ENMET GSM-60 User manual

ENMET
680 Fairfield Court
Ann Arbor, MI 48108
734.761.1270 Fax [phone]
www.enmet.com
GSM-60
Operation Manual

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 1
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
Table of Contents
1.0 INTRODUCTION....................................................................................................................................................................................3
1.1 Unpack.............................................................................................................................................................................................3
1.2 Check Order.....................................................................................................................................................................................3
1.3 Serial Numbers.................................................................................................................................................................................3
2.0 INSTRUMENT FEATURES .....................................................................................................................................................................4
2.1 Exterior Features..............................................................................................................................................................................4
2.2 Display Panel Features.....................................................................................................................................................................4
2.3 Circuit Board Features.....................................................................................................................................................................6
3.0 INSTALLATION.....................................................................................................................................................................................7
3.1 Mounting of Instrument...................................................................................................................................................................7
3.2 Power Supply...................................................................................................................................................................................8
3.3 Inputs / Outputs................................................................................................................................................................................8
3.3.1 Sensor/Transmitter Connection ......................................................................................................................................................................9
3.3.2 Relay Contacts................................................................................................................................................................................................9
3.3.3 Optional 4-20mA Outputs............................................................................................................................................................................. 10
3.4 Installation Verification .................................................................................................................................................................10
4.0 OPERATION........................................................................................................................................................................................11
4.1 Normal Operation Condition .........................................................................................................................................................11
4.2 Alarm Set Points ............................................................................................................................................................................11
4.3 Alarm Latching or Differential Settings ........................................................................................................................................12
4.4 Audio Defeat..................................................................................................................................................................................12
4.5 Display...........................................................................................................................................................................................12
4.6 Operational Menu ..........................................................................................................................................................................13
4.7 Fault Indications.............................................................................................................................................................................14
4.7.1 Low Flow Indication.....................................................................................................................................................................................14
4.7.2 Other Fault Indications.................................................................................................................................................................................14
4.8 Hydrocarbon Sensor Response ......................................................................................................................................................14
5.0 MAINTENANCE ..................................................................................................................................................................................15
5.1 Cleaning Instructions .....................................................................................................................................................................15
5.2 Maintenance Menu.........................................................................................................................................................................15
5.2.1 Accessing Maintenance Menu....................................................................................................................................................................... 15
5.2.2 Maintenance Menu Flow Chart.................................................................................................................................................................... 16
5.3 Calibration for CO, O2, HC and CO2 (Gas Channels).....................................................................................................................17
5.3.1A Low Cal/Zero Cal Adjust............................................................................................................................................................................18
5.3.1B High Cal/Span Gas Adjust..........................................................................................................................................................................19
5.3.2 Set 4 –20mA Transmitter Scale..................................................................................................................................................................... 19
5.3.3 Set Alarm Points...........................................................................................................................................................................................20
5.3.4 Set Alarm Delay............................................................................................................................................................................................ 22
5.3.5 Relay Configuration...................................................................................................................................................................................... 23
5.3.6 Failsafe Configuration.................................................................................................................................................................................. 24
5.3.7 Set Output Span Range .................................................................................................................................................................................24
5.3.8 Set New Password......................................................................................................................................................................................... 25
5.3.9 Exit Maintenance Menu................................................................................................................................................................................ 25
5.4 Sensor Replacement.......................................................................................................................................................................26
5.4.1 Gas/Oxygen Sensor....................................................................................................................................................................................... 26
5.4.2 Calibration/Sensor Replacement ..................................................................................................................................................................26
5.4.3A Low Cal/Zero Cal Adjust............................................................................................................................................................................28
5.4.3B High Cal/Span Gas Adjust..........................................................................................................................................................................29
5.5 Flow Control Orifice......................................................................................................................................................................29
6.0 TECHNICAL DATA AND SPECIFICATIONS .........................................................................................................................................29
7.0 REPLACEMENT PART NUMBERS.......................................................................................................................................................30
7.1 ENMET part numbers for sensors and replacement parts:.............................................................................................................30
7.2 ENMET part numbers for Calibration equipment:.........................................................................................................................30
APPENDIX A: CO CHARACTERISTICS ....................................................................................................................................................31
APPENDIX B: GAS IONIZATION POTENTIALS.........................................................................................................................................32

GSM-60
ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
List of Figures
Figure 1: External Features of the GSM-60.......................................................................................................................5
Figure 2: GSM-60 Interior Features...................................................................................................................................6
Figure 3: GSM-60 Mounting Dimensions .........................................................................................................................7
Figure 2A: Relay, Input and Output Terminals..................................................................................................................8
Figure 4: GSM-60 Operational Display...........................................................................................................................11
Figure 5: GSM-60 Operation Menu Flow Chart..............................................................................................................13
Figure 6: GSM-60 Maintenance Menu Flow Chart. ........................................................................................................16
Figure 7: GSM-60 Calibration Connections ....................................................................................................................18
Figure 9: Location of Gas Sensor and PiD(HC) Manifolds .............................................................................................26
Figure 7: GSM-60 Calibration Connections ....................................................................................................................28
Figure 10: Carbon Monoxide Concentration....................................................................................................................31
List of Tables
Table 1 : Relay Failsafe Settings......................................................................................................................................10
Table 2: Sensor Output ....................................................................................................................................................10
Table 3: Typical Factory Alarm Set Points......................................................................................................................11
Table 4: Factory Set Gas alarms Delay............................................................................................................................22
Reference Information:
NOTE: [important information about use of instrument]
CAUTION:[affects equipment – if not followed may cause damage to instrument, sensor etc.…]
WARNING:[affects personnel safety – if not followed may cause bodily injury or death.]
Attention / Warning
Earth Ground
!

