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Merlin
GM100
CO/NO2 Gas Detector
Monitor: Carbon Monoxide / Nitrogen dioxide
INSTALLATION & OPERATION
Please read these instructions carefully before use and retain for future reference.
These instructions can also be downloaded in electronic form on the product website.
snsnorthern.com
info
snsnorthern.com
S&S NORTHERN LTD – PR7 7JN, UK Tel: +44 (0) 1257 470983 -
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Summary of Contents for S&S Northern Merlin GM100
- Page 1 Merlin GM100 CO/NO2 Gas Detector Monitor: Carbon Monoxide / Nitrogen dioxide INSTALLATION & OPERATION Please read these instructions carefully before use and retain for future reference. These instructions can also be downloaded in electronic form on the product website. snsnorthern.com info snsnorthern.com S&S NORTHERN LTD –...
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Page 2: Table Of Contents
GM100 Installation & Operation Manual CONTENTS IMPORTANT INFORMATION ....................3 Manufacturer’s Warranty ....................3 INSTALLATION ......................4 General Information: ............................. 4 Key Features ..............................4 User Interface ..............................4 Applications ..............................4 Appearance ..............................5 Positioning ..............................5 Mounting Instructions ............................ 6 PCB Overview .............................. -
Page 3: Important Information
GM100 Installation & Operation Manual IMPORTANT INFORMATION Take extra care where this symbol is used to understand the nature of any potential hazards and how to avoid them. Before any installation, use or maintenance, read this manual carefully. This product is for Dry Environment Use only. Avoid prolonged use in dusty environments. -
Page 4: Installation
GM100 Installation & Operation Manual INSTALLATION General Information: The GM100 has been designed for being directly connected to a BMS/BAS system. The equipment is to be installed in non-classified, non-hazardous, permanent locations and is intended to continuously monitor the ambient air for dangerous gas concentrations. The monitor features two configurable alarm levels, audible alarm and current and voltage outputs with LCD &... -
Page 5: Appearance
GM100 Installation & Operation Manual Appearance M4x15mm bolts Secures front fascia decal. LCD Display Gas Type / Concentration / Unit / ID User Buttons Silence audible buzzer / Acknowledge alarm / Fan On / Navigate menu LED Status Indication Power-OK / Fault-Warning / Alarm / Calibration Gas Sensor Opening Allows diffusion monitoring of air and gas Positioning... -
Page 6: Mounting Instructions
GM100 Installation & Operation Manual Mounting Instructions Carefully remove the front cover from the unit by using an M3 hex key. Using the rear base - mark mounting holes to the wall or align with a vertical 2-gang/pattress box. Fixing straight to wall – drill 0.2” (5mm) hole, insert plugs and use the four screws (No.4 Pozi) provided. There are 2* knockouts for cable entry on the rear of the base For 12”... -
Page 7: Pcb Overview
GM100 Installation & Operation Manual PCB Overview Rev 01 Page 7 of 24... -
Page 8: Rs-485 Wiring
GM100 Installation & Operation Manual RS-485 Wiring NOTE: WARRANTY MAY BE VOID IF DAMAGE OCCURS TO CIRCUIT BOARD COMPONENTS FROM THE USE OF SOLID CORE WIRE ATTACHED DIRECTLY TO WIRING TERMINALS. All wiring should be run within properly grounded (earth or safety) conduit. The cable shield should be connected to earth ground at the controller/power supply that is providing power to the equipment. -
Page 9: Analog Output Wiring
GM100 Installation & Operation Manual Default Communication Setting Baud Rate 9600 Parity None Data Bits Stop Bits Adjustable RS-485 settings Slave ID 1 - 127 Baud Rate 9600 / 19200 / 38400 / 57600 - Modbus or 76800 - BACnet Parity None / Even / Odd Max Info Frames (BACnet) -
Page 10: Operation
GM100 Installation & Operation Manual OPERATION Start Up: During initial powering, the instrument will go through a 60 sec start-up count-down sequence. Once initialized the normal mode will be displayed as follows: Button function in normal operation: Button Description Press for 5 sec to activate manual fan override, use the < > buttons to select the manual override time in min, this will output 10V on analog outputs AN1 and AN2 for the selected time and display a flashing M as shown. -
Page 11: Led Status Indication S1 & S2
GM100 Installation & Operation Manual Low Alarm: In low alarm the red LED will blink High Alarm: In High alarm the red LED will be solid on and the display screen will turn Red. LED Status Indication S1 & S2 Visual indication of the gas detector status is provided by a single RGB colour LED. -
Page 12: Settings Menu
GM100 Installation & Operation Manual Settings Menu To enter the settings menu hold the <SILENCE & RESET> buttons for 5 sec. Now Use <SILENCE OK RESET> buttons to scroll through the numbers and ENTER CODE 753. Hold the OK button for 3 sec to accept the code and enter the menu mode. Press OK again to enter the MENU. -
