Multi-Zone Gas Monitor

Industry Leading Precision Monitoring for Low-level Gas Leak Detection

Bacharach’s Multi-Zone Gas Monitor provides precise measurements enabling early leak detection for compliance with refrigeration safety codes (ASHRAE 15EN 378CSA-B52) and emissions reduction standards (F-GasCARB).

  • Proprietary infrared (NDIR) sensor accurately detects the presence of a target gas down to an industry-leading 1 ppm Minimum Detection Level (MDL)
  • Sensor is not prone to false alarms caused by cross-interference from other gases or sudden changes in temperature or humidity
  • Gas library contains 60+ refrigerants, including CFCs, HFCs, HCFCs, HFOs and natural refrigerants (R-744, R-717)
  • Backlit display shows real-time concentration readings and makes configuration and self-diagnostics intuitive
  • Capable of monitoring up-to 16 zones (expandable up to 48 sample points) and detecting multiple gases with a single monitor
  • Two optional analog outputs (4-20mA) and Modbus communications (slave) for integration with third-party BMS / BAS control systems
  • Three user-configurable relays (leak, spill and evacuate) may be used to activate external beacons / sounders, ventilation or other countermeasures

Product Information

Bacharach’s Multi-Zone Gas Monitor delivers the best refrigerant leak detection available, with industry-leading MDL of 1ppm for halogenated gases, the fastest sampling frequency and the widest range of refrigerants accurately detected. The large graphic LCD display and LED status indicators provide a system-wide overview at a glance.

The Multi-Zone enhances effective refrigerant management and ensures compliance with refrigeration safety standards (ASHRAE 15, EN 378, CSA-B52) and emissions regulations (F-Gas, CARB RMP). It detects leaks early to enable cost savings by reducing refrigerant recharge, enhancing energy efficiency and reducing risk of refrigeration failure and produce loss. A variety of communication interfaces are available including Modbus, BACnet and LonWorks, allowing easy integration into BMS / BAS systems and remote monitoring solutions.

Product Specifications
Sensor Channels:4 to 16
Sample Points:48
Measuring Range:Refrigerants: 0 to 10,000 ppm, Ammonia: 25 to 10,000 ppm Carbon Dioxide: 300 to 8,000 ppm
Sensitivity / Minimum Detection Limit:Refrigerants: 1 ppm, Ammonia: 10 ppm, Carbon Dioxide: 10 ppm
Accuracy:±1 ppm ±10% from 0-1000 ppm (refrigerants); ±10 ppm ±10% from 0-10,000 ppm (Ammonia); ±5 PPM ±5% from 300-1000 ppm (CO2)
Resolution:1 ppm
Enclosure Rating:General Purpose
Sampling Distance:0 to 1,200′ (0 to 365 m)
User Interface:Backlit, graphic LCD 160 x 128 pixel; three status LEDs
Power:100 to 240 VAC, 50/60 Hz, 20W
Analog Communications:4 to 20 mA (optional)
Digital Communications:Modbus RTU via RS 485
Operating Voltage:100 to 240 VAC, 50 / 60 Hz
Relay Rating:3 alarm relays, 1 fault relay, SPDT
Wiring:5 A @ 250 VAC, resistive load
Alarm:Integrated Audible / Visual Alarm
Ambient Temperature:32 to 122°F (0 to 50°C)
Humidity:5 to 90 %RH, non condensing
Altitude:0 to 6,560 ft (2,000 m)
Status Indicator:LCD, LEDs
Buzzer Volume:80 dB @ 10 cm
Product Dimensions (L×W×H):13.7” × 12.3” × 5” (350 × 315 × 130 mm)
Product Weight:15 lbs. (6.8 kg)
Sensor Type:NDIR
Expected Sensor Service Life:10 Years
Approvals:CE, UL, CSA, EN 61010-1, EN 61326, EN 14624
Warranty:2 Years
Country of Origin:United States
Accessories and Parts
HGM-RD, Remote Display Module (See Technical Library for Instruction Manual)
Audible / Visual Alarm, 110 VAC, Blue Strobe
Audible / Visual Alarm, 120 VAC, Red Strobe
Horn + Strobe 24 V DC – Blue Lens
Strobe – Blue Lens – MP120K 120 V AC Adapter
Horn + Strobe 24 V DC – Red Lens
Strobe – Red Lens – MP120K 120 V AC Adapter
Horn + Strobe 24 V DC – Amber Lens
Strobe – Amber Lens – MP120K 120 V AC Adapter
Air Sample Tubing (250 ft. / 76 m roll)
Air Sample Tubing – AMMONIA ONLY (500 ft. / 152 m roll)
Air Sample Tubing Coupling, Quick Disconnect
Splitter Kit, 2-way, includes line end filters and brackets (Not for use w/NH3)
Splitter Kit, 3-way, includes line end filters and brackets(Not for use w/NH3)
R-22 Gas Verification Kit
R-134a Gas Verification Kit
R-123 Gas Verification Kit
Variable Flow Regulator
1031 Cylinder, 100 ppm R-22
1031 Cylinder, 100 ppm R-134a
1031 Cylinder, 100 ppm R-123
120 VAC Surge Protector
4-20 mA DC Surge Protector
Wall-Mount Uninterruptable Power Supply (UPS) Backup
BacNet Communications Module Package
N2 (JCI Metasys) Communications Package
Lon Works Communications Package
4 Zone Expansion Kit (max of 3 per MZ) Note: Must also order 3015-3411
Dual 4-20 mA DC output PC board
Line End Filter Only
Line End Filter Assembly
Charcoal Filter Assembly with Fittings
Charcoal Filter Mounting Bracket
Splash/Spray-Resistant End of Line Filter Assembly
Hydrophobic Filter (Internal Water Stop)
Inline Water Trap
Inline Water Trap, Replacement Filter Element
Line End Water Stop
Sample Pump


Contact Us

To speak to a member of our friendly customer service team about any of our products or services, please do not hesitate to contact us on the details below:

Telephone: (+44) 1527 522 299