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 3
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
1.0 Introduction
The GSM-60 is a sample draw monitoring instrument that measures and detects certain toxic hazards gases. The GSM-60 was designed primarily
for monitoring one area with a single sampling hose, either for an individual gas or multiple gases. The instrument has one sampling pump and one
flow sensor. The instrument is available with up to 4 internal sensors. Available sensors include, but are not, limited to carbon monoxide (CO),
carbon dioxide (CO2), Hydrocarbons (HC) and variations in the oxygen (O2) content. The sensors can be used alone or up to four sensors can be
used together. Some applications require monitoring of more than one area. If two sampling hoses are connected to one GSM-60 the flow sensor
can only detect a total flow fault condition. For example, a pump failure or both sampling hoses being blocked. The system cannot detect a flow
fault if only one of the two sampling hoses is blocked.
Flowmeters should be installed in both sampling lines to provide a visual indication of proper flow. In the instrument, a 24 VDC sampling pump pass
air over each sensor and the resulting electrical outputs are used to evaluate the air for the target gases.
The GSM-60 is a highly adaptable instrument. Some adaptations require an addendum be added to the manual to facilitate use of the instruments
with these adaptations. If addendum is needed, see page(s) between sections replacement part numbers and warranty.
Some features of the instruments are as follows:
continuous monitoring of the sample air
alarm relay contacts available on terminals
continuous LCD display of gas and vapor concentrations
a fault relay and visual fault alarm
menu driven operational and maintenance controls
low air flow fault indication and display
menu driven calibration procedure
alarm acknowledgement capability including audio defeat
audio and visual alarms indicate unsafe conditions
mA outputs for each target gas
Hydrocarbons (HC) are limited to gases with an ionization potential of 10.6 eV or less. See Appendix B for a list of gases and IPs.
NOTE:All specifications stated in this manual may change without notice.
1.1 Unpack
Unpack the GSM-60 and examine it for shipping damage. If such damage is observed, notify both ENMET customer service personnel and the
commercial carrier involved immediately.
Regarding Damaged Shipments
NOTE: It is your responsibility to follow these instructions. If they are not followed, the carrier will not honor any claims for damage.
•This shipment was carefully inspected, verified and properly packaged at ENMET and delivered to the carrier in good condition.
•When it was picked up by the carrier at ENMET, it legally became your company’s property.
•If your shipment arrives damaged:
oKeep the items, packing material, and carton “As Is.” Within 5 days of receipt, notify the carrier’s local office and request immediate
inspection of the carton and the contents.
oAfter the inspection and after you have received written acknowledgment of the damage from the carrier, contact ENMET Customer
Service for return authorization and further instructions. Please have your Purchase Order and Sales Order numbers available.
•ENMET either repairs or replaces damaged equipment and invoices the carrier to the extent of the liability coverage, usually $100.00.
Repair or replacement charges above that value are your company’s responsibility.
•The shipping company may offer optional insurance coverage. ENMET only insures shipments with the shipping company when asked to do
so in writing by our customer. If you need your shipments insured, please forward a written request to ENMET Customer Service.
Regarding Shortages
If there are any shortages or questions regarding this shipment, please notify ENMET Customer Service within 5 days of receipt at the following
address: ENMET
680 Fairfield Court
Ann Arbor, MI 48108
734-761-1270 Fax [phone]
Toll Free: 800-521-2978
1.2 Check Order
Check, the contents of the shipment against the purchase order. Verify that the GSM-60 is received as ordered. If there are accessories on the
order, ascertain that they are present. Check the contents of calibration kits. Notify ENMET customer service personnel of any discrepancy
immediately.
1.3 Serial Numbers
Each GSM-60 is serialized. These numbers are on tags on the equipment and are on record in an ENMET database.

GSM-60
ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
2.0 Instrument Features
2.1 Exterior Features
The exterior of the instrument is shown in Figure 1. The exterior features are as follows:
Feature
Description
Enclosure
An engineered thermoplastic box, approximately 10x8x6, with a clear hinged front cover.
Input Port
The entrance for the air sample and calibration gas. The quick release fitting mates with
one on the calibration adapter.
Front Cover Latch
A quick-release latch that holds the clear front cover in place, and is capable of being
padlocked if desired.
Audio Alarm
A loud horn activated by certain alarm conditions.
Mounting Flanges
Flanges with holes for mounting the enclosure to a vertical surface.
Output Port
The exit to exhaust the air sample and calibration gas. Luer fitting.
2.2 Display Panel Features
The display panel, shown in Figure 1, is viewed through the clear front cover of the enclosure, and is accessed by opening the
cover. Features are as follows:
Feature
Description
Display
A 2 line, 16 character per line, LCD with backlight.
The numerical values of gas concentrations, and other information are displayed.
Visual
Alarms & Indicators
On either side of the display:
A red alarm LED for each sensor installed in the instrument, Low level alarm.
The top center of the panel:
A red alarm LED for all sensors installed in the instrument, High level alarm.
Near the center of the panel:
A green power indicator LED
A red fault alarm indicator LED
Pushbutton Switches
There are three of these, located near the center of the panel; they are yellow
rectangular membrane switches. They are:
•O
PTION
Switch
The top left switch.
•S
ELECT
Switch
Directly to the right of the
OPTION
switch.
•Audio Defeat / Alarm
Acknowledge
Switch
Directly below the
OPTION
switch.