Page 13: Calibration & Maintenance
GM100 Installation & Operation Manual Menu Display Message Parameter Default Description S1: CO ALARM L 25 PPM S1: CO low alarm setpoint Measuring range 10-High alarm PPM S1: CO ALARM H 100 PPM S1: CO high alarm setpoint Measuring range low alarm ~ 250 PPM S2: NO2 ALARM L 0.5 PPM S2: NO2 low alarm setpoint... -
Page 14: Bump Test Procedure
GM100 Installation & Operation Manual Why is it important? A detector may visually appear in good working order, but its sensitivity and accuracy can be inhibited by external factors. Dust, humidity, temperature fluctuations, cleaning products, contaminants, exposure to its target gas or sensor drift (ageing) can cause a decline in sensitivity, accuracy, and eventual failure. How often? Regular bump tests are important to make sure the detector can detect a release of gas as early as possible and usually takes seconds (gas type dependant i.e., CO sensors will take over a minute) and is often... -
Page 15: Additional Information: Sensor Principle - Electrochemical
GM100 Installation & Operation Manual Additional Information: Sensor Principle - Electrochemical Electrochemical sensors measure the partial pressure of gases under atmospheric conditions. The monitored ambient air diffuses through a membrane into the liquid electrolyte in the sensor. The electrolyte contains a measuring electrode, a counter-electrode, and a reference electrode. - Page 16 GM100 Installation & Operation Manual Press OK to confirm the gas type. Press Ok to start the calibration. When the calibration has started the screen will change to blue. Important: Do not apply gas during the CO ZERO, wait until a beep is heard. When instructed apply an appropriate test gas within the range specified in the table at the start of the calibration procedure, applying the gas to inlet as detailed below.
- Page 17 GM100 Installation & Operation Manual After approximately 120 sec check the gas value is stable and no longer rising, now use the ↑↓ to adjust the value to exactly match the test gas bottle value, the example below is a reading using a 120ppm calibration gas.
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Page 18: Replace / Disable S1 Or S2
GM100 Installation & Operation Manual As a final calibration check a bump test must be carried out as detailed in the bump test section. REPLACE / DISABLE S1 or S2 If only a single gas type is required S1 or S2 can be disabled. Follow the procedure in the Setting Menu section to enter the code 753. -
Page 19: Commissioning & Maintenance
GM100 Installation & Operation Manual Select the detected gas type CO or NO2, press OK to confirm. Now press Ok and then < press OK to select BACK and wait 10 sec for timeout or press Ok to return to normal operation. -
Page 20: Sensor Replacement
GM100 Installation & Operation Manual Interval Description Check installation, orientation, mounting, cable entry & wiring. Check/perform calibration. During commissioning Check indications for proper operation. Check buzzer and relay operation. Check signal transmission to the BMS/central controller, where appropriate. Inspection by trained service personnel. **Every 6-18 months Calibrate, bump, or change the sensor with a factory calibrated one. -
Page 21: Splash Guard Installation
GM100 Installation & Operation Manual Splash Guard Installation For any application requiring protection from water, a splash guard accessory pack can be ordered including 2* splash guard covers and a rear sealing gasket. Splash guard kit: part number MG-SPL Clip the 2 * splash guards over the gas vents. Rev 01 Page 21 of 24... - Page 22 GM100 Installation & Operation Manual It is recommended to carry out regular maintenance, the side gas vent holes should be brush-cleaned to avoid them being clogged, the frequency will depend on the environmental conditions. To avoid water entering the rear of the monitor the sealing gasket should be adhered to the rear of the monitor using the self-adhesive tape, positioning squarely to the rear of the enclosure and firmly press into position.
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Page 23: Technical Specification
GM100 Installation & Operation Manual TECHNICAL SPECIFICATION Mounting Wall mounted fixings Entry 2 * knockouts 22.5mm Size (W x H x D) 4.37” (111.2mm)* 5.95” (151.2mm) * 1.97” (50mm) Mechanical Weight (Max) 350g / 12.5 oz Enclosure ABS Flame Retardant UL94 V0 24V AC/DC Nominal 24V AC/DC (12-32V) Electrical... - Page 24 GM100 Installation & Operation Manual We recommend all S&S equipment be commissioned by competent/trained engineers to ensure correct installation and operation. We strongly recommend the response and alarm signals are tested and validated once installed. This will ensure the equipment performs as intended and is free from any unforeseen damage caused by transit/installation.
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