppm | 148H6009 |
| GD Basic | Basic | Ammonia | Electrochemical | 0–1000 ppm | 148H6014 |
| GD Basic | Basic+ | Ammonia | Electrochemical | 0–1000 ppm | 148H6015 |
| GD Basic | Basic | Ammonia | Semiconductor | 0–1000 ppm | 148H6023 |
| GD Basic | Basic+ | Ammonia | Semiconductor | 0–1000 ppm | 148H6024 |
| GD Basic | Basic | Ammonia | Semiconductor | 0–10000 ppm | 148H6071 |
| GD Basic | Basic Remote | Ammonia | Semiconductor | 0–10000 ppm | 148H6073 |
| GD Basic | Basic | Ammonia | Pellistor | 0–140000 ppm | 148H6070 |
| GD Basic | Basic | Ammonia | Pellistor | 0–28000 ppm | 148H6080 |
| GD Basic | Basic Remote | Ammonia | Pellistor | 0–28000 ppm | 148H6081 |
| GD Basic | Basic | HFC (R32, R125, R143A, R404A, R407C, R410A, R434A, R448A, R452B, R507A) | Semiconductor | 0–2000 ppm | 148H6045 |
| GD Basic | Basic+ | HFC (R32, R125, R143A, R404A, R407C, R410A, R434A, R448A, R452B, R507A) | Semiconductor | 0–2000 ppm | 148H6046 |
| GD Basic | Basic | CO2 | Infrared | 0–20000 ppm | 148H6072 |
| GD Heavy Duty | Heavy Duty (display) | Ammonia | Electrochemical | 0–100 ppm | 148H6059 |
| GD Heavy Duty | Heavy Duty (display) | Ammonia | Electrochemical | 0–300 ppm | 148H6060 |
| GD Heavy Duty | Heavy Duty (display) | Ammonia | Electrochemical | 0–1000 ppm | 148H6022 |
| GD Heavy Duty | Heavy Duty (display) | Ammonia | Electrochemical | 0–5000 ppm | 148H6031 |
| GD Heavy Duty | Heavy Duty (display) | Ammonia | Semiconductor | 0–10000 ppm | 148H6035 |
| GD Heavy Duty | Heavy Duty (display) | Ammonia | Pellistor | 0–140000 ppm (0–100% LEL) | 148H6039 |
| GD Heavy Duty | Heavy Duty (no display) | Ammonia | Electrochemical | 0–100 ppm | 148H6064 |
| GD Heavy Duty | Heavy Duty (no display) | Ammonia | Electrochemical | 0–300 ppm | 148H6065 |
| GD Heavy Duty | Heavy Duty (no display) | Ammonia | Electrochemical | 0–1000 ppm | 148H6066 |
| GD Heavy Duty | Heavy Duty (no display) | Ammonia | Electrochemical | 0–5000 ppm | 148H6067 |
| GD Heavy Duty | Heavy Duty (no display) | Ammonia | Semiconductor | 0–10000 ppm | 148H6068 |
| GD Heavy Duty | Heavy Duty (no display) | Ammonia | Pellistor | 0–140000 ppm (0–100% LEL) | 148H6069 |
| GD Heavy Duty | Heavy Duty (display) | R290 / R1270 / R600A | Pellistor | 0–5000 ppm | 148H6061 |
| GD Heavy Duty | Heavy Duty (display) | R744 (CO2) | Infrared | 0–50000 ppm (0–5% Vol) | 148H6075 |
Basic+ models include buzzer and light.
Spare parts and accessories
| Description | Code no. |
|---|---|
| Replacement sensor – Ammonia EC 100 | 148H6200 |
| Replacement sensor – Ammonia EC 300 | 148H6201 |
| Replacement sensor – Ammonia EC 1000 | 148H6202 |
| Replacement sensor – Ammonia SC 1000 | 148H6203 |
| Replacement sensor – HFC R404A, R507 SC 2000 | 148H6210 |
| Replacement sensor – HFC R1234yf SC 2000 | 148H6239 |
| Replacement sensor – HFC R134a SC 2000 | 148H6211 |
| Replacement sensor – CO2 IR 20000 | 148H6207 |
| Replacement remote sensor – Ammonia P 28000 | 148H6257 |
| Replacement sensor – Ammonia P 28000 | 148H6258 |
| Replacement sensor – Heavy Duty Ammonia EC 100 | 148H6240 |
| Replacement sensor – Heavy Duty Ammonia EC 300 | 148H6241 |
| Replacement sensor – Heavy Duty Ammonia EC 1000 | 148H6217 |
| Replacement sensor – Heavy Duty Ammonia EC 5000 | 148H6218 |
| Replacement sensor – Heavy Duty Ammonia SC 10000 | 148H6219 |
| Replacement sensor – Heavy Duty Ammonia P LEL | 148H6220 |
| Replacement sensor – Heavy Duty R290 / Propane P 5000 | 148H6242 |
| Replacement sensor – Heavy Duty CO2 IR 50000 | 148H6255 |
| Controller unit | 148H6231 |
| Controller solution (controller + enclosure) | 148H6221 |
| Controller solution uptime (UPS for controller) | 148H6237 |
| Controller expansion module | 148H6222 |
| Service tool | 148H6224 |
| PC tool | 148H6235 |
| Calibration adapter, Heavy Duty | 148H6233 |
Datasheet downloads
Frequently asked questions
What is the Danfoss GD gas detection unit used for?
The GD is a gas detection unit for industrial refrigeration safety. It continuously monitors the air for refrigerant leaks and raises alarms before gas concentrations become hazardous.
Which gases can the GD detect?
It detects commonly used refrigerants, including ammonia (electrochemical sensor) — tell us which refrigerant you need to monitor and we will select the right sensor version. It can also detect Freon and carbon dioxide.
What is the difference between GD Basic and Basic+?
Both monitor and warn of hazardous gas concentrations; they differ in sensor and function options. Tell us the gas type and the area to be monitored and we will propose the correct version. The main difference between the two is that the Basic+ has a display while the GD Basic does not.
How do the alarms work?
The units come with a factory-default 2-step alarm setup: Alarm 1 is a pre-alarm when the gas level passes the first threshold, and Alarm 2 is the main alarm at the second threshold. Both thresholds are configurable via the integrated software.
How is the GD connected to the plant control system?
Each unit connects to a central Gas Detection Controller or a PLC by analog signal or RS485 open Modbus communication; the central system converts the alarm signal into activation of alarm devices such as sirens, beacons or ventilation.
Where should gas detectors be installed?
In machinery rooms, above or around potential leak points (valve stations, flanges, compressors), and in occupied cold storage areas — following local safety regulations for the refrigerant in use.
Does the sensor compensate for temperature changes?
Yes — the digital user interface with temperature compensation gives higher sensor accuracy and reduces false alarms from temperature swings in the plant room.
Is this a genuine Danfoss product? How long is delivery?
Yes. We are an authorized Danfoss industrial refrigeration distributor in China, listed in Danfoss China’s official authorized dealer directory. All units are brand-new, genuine stock with valid warranty. We ship from China; express delivery takes about 1–2 weeks to most destinations worldwide.