GSM-60
ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
Figure 1: External Features of the GSM-60
* NOTE: Typical gas reading & alarm locations, depending on instrument configuration, alarms & readings may be in alternate
locations
O
2
%
CO
ppm
Front Cover Latch
Quick Release Fitting
Input Port
Sample/Calibration
Audio Alarm
Fault LED
SELECT
Switch
Power LED
OPTION
Switch
A
LARM
ACKNOWLEDGE/
ALARM DEFEAT
Switch
*Visual Alarm O2
(If Oxygen option is installed)
See *note below
*Visual Alarm CO
(See *note below)
Mounting Flanges
2 places
H2S
*Visual Alarm
Dew Point
(If Dew Point option
is installed)
See *note below
Display, see *note below
CO reading O2reading
H2S reading
Channel #1
Channel #3
Channel #4
Channel #2
Visual Alarm 2
ALARM 2
OPTION
SELECT
ALARM
ACKNOWLEDGE
POWER
FAULT
Sample Output Port

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ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
2.3 Circuit Board Features
The Display Panel is hinged on the left and is released by unscrewing the 2 screws located in the right corners. After releasing
the panel, it is swung to the left, exposing the interior of the enclosure. The Circuit Board is mounted at the back surface of the
enclosure interior. Features are shown in Figure 2.
Feature
Description
Relay Terminals
This group of terminals is located at the left side of the Circuit Board.
For the contacts for each of four alarm relays, and for the contacts of a fault relay.
Output Terminals
One 4-20mA output per active channel. 2 channels/outputs per connector.
HC Manifold
Sensor Manifold
The PiD sensor is installed into this housing.
The sample manifold, the carbon monoxide, carbon dioxide and oxygen sensors are
located under this housing.
Filter, Particulate
Removes contaminate from air sample line.
Sensor Terminals
J16, J18, J19
Sensor/Transmitter connectors 24V
DC
4-20mA Input
Figure 2: GSM-60 Interior Features

GSM-60
ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
3.0 Installation
3.1 Mounting of Instrument
The GSM-60 should be located near the air to be monitored. Sampling lines should be no more than 50 feet long. It is
recommended that Teflon® (PTFE) lined tubing be used. Quick disconnect fittings are supplied for use with 1/8” ID tubing.
Mount the instrument on an appropriate vertical surface using the mounting flanges provided. Avoid areas with excessive vibration
or temperature extremes. The holes in the flanges are 0.31 inch in diameter and form a 6 x 10.75-inch rectangle. See Figure 3.
It is recommended to use #8 drywall anchors and screws for mounting the GSM-60 to a drywall/sheetrock surface.
Dimensions are in inches. Figure 3: GSM-60 Mounting Dimensions
Mounting Holes
0.31” dia. 4 places

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Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
3.2 Power Supply
The input power can vary from 100 to 240VAC, 50/60 Hz. Mains power should be connected to the Power Input Terminal J23 and
the ground screw J21. See Figure 2 for location.
WARNING:Continuous gas detection and alarm systems (110VAC/220VAC / 24VDC/12VDC powered) become inoperative upon
loss of primary power. Contact factory for specifications and pricing of backup battery systems.
Upon supplying air and power to the instrument:
The green power on LED is lit.
The display backlight is lit, and instrument will step through a start-up sequence: unit serial number, software revision and gases
monitored may be shown on the display.
The instrument may go into alarm briefly, but the sensors stabilize quickly. If the instrument persists in alarm, acknowledge the
alarm by pressing the AUDIO DEFEAT / ALARM ACKNOWLEDGE switch. If alarm persists longer than 30 minutes, call ENMET
customer service personnel.
3.3 Inputs / Outputs
Two types of alarm outputs are available, relay contacts and 4-20mA outputs.
Figure 2A: Relay, Input and Output Terminals
Relay 1
Channel 1
Alarm 1
Relay 2
Channel 2
Alarm 1
Relay 3
Channel 3
Alarm 1
Relay 4
Channel 4
Alarm 1
Relay 5
Channel 1
-4
Alarm 2
Relay 6
Ch 1
-4 / System
Fault
Input Connector
24V
DC
GND
mA
Input Connector
24V
DC
GND
mA
Input Connector
24V
DC
GND
mA
Connector 2
Channel 3 & 4
4-20mA Output
Connector 1
Channel 1 & 2
4-20mA Output
Connector RS485
Connector RS232
Connector RS485
Ground Screw J21
Power Input
Terminal J23

