MLD Refrigerants

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Manufacturer: GVZ Components

Gas Leakage detector for A1, A2L, A3


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R-290 application

Molecular Leakage Detector for A1, A2L, A3 refrigerant gas based on ultimate MPS technology. Hydrogen Detection READY.

This refrigerant gas detector is a unique solution using the latest MPS (Molecular Property Spectrometry) technology to indicate the presence of low GWP A1, A2L and A3 refrigerant gas providing both a continous signal proportional to the gas concentration and the activation via relay for alarming once a prefixed (and settable) level is reached.
It combines all the advantages of MPS technology as in terms of long lifetime, no field calibration, built-in envirnomental compensation, no poisoning, wide temperature operating range and durability with a dedicated electronic board for easy interfacing the common control units thanks to the multiple outputs: Modbus, Relays and 4-20mA.

mld application
  • No field calibration
  • No cross sensitivity
  • Long lifetime 15+ years
  • Fail safe (built-in diagnostic)
  • A1 gas concentration 400-2500ppm
  • A2L, A3 gas concentration 5-100% LEL
  • Built-in T and Rh compensation
  • Immune to poisoning
  • Operating range -40° to 75° C, 0-100% Rh
  • Modbus, Relays and 4-20mA Output (ALL IN ONE)
Technology Molecular Property Spectrometry by NevadaNano
Gas detected A1
R404A, R407C
R32, R454B, R454C
R290, R170, R600, R600a
Response Time (T90) <20 sec. <15 sec. <20 sec.
Resolution 1ppm 0,1% LEL 0,1% LEL
Lifetime 15+ years

MLD Gas PN Gas Type Measuring Range Accuracy (0-50 %LEL)
guaranteed across full environmental range
(ISO 10156)
Accuracy @25%LEL
guaranteed across full environmental range
(ISO817/ASHRAE 34)
Accuracy ≤25 %LEL
@ 20 °C - 50 %RH
(UL 60335-2-40)
1 --        
2 R290 0-100% LEL ± 6% LEL    
3 R32 0-100% LEL   ± 3% LEL ± 2.5% LEL
4 R454B 0-100% LEL   ± 5% LEL ± 2.5% LEL
5 R454C 0-100% LEL   ± 5% LEL ± 2.5% LEL
6 R600
0-100% LEL ± 5% LEL    
7 H2 0-100% LEL ± 5% LEL    
8 --        


Signals Output

Gas concentration, Temperature, Humidity, Pressure, Status, Prealarm, Alarm, Fault, Lifetime

Measurament Output

Modbus, 4-20mA, Relays, 0,4-2V

Visual Information

3 x LED (Status, Prealarm, Alarm/Fault)

Supply Voltage


Power Consumption

35mA average - 50mA peak

Operating Temperature

-40° to +75°C

Operating Humidity

0 - 100% RH

Operating Pressure

80 to 120 kPa

Protection grade


Dimensions MLD-S4

13 x 8 x 4,0 cm

Dimensions MLD-MN

13 x 8 x 2,5 cm

Certifications & Approvals

CE, EMC 61326-1:2013, Rohs, IEC60079-29-1, IEC60335-2-40,
EN50271, ATEX(opt)


Via Magenta, 77/16A
20017 Rho (MI) - Italy
Phone +39 02 3340 0846
VAT: IT04126380155

Via Magenta, 77/16A
Rho 20017, Italy

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+39 02 3340 0846

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