Merlin GM151

SKU: GM151 Category:
  • Dual channel operation.
  • 100~240VAC & 24V AC/DC power supply input.
  • Optional Particulate Matter PM sensor
  • Factory calibrated field replaceable sensor modules.
  • Two analog output signals in the range of voltage or current loop principle.
  • One relay signal (1A)
  • 2*Latching Relays (RYL 1 & RYL2) / 8A @ 230V.
  • Digital RS485 communication – Modbus RTU or BACnet MS/TP – field selectable.
  • Strong anti-interference circuit boards and RoHS compliant.
  • Standard corrosion resistant enclosure

Description

The Merlin GM151 is a multi-sensor air quality monitor capable of detecting up to two gases alongside particulate matter (PM), providing real-time environmental monitoring from a single device. Designed for standalone operation or seamless integration with Building Management Systems (BMS), it features BACnet MS/TP, Modbus RTU, configurable outputs, replaceable smart sensor modules and a clear LCD display. By combining gas and particulate monitoring, the GM151 helps optimise ventilation and improve indoor air quality.

TECHNICAL SPECIFICATIONS
MECHANICAL ELECTRICAL
Material ABS Flame Retardant UL94 V0 Voltage 100–240VAC & 24V AC/DC
Height 8.2” (210mm) Power 20W Max (Full Load)
Width 5.6” (142mm) Wiring (RS485) 127 Units
Depth 2” (53mm)    
Weight 350g / 12.5 oz    
I/O ENVIRONMENTAL
Digital Output x1 Modbus RTU or BACnet MS/TP (field selectable) Operating Temperature -4° to 122°F (-20° to 50°C)
Signal Relay Output x1 1A, 60VDC Humidity 15–90% RH (continuous), 0–99% RH (intermittent), non-condensing
Analog Outputs x2 0/4–20mA or 0/2–10V (field selectable) Atmospheric Pressure 6561ft (2000m)
Relay 1 & 2 Latching Relays (RYL1 & RYL2), 8A @ 230V Installation Category II
    Pollution Degree 3
USER INTERFACE CERTIFICATION / CONFORMANCE
LED Indications x2 Power, Alarm Low, Alarm High, Fault, Calibration Safety UL / CSA / IEC / EN / BS 61010-1
Audible Alarm x1 >85dB Electromagnetic Compatibility Directive 2014/30/EU / Regulation 2016 / EN 50270
Button(s) x3 Silence Alarm / Reset Unit / Manual Override Gas Performance UL 2075 (CO and NO)
Language English    
FCC
Compliance Statement This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation.

Merlin GM151 User Manual

Merlin GM151 Installation Guide