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Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
3.3.1 Sensor/Transmitter Connection
Sensor/Transmitters are connected to the GSM-60 control unit with two or three-conductor wiring, use the correct oil tight
fitting. Size of wire depends on the distance between the sensor/transmitter and the control unit.
See Recommended Wire Gauge Table below.
2 Wire for Sensors/Transmitter
3 Wire for Sensors/Transmitter
Position
Function
Position
Function
1
Power +24 V
DC
1
Power +24 V
DC
2
Not Used
2
Power Ground
3
Signal/Return to Ground
3
Signal
Recommended Wire Gauge
Distance from Sensor to Control Unit
Recommended Wire Gauge
< 500 feet
16 AWG
501 – 800 feet
14 AWG
Longer Distances
Contact Factory
NOTE:Sensor Location
Gases have different densities. Some are heavier than air and concentrate at the bottom of a space. Some are lighter than air
and gather at the top. Consider the density of the gas you want the sensor to detect when you install the sensor. Some
examples are given below.
Heavier than Air Gas
Sensor Location
Bottled LP (liquefied petroleum)
Interior wall; 18-24" from floor.
•DO NOT
locate directly above or beside gas appliances (ovens,
heaters).
•Avoid locating anywhere near a vent or window or near an
outside doorway.
Propane
Butane
Gasoline
Trichloroethylene
Vaporized hydrocarbons
Hydrogen sulfide
Lighter than Air Gas
Sensor Location
Natural gas (methane)
Near ceiling.
•DO NOT locate directly above appliances where it
is subject to
direct exposure to heat or steam.
Ammonia
Hydrogen
Same Density as Air Gas
Sensor Location
Carbon Monoxide
4-6 feet above the (generally uniform) floor.
•DO NOT locate in direct air currents of windows, doors, or
vents.
If you have a question involving the location of a unit or sensor, please contact your distributor or ENMET personnel. A
technician will analyze the question and recommend a location.
3.3.2 Relay Contacts
Relay contacts are available for each alarm; these are SPDT, rated at 10Amp at 110VAC, and may be latching or non-latching as
required by the application.
They are accessed on the terminals next to each relay see Figure 2 & 2A. The contact positions are noted on the circuit board
next to each terminal.
Relays may also be configured as failsafe or non-failsafe. The default alarm relay configuration is for latching mode, and
failsafe. They may be reconfigured in the maintenance menu. See section 5.3.5 & 5.3.6
The PC Board is labeled for the relays in their un-energized state. If the relay is configured for failsafe, then this is also the alarm
condition state. Non-failsafe configured relays in the alarm state, are the reverse of the PC board labeling. Note that the
Fault(FLT) relay cannot be set to operate in a Non-Failsafe mode. Please see the Table 1 on page 10:

GSM-60
ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
Table 1 : Relay Failsafe Settings
Position
Failsafe-Alarm
Non-Failsafe-Alarm
J5 Relay 1 - NO
Normally Open
Normally Closed
J5 Relay 1 - COM
Common
Common
J5 Relay 1 - NC
Normally Closed
Normally Open
J6 Relay 2 - NO
Normally Open
Normally Closed
J6 Relay 2 - COM
Common
Common
J6 Relay 2 - NC
Normally Closed
Normally Open
J8 Relay 3 - NO
Normally Open
Normally Closed
J8 Relay 3 - COM
Common
Common
J8 Relay 3 - NC
Normally Closed
Normally Open
J10 Relay 4 - NO
Normally Open
Normally Closed
J10 Relay 4 - COM
Common
Common
J10 Relay 4 - NC
Normally Closed
Normally Open
J14 Relay 5 - NO
Normally Open
Normally Closed
J14 Relay 5 - COM
Common
Common
J14 Relay 5 - NC
Normally Closed
Normally Open
J15 Relay 6/FLT - NO
Normally Open
N/A
J15 Relay 6/FLT - COM
Common
N/A
J15 Relay 6/FLT - NC
Normally Closed
N/A
Relays can be linked to specific alarms. The table below shows the default relay links. They may be changed in the
maintenance menu if required. See Section 5.0.
Channel 1
Channel 2
Channel 3
Channel 4
Relay 1
Low Alarm
Relay 2
Low Alarm
Relay 3
Low Alarm
Relay 4
Low Alarm
Relay 5
High Alarm
High Alarm
High Alarm
High Alarm
In addition, there is a fault relay, which changes state whenever the instrument is in a fault condition. The contact positions are
noted on the circuit board next to each terminal. See Figure 2A. The coil of this relay is energized when the instrument is in
the non-fault state; the contact conditions given on the circuit board next to the terminal, are for the non-energized state, which
is identical to the fault state.
These relay contacts can be used to operate auxiliary alarms or other functions. It is recommended that power for auxiliary
equipment be supplied from an independent power source, separate from the GSM-60. Place a hole in the enclosure for a wire
exit, and use appropriate cable fittings. Be sure to note the location and depth of hardware inside the enclosure.
3.3.3 Optional 4-20mA Outputs
Isolated 4-20 mA outputs are available for data logging or other purposes. An output is supplied for each sensor supplied in an
instrument, and can be added when a sensor is added in the field. These outputs are available on the Connector 1 for channels 1
& 2 and Connector 2 for channels 3 & 4.
4mA corresponds to a sensor reading at the bottom of the instrument range and 20mA corresponds to a full-scale reading.
Standard ranges are shown in Table 2. Table 2: Sensor Output
Sensor
4mA
20mA
CO
0
50
O2
0
30
CO2
0
5000
HC
0
100
Wiring requirements are the same as for the relays.
3.4 Installation Verification
All instruments are calibrated at the factory. You may, if a calibration kit is available, calibrate the all gas channels of the
instrument 24 hours after installation to verify proper installation and instrument operation. See Section 5.0, Maintenance, for
calibration instructions. Calibration is also recommended after the first month of operation. Subsequent calibrations should be
performed every 3 months. The dew point sensor cannot be calibrated in the field.

