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The Multi-Zone Gas Leak Monitor

HGMMZ - Refrigerant gas multi-zone monitor with remote display

The Multi-Zone Gas Leak Monitor provides monitoring for low-level conditions of CFC, HCFC, HFC and Ammonia refrigerant gases used in most commercial refrigerant systems. This state-of-the-art product leads the industry in performance, cost of ownership, integration capabilities and cost.

Features & Benefits

  • Proprietary infrared sensing technology virtually eliminates false alarms and extends sensor life
  • No calibration required
  • Low detection limits enable leaks to be found early, reducing energy and refrigerant consumption
  • Fastest sampling rate with the longest sampling distance in the industry at 1,200 feet
  • Large Graphic LCD for easy set-up and real-time monitoring

Multi-Zone Specifications

Product Type The Multi-Zone Gas Leak Monitor is a multiple area monitoring system for low level continuous monitoring of refrigerant gases used in most commercial systems including; CFC, HCFC, HFC and Ammonia. System design supports compliance to gas monitoring requirements of ANSI/BSR ASHRAE 15-1994.
Gas Library HGM-MZ: CFC: R11, R12, R113, R114, R502, HFP
HFC: R404A (HP62), R407A, R407C (AC9000), R134A, R410A (AZ20),
HFC: R507 (AZ50)
HCFC: R21, R22, R23, R123, R124, R227, R500, R503, R401A (MP39), R402A (HP80), R402 (HP81), R408A, R409A, R508B (SUVA95),
R236FA, R125, R245FA, R422A, R422D, R427A
Halon: H1301, H2402, H1211
Other: FA188, FC72, N1230, HFO1234YF, R424A, R426A, R427A, R438A
AGM-MZ: Ammonia (NH3), R717
CO2-MZ: Carbon Dioxide (CO2), R744
Sensitivity All gases 1 ppm (R11 ± 10 ppm ± 15% of reading 0-1000 ppm)
Measuring Range HGM-MZ: All gases 0 to 10,000 ppm
AGM-MZ: Ammonia 25 to 10,000 ppm
CO2-MZ: Carbon Dioxide 0 to 8,000 ppm
Accuracy HGM-MZ: ±1 ppm ±10% of reading from 0-1,000 ppm (R11, R22, R13: ±10 ppm
±15% of reading 0-1,000 ppm)
AGM-MZ: ±10 ppm ±10% of reading from 0-1,000 ppm
CO2-MZ: ±5 ppm ±5% of reading from 0-1,000 ppm, ±10% of reading from 1,000
to 4,000 ppm, ±15% of reading 4,000 to 8,000 ppm
Front Panel

3 indicator lights

  • Green = Monitor is powered on. LED glows during normal operation; flashes when unit is in warm-up mode
  • Red = Alarm. LED flashes when any point has exceeded the alarm setting
  • Yellow = Fault. LED flashes when there is a system fault


Size & Weight 12.23" H x 13.7" W x 4.96" D / 15lbs.
Temperature Drift HGM-MZ: ±0.8% (R134A) of reading per Degrees C between purge cycles
AGM-MZ: 1.5 ppm per Degrees C between purge cycles
CO2-MZ: Less than 1 ppm per Degrees C between purge cycles
Coverage 4 point standard, expandable to 16 points in 4 point increments
Detector Type Infrared Non-Dispersive
Sampling Mode Automatic or Manual (hold)
Re-Zero Auto or on Zone Change
Response Time 5 to 120 seconds — depending on air line length and number of zones
System Noise Less than 40dB(A) @ 10 feet (3m)
Monitoring Distance 1,200 ft. maximum for combined length of sample + exhaust tubing (each zone)
Conditional System Dual optional 4-20mAdc isolated outputs. Channel 1 = zone area, Channel 2 = PPM
Alarms Four SPDT alarm contacts are provided (rated 5 Amps at 250 volts). Three assigned to PPM level alarms, one assigned to system faults
Communications Full two-way communications with proper remote display module or building management system via RS485 MODBUS-RTU serial interface. RS-232C communications port standard
Power Safety Mode Fully automatic system reset. All programmed parameters retained
Operating Temp. 32 to 122 °F (0 to 50 °C)
Ambient Humidity 5% to 90% RH (non-condensing)
AC Power 100 to 240 VAC, 50/60 Hz, 20 W
Certification UL 61010-1, Can/CSA 22.2 No. 61010-1 & CE Mark
Warranty 2 years from date of shipment
Altitude Limit 6,562 ft (2,00 m)

Multi-Zone Remote Display

    The MZ-RD Remote Display is a Multi-Zone accessory that is placed in an alternate location for the Multi-Zone with access to the diagnostics, communications and control of the unit. The MZ-RD can connect up to four Multi-Zone monitors, expanding zone coverage to 64 separate test zones.

Ordering Information

Part Number Multi-Zones
3015-5043 Halogen gas monitor 4 zone
3015-5044 Halogen gas monitor 8 zone
3015-5045 Halogen gas monitor 12 zone
3015-5046 Halogen gas monitor 16 zone
3015-5047 Ammonia gas monitor 4 zone
3015-5048 Ammonia gas monitor 8 zone
3015-5049 Ammonia gas monitor 12 zone
3015-5050 Ammonia gas monitor 16 zone
3015-5356 CO2-MZ Carbon Dioxide Gas Monitor - 4 Zone
3015-5357 CO2-MZ Carbon Dioxide Gas Monitor - 8 Zone
3015-5358 CO2-MZ Carbon Dioxide Gas Monitor - 12 Zone
3015-5359 CO2-MZ Carbon Dioxide Gas Monitor - 16 Zone
Part Number Multi-Zone Remote Displays
3015-5138Remote Display Module
Part Number Multi-Zone Kits
3015-5330HGM-MZ (4) zone with RD
3015-5331 HGM-MZ (8) zone with RD
3015-5332 HGM-MZ (12) zone with RD
3015-5333 HGM-MZ (16) zone with RD
3015-5334 AGM-MZ (4) zone with RD
3015-5335 AGM-MZ (8) zone with RD
3015-5336 AGM-MZ (12) zone with RD
3015-5337 AGM-MZ (16) zone with RD
3015-5531 CO2-MZ 4 Zone Monitor with Remote Display
3015-5532 CO2-MZ 8 Zone Monitor with Remote Display
3015-5533 CO2-MZ 12 Zone Monitor with Remote Display
3015-5534 CO2-MZ 16 Zone Monitor with Remote Display