GSM-60
ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
4.0 Operation
4.1 Normal Operation Condition
With the GSM-60 installed as described in Section 3, and in clean air, the POWER green LED is on, the display is lit and the
information on the display is as shown in Figure 4 Display, for the sensor(s) installed in the GSM-60.The red alarm and fault
LEDs are not lit.
Example of display with CO (ch 1), H2S (ch 2), Oxygen (ch 3) and CO2(ch 4) options installed
Figure 4: GSM-60 Operational Display
4.2 Alarm Set Points
There are two alarm set points for each installed channel of the GSM-60. The factory settings of these alarm set points are shown
in Table 3. Table 3: Typical Factory Alarm Set Points
Typical Channel #
Gas
Alarm 1, Flashing LED
Alarm 2, Steady LED
1
Carbon Monoxide
10 ppm
20 ppm
2
Hydrogen Sulfide
10 ppm
20 ppm
3
Oxygen Deficiency
19.5 % by volume
23.5 % by volume
4
Carbon Dioxide
500 ppm
1000 ppm
4
Hydrocarbon
5 ppm
10 ppm
The alarm set points can be changed within limits; see the maintenance section of this manual for the procedure.
If the CO concentration increases above that of the alarm set point, the associated red LED is lit, the associated relay
changes state, and the audio alarm is activated.
If the dew point increases above that of the alarm set point, the associated red LED is lit, the associated relay changes state,
and the audio alarm is activated.
If the oxygen content of the sample air decreases below the deficiency alarm set point, the associated red LED is lit, the
associated relay changes state, and the audio alarm is activated.
If the oxygen content of the sample air exceeds that of the abundance alarm set point, the associated red LED is lit, the
audio alarm is activated, and both the oxygen alarm relay and the oxygen high alarm relay change state.
The HC sensor can only detect and alarm to hydrocarbons with an Ionization Potential of less than 10.6 eV. See Appendix
B.
The HC sensor is broad range in nature and is unable to differentiate between different hydrocarbons.
The Alarm 1 differential value is the delay of the GSM-60 staying in alarm condition until after the measured reading has
returned past the alarm point by the differential value. Example: If the alarm set point is Λ10 and the differential is 2, the
GSM-60 will go into alarm at 10 and stay in alarm until the reading has dropped below 8.
CO 0 O2 20.9
H2S 0 CO2 300
CO
PPM
O
2
%
H2S
PPM
CO2
PPM

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ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
4.3 Alarm Latching or Differential Settings
An instrument is shipped with the alarms in the latching mode. The alarms may be independently configured in the non-latching
mode or differential setting by use of the maintenance menu.
See Section 5.3.3, for setting alarm 1 and alarm 2.
Standard Setting
IN THE LATCHING MODE: at the cessation of the condition which causes an alarm, the alarm indications do not cease, and the
alarm relay contacts do not revert to the non-alarm state, until the AUDIO DEFEAT /ALARM ACKNOWLEDGE switch is pressed.
An alarm can also be acknowledged by pressing the switch during the alarm condition; then at the cessation of the alarm
condition, alarm indications cease and alarm relays revert to the non-alarm state. After an alarm is acknowledged, alarms in
the latching configuration are re-armed to latch at the next alarm condition.
IN THE NON-LATCHING MODE: at the cessation of the condition that causes an alarm, the alarm indications automatically cease,
and the alarm relay contacts revert to the non-alarm state.
Differential Setting
The Alarm 1 differential value is the delay of the GSM-60 staying in alarm condition until after the measured reading has
returned past the alarm point by the differential value. Example: If the alarm point is Λ10 and the differential is 2, the GSM-
60 will go into alarm at 10 and stay in alarm until the reading has dropped below 8.
4.4 Audio Defeat
Pressing the AUDIO DEFEAT /ALARM ACKNOWLEDGE switch during an alarm temporarily silences the audio alarm. Relays and
alarm LEDs continue to function, in the alarm state, during an alarm condition. If the alarm condition persists, the audio alarm will
“chirp” every 20 seconds.
If after 15 minutes the alarm condition continues the audio alarm will reactivate at full intensity.
If any other alarm condition occurs while the audio alarm has been silenced it will force the audio alarm to reactivate
immediately.
4.5 Display
In clean air a display is shown in Figure 4.This position of the display is termed the "operational display". As explained below,
the display can be used to view other information by using the OPTION and SELECT switches.
Concentrations of CO and CO2 are given in PPM (parts per million parts of air). Dew point is given in degrees Fahrenheit at 55
PSIG; this can be changed to degrees Centigrade by pressing the SELECT switch. Oxygen concentration is given in percent by
volume.
When sample flow is reduced below a limit, the bottom line of the display flashes “Low Flow Alarm”.

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 13
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
4.6 Operational Menu
The operational menu allows the user to:
View alarm set point concentration values
View alarm ascending/descending trigger, latching and delay configurations
Enter the maintenance menu with the proper Password.
The operational menu is accessed with the OPTION and SELECT switches. The operational menu flow chart is shown in Figure 5,
Pressing the OPTIONswitch is indicated with a "O"
Pressing the SELECT switch is indicated with a "S".
If the instrument is left at any location in the operational or maintenance menus, other than the operational display, with no action
taken for a period of 45 seconds, it returns to the operational display.
Figure 5: GSM-60 Operation Menu Flow Chart
O
S
CH-1 CH-
3
CH-2 CH-4
O = Press Option switch
S= Press Select switch
O
No
Function
ΛL10 A1 vL19.5
vL-40 ΛD 500
O
No
Function
S
S
ΛL20 A2 Λ23.5
ΛL39 Λ1000
O
No
Function
S
Enter Maint Menu Enter Password
_
See Maintenance Menu Diagram
O
Sfor each active channel
CH1 SCALE (CO)
0 – 50 PPM
S
CH3 SCALE
(O2)
CH2 SCALE (H2S)
0 – 50
PPM
S
CH4 SCALE (CO2)
0 – 5000 PPM
S
O
O
O
Displays are examples of gases:
Channel 1 = Carbon Monoxide
Channel 2 = Hydrogen Sulfide
Channel 3 = Oxygen
Channel 4 = Carbon Dioxide
Displays are examples of Alarms
Λ- Indicates alarm triggered on
increasing value of reading
v- Indicates alarm triggered on
decreasing value of reading
Displays are examples of Alarms
L– Indicates alarm is in latching
mode.
(no Lpresent) – Indicates alarm
is in non-latching mode.
Displays are examples of Alarms
D– Indicates alarm is in
Differential Setting.
(no Dpresent) – Indicates alarm
is in Standard Setting.
ALARM1 Delays
(Seconds)
O
S
No
Function
S
50 mASPAN 30.0
68 5000
O
No
Function
5 5
5 5
Alternating
S
Relays 123456
[
=ON
[[[[[[
O
No
Function

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 14
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
4.7 Fault Indications
4.7.1 Low Flow Indication
A flow sensor is used to furnish a low flow indication. When the sample air pressure drops below preset levels, the fault light
and audio alarm are activated, and the display flashes “Low Flow Alarm”. If two sampling hoses are connected to one GSM-
60, the flow sensor can only detect a total flow fault condition. For example: a pump failure or both sampling hoses being
blocked. The system cannot detect a flow fault if only one of the two sampling hoses is blocked.
4.7.2 Other Fault Indications
Other fault indications are associated with sensor zero and calibration activities, and are described in the maintenance Section
5.0 of this manual.
4.8 Hydrocarbon Sensor Response
If a Hydrocarbon (HC) sensor is supplied with the GSM-60 instrument, it designed to detect hydrocarbon gases and vapors with an
ionization potential (IP) of 10.6 eV or less. Hydrocarbons with an IP of greater than 10.6 eV will NOT be detected. Please see
Appendix B for a list of common gases and vapors and their respective IP rating.
Unless otherwise noted Isobutylene is used as a calibration and reference gas.

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 15
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
5.0 Maintenance
The GSM-60 requires periodic sensor calibration and replacement. Calibration of toxic gas and oxygen sensor should be performed
immediately following installation, one month after installation and every 3 months thereafter. HC sensor should be calibrated
monthly. Oxygen and CO sensor have an estimated lifetime of 1 – 2 years. The CO2 sensor has an estimated lifetime of 3 years.
Other sensors vary. Sensors should be replaced when they will not calibrate or shortly before the end of the estimated lifetime.
5.1 Cleaning Instructions
CAUTION:Never spray a cleaning solution on the surfaces of the GSM-60 devices.
Clean the exterior of the GSM-60 enclosures with a mild soap solution on a clean, damp cloth. Do not soak the cloth with
solution so that moisture drips onto, or lingers on, external surfaces.
Under no circumstances should organic solvents such as paint thinner be used to clean instrument surfaces.
5.2 Maintenance Menu
5.2.1 Accessing Maintenance Menu
The GSM-60 maintenance menu is accessed by entering the proper password with the OPTION and SELECT switches. See
Section 5.2.2 Figure 6 for full Maintenance Menu flow chart.
Entrance to the maintenance menu is guarded with a four-digit Password. The factory default setting of the password is 1270.
When a valid numerical password is inserted, the user can enter the maintenance menu.
To enter the maintenance menu. Press the OPTION switch until “Enter Maint Menu” is displayed then press SELECT switch for
the Enter Password menu. Enter the valid password as described below.
In the "Enter Maint Menu" position
Press the SELECT switch "Enter Password ζ0" is displayed. Press SELECT switch once, to move cursor to next digit, this
will be the first digit of the password.
In the ζ000 position, the underline cursor is under the left digit.
Press the OPTION switch to change the left digit; select the correct digit.
Press the SELECT switch, which locks the digit in place and moves the cursor one digit to the right.
Continue this process until the four-digit password is complete. When a valid password is inserted in this manner, the display is
transferred to the "Calibration" portion of the menu. If an invalid password is inserted, you are returned to the Enter Maint
Menu display.
Example: Password Display (with factory installed password entered) and Flow Chart below.
To Calibration
See Section 5.2.2 Figure 6 for full Maintenance Menu flow chart.
Enter Password
1270
CO
PPM
O
2
%
O = Option Switch
S = Select Switch
H2S
PPM
O
S
S
Enter Password
ζ0000
Enter Maint Menu
Changes digit indicated by underscore cursor
Locks underscored digit and moves cursor to next digit
O(6)
Valid
Invalid
!

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 16
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
5.2.2 Maintenance Menu Flow Chart
The maintenance menu diagram is shown in Figure 6 Maintenance Menu Flow Chart. From the operational display, press the
OPTION switch 6 times; "Enter MAINTENANCE Menu" is displayed.
Figure 6: GSM-60 Maintenance Menu Flow Chart.
O = Press Option
S= Press Select
O
S
MAINTENANCE MENU
Exit maint menu
Press O
PTION
to return to top of maintenance menu.
Press S ELECT to return to operational menu.
See Section 5.3.9 for instructions on how to exit Maintenance Menus.
To/From
Operational
Display
From Operational Menu
Press O PTION (6 times)
S
Enter Maint Menu
O
S
Enter Password
0000
Changes digit indicated by underscore cursor
Locks underscored digit and moves cursor to next digit
O (6)
Valid
Invalid
O
S
MAINTENANCE MENU
Set New Password
Password
XXXX
O
S
Changes digit indicated by underscore cursor
Locks underscored digit and moves cursor to next digit
See Section 5.3.8 for changing password instructions.
O
S
Calibration
Select (Gas)
MAINTENANCE MENU
Calibration
Press O PTION until the channel to be Calibrated is displayed
See Section 5.3 for calibration instructions.
O
S
MAINTENANCE MENU
Set Alarm1
Alarm 1
Select: XX
Press O PTION until the gas alarm to be Set is displayed
See Section 5.3.3 for setting alarms instructions.
O
S
Alarm 2
Select: XX
MAINTENANCE MENU
Set Alarm2
Press O PTION until the gas alarm to be Set is displayed
See Section 5.3.3 for setting alarms instructions.
O
S
MAINTENANCE MENU
Set Alarm Delays
Alarm Delay
Select: XX
Press O PTION until the gas alarm delay to be Set is displayed
See Section 5.3.4 for setting alarms instructions.
O
S
MAINTENANCE MENU
Configure Alarms
Ch 1, 2, 3, 4
R1 L
Pressing O PTION
changes letter indicated by underscore cursor
See Section 5.3.5 for configuring relay instructions.
O
S
MAINTENANCE MENU
Relay Failsafes
Relay Failsafes
R:1 Failsafe ON
Pressing O PTION changes Failsafe setting from ON to OFF
See Section 5.3.6 for configuring relay failsafe instructions.
MAINTENANCE MENU
Scale mA Xmtrs
Press O
PTION
until gas to be Set-Up is displayed
See Section 5.3.2 for transmitter set-up instructions.
If installed
Scale mA Xmtrs
Select (Gas)
O
S
O
S
MAINTENANCE MENU
mA Output Span
mA Output Span
Select: (Gas)
Press O PTION until the gas span to be Set is displayed
See Section 5.3.7 for output span instructions.

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 17
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
5.3 Calibration for CO, O2, HC and CO2 (Gas Channels)
Calibration is the process of setting the instrument up to read accurately when exposed to a target gas. This is a two-step process.
A Low Calibration sets clean air reference point and the High Calibration function sets the sensitivity of the instrument.
Calibration equipment is available from ENMET to calibrate the GSM-60. A list of needed material is in Section 7.0. A
calibration adapter will have a fitting for the gas cylinder on one side, and a quick-disconnect to attach to the instrument on the
other.
You may exit the calibration section, at any time, by pressing and holding the OPTION switch for 3 seconds, if entering calibration
section by mistake or calibration gas is not available.
Wait 24 hours after initially supplying air and power to the GSM-60 sensor before initial calibration. It is not necessary to open
the Front Panel to make adjustment. The calibration functions are operated through the OPTION and SELECT switches on the front
panel.
After entering a valid password to maintenance menu, see Section 5.2.1, the calibration section is the first menu section; enter by
pressing the SELECT switch.
Supply sensor with clean air for Low Cal/Zero Cal setting and apply calibration gas for Hi Cal/Span Gas setting.
Press the SELECT switch "Calibration Select XX" is displayed. XX = the gas to be calibrated
Press the OPTION switch, if needed, to change to the gas to be calibrated.
Press the SELECT switch, the gas & current reading is displayed in upper portion of display. The mV reading & "Low Cal 0"
is displayed in the lower portion of display. This is the Low Cal setting, usually zero, clean air must be supplied to the sensor.
This reading needs to be at or near zero. If it is not, then a cylinder of clean 20.9 air should be used. See Figure 7 if this is
required.
Press the SELECT switch, that moves the cursor one digit to the right when the last digit is accepted the display will move to
"Hi Cal xx" gas calibration. xx = the level of gas to be used for calibration. The mV reading is shown in the upper right hand
corner of the display.
Apply calibration gas to sensor. See Figure 7. After about 1 minute and mV reading has stabilized.
Press the SELECT switch, that moves the cursor one digit to the right, when the last digit is accepted and the calibration is
successful the display will momentarily show Cal OK then slope and off set readings, before returning to the Calibration Menu
Repeat above steps for each channel to be calibrated.
NOTE:Instruments equipped with an oxygen sensor programmed with a range of 0 to 15% by volume require 99.999 % Nitrogen
(ENMET part number 03295-100) be used for the Low Cal/Zero Cal setting and 5% by volume Oxygen (ENMET part
number 03296-050) be used for Hi Cal/Span setting
To continue to next section, Press the OPTION switch.
Press OPTION switch until “Exit Maint Menu” appears and then press SELECT switch to return the instrument to the
Operational Display
Example: Full Calibration Flow Chart, for CO
From Valid Password Entry
O Press OPTION until the gas to be
Calibrated is displayed
O
S
S
Calibration
Select (Gas)
MAINTENANCE MENU
Calibration
CO:
XX
11
LowCal: 0000
S each digit
CO:
XX
14
HiCal: 0000
S each digit
Default Calibration Points
Gas
Low Cal
Hi Cal
CO
0
20
O2
N/A*
20.9*
CO2
0
1000
HC
0
10
O = Press Option
S= Press Select

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 18
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
N
OTE
:With twin tube input, the non-
calibration line must be plugged.
Figure 7: GSM-60 Calibration Connections
Calibration Process for MOS Sensors
The following calibration procedure must be followed whenever a 60-series part number appear in the part number of the
instrument, examples 04652-6200-0000, 04652-7083-6000
Humidification is required when calibration is performed. In addition to the standard flow demand regulator, cylinder of
calibration gas you need ENMET humidifier assembly part number 037000-000
Fill the humidifier with clean water to about ¾ full, connect the flow demand regulator to one side of the humidifier and
connect the other side of the humidifier to the GSM-60 calibration/sampling port.
Warning: Be sure that the flow direction is correct, note the arrow on the humidifier, failure to do so will cause damage to the
GSM-60 instrument
With the cylinder regulator and humidifier assembled follow the above steps to complete the calibration process
5.3.1A Low Cal/Zero Cal Adjust
A Low-Cal function should be performed only when the GSM-60 sensors are exposed to clean uncontaminated air. Use a
cylinder of 20.9% oxygen to provide a clean air reference if necessary. Attach the cylinder to the calibration adapter, attach the
adapter to the instrument and allow gas to flow over the sensor for up to 4 minutes.
Enter the maintenance menu by repeatedly pressing OPTION switch, until the maintenance menu is displayed. See Figure 6,
GSM-60 Maintenance Menu flow chart.
The first menu available is the Low Cal/Zero Cal.
Press the SELECT switch 4 times to perform a Low Cal.
If the Low Cal/Zero Cal is successful, the display will change to Hi Cal/Span Gas.
If you wish to Hi Cal/Span Gas the sensor apply calibration gas. Proceed to gas calibration Section 5.3.1B
If you wish to Exit the maintenance menu, Press and hold OPTION switch until the Maintenance Menu is displayed then
release. Then press OPTION switch until “Exit Maint Menu” appears and then press SELECT switch to return the instrument
to the Operational Display
If the Low Cal/Zero Cal is Not successful, sensor is outside of safe parameters to Low Cal, a “SLP/Off Set err” will be
indicated. Repeat Section 5.3.1 Low Cal/Zero Cal Adjust making sure to use a cylinder of 20.9% Oxygen.
Calibration/Sample Port
Fitting
Cylinder of Gas
Cylinder Valve
and Regulator
Example of Regulator
Humidifier
GSM-60 with OPTIONAL TWIN TUBE
To Cylinder of Gas
Quick Disconnect
Calibration Adapter with Humidifier - MOS

GSM-60
ENMET
Manual Revision Date – June 15, 2017
Page | 19
Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
5.3.1B High Cal/Span Gas Adjust
A High Cal/Span Gas should only be performed after a successful Low Cal/Zero Cal has been completed.
Press the SELECT switch, that moves the cursor one digit to the right when the last digit is accepted the display will move to
"HI Cal xx" gas calibration. xx = the level of gas to be used for calibration. The mV reading is shown in the upper right
hand corner of the display.
Apply calibration gas to sensor. See Figure 7. After about 1 minute and mV reading has stabilized.
Press the SELECT switch, that moves the cursor one digit to the right, when the last digit is accepted and the calibration is
successful the display will momentarily show Cal OK then slope and off set readings, before returning to the Calibration
Menu
Repeat above steps for each channel to be calibrated.
To continue to next section, Press the OPTION switch.
Press OPTION switch until “Exit Maint Menu” appears and then press SELECT switch to return the instrument to the
Operational Display
5.3.2 Set 4 –20mA Transmitter Scale
This section of the maintenance menu is installed when there are 4-20mA style sensors for dew point or other gases. This
function is normally performed at the factory and is not usually required to be performed in the field unless a new transmitter is
installed.
After entering a valid password into maintenance menu, the Scale mA Xmtrs section is the second menu section, if it is
installed, enter by pressing the SELECT switch
Press the SELECT switch "mA Xmter Scale: Select XX" is displayed. XX = the gas to be set up.
Press the OPTION switch, if needed, to change to the gas to be set up.
Press the SELECT switch, “Ch#: mAXmter: 4mA: 0000” is displayed
Press the SELECT switch, that moves the cursor one digit to the right when the last digit is accepted the display move to the
full-Scale mA Xmtrs menu
Press the SELECT switch, “Ch#: mAXmter: 20mA: 0000” is displayed
Press the SELECT switch, that moves the cursor one digit to the right when the last digit is accepted the display will return to
the Scale mA Xmtrs menu
Repeat these steps for each 4 –20mA transmitter.
Press OPTION switch until “Exit Maint Menu” appears and then press SELECT switch to return the instrument to the
Operational Display
Example: Sensor/Transmitter Set Up Flow Chart
O
S
S
mA Xmtr Scale
Select (Gas)
MAINTENANCE MENU
Scale mA Xmtrs
O Press O PTION until the gas to be
Set Up is displayed
CH#: XX mA Xmter
4mA: 0000
S each digit
CH#: XX mA Xmter
20mA: 0000
S each digit
O = Press Option
S= Press Select