ENMET ISA-300RAL User manual

ENMET
680 Fairfield Court
Ann Arbor, MI 48108
734.761.1270 Fax [phone]
www.enmet.com
ISA-300RAL
Operation and Maintenance Manual

ISA-300RAL
ENMET
Manual Revision Date – June 9, 2017
Page | 1
Manual Part No. – 80002-043
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
3.0 INSTALLATION................................................................................................................................................................................................ 7
3.1 Mounting of Instrument ............................................................................................................................................................................. 7
3.2 Sample Air Supply..................................................................................................................................................................................... 8
3.3 Power Supply............................................................................................................................................................................................. 8
3.4 Outputs....................................................................................................................................................................................................... 8
3.4.1 Relay Contacts.................................................................................................................................................................................... 9
3.4.2 Optional 4-20mA Outputs................................................................................................................................................................. 10
3.5 Installation Verification............................................................................................................................................................................ 10
4.0 OPERATION .................................................................................................................................................................................................. 11
4.1 Normal Operation Condition.................................................................................................................................................................... 11
4.2 Alarm Set Points ...................................................................................................................................................................................... 11
4.3 Alarm Latching ........................................................................................................................................................................................ 12
4.4 Audio Defeat............................................................................................................................................................................................ 12
4.5 Display..................................................................................................................................................................................................... 12
4.6 Fault Indications....................................................................................................................................................................................... 12
4.6.1 Low Flow Indication......................................................................................................................................................................... 12
4.6.2 Other Fault Indications..................................................................................................................................................................... 12
4.7 Operational Menu..................................................................................................................................................................................... 13
5.0 MAINTENANCE............................................................................................................................................................................................. 14
5.1 Cleaning Instructions ............................................................................................................................................................................... 14
5.2 Maintenance Menu................................................................................................................................................................................... 14
5.2.1 Accessing Maintenance Menu........................................................................................................................................................... 14
5.2.2 Maintenance Menu Flow Chart........................................................................................................................................................ 15
5.3 Calibration for CO, O2and CO2............................................................................................................................................................... 16
5.3.1A Low Cal/Zero Cal Adjust................................................................................................................................................................ 17
5.3.1B High Cal/Span Gas Adjust.............................................................................................................................................................. 17
5.3.2 Set 4 –20mA Transmitter Scale......................................................................................................................................................... 18
5.3.3 Set Alarm Points ............................................................................................................................................................................... 19
5.3.4 Set Alarm Delay................................................................................................................................................................................ 21
5.3.5 Relay Configuration.......................................................................................................................................................................... 22
5.3.6 Failsafe Configuration...................................................................................................................................................................... 23
5.3.7 Set Output Span Range ..................................................................................................................................................................... 23
5.3.8 Set New Password............................................................................................................................................................................. 24
5.3.9 Exit Maintenance Menu.................................................................................................................................................................... 24
5.4 Sensor Replacement................................................................................................................................................................................. 25
5.4.1 Gas Sensor............................................................................................................................................................................................. 25
5.4.2 Oxygen Sensor .................................................................................................................................................................................. 26
5.5 Flow Control Orifice................................................................................................................................................................................ 26
6.0 TECHNICAL DATA AND SPECIFICATIONS..................................................................................................................................................... 27
7.0 REPLACEMENT PART NUMBERS .................................................................................................................................................................. 28
7.1 ENMET part numbers for sensors and replacement parts:....................................................................................................................... 28
7.2 ENMET part numbers for Calibration equipment:................................................................................................................................... 28
APPENDIX A....................................................................................................................................................................................................... 29
8.0 TERMS AND CONDITIONS............................................................................................................................................................................. 30
8.1 Ordering Information............................................................................................................................................................................... 30
8.2 Delivery.................................................................................................................................................................................................... 30
8.3 Payment Terms ........................................................................................................................................................................................ 30
8.4 Warranty Information and Guidelines...................................................................................................................................................... 30
8.5 Return Policy............................................................................................................................................................................................ 30
9.0 INSTRUCTIONS FOR RETURNING AN INSTRUMENT FOR SERVICE................................................................................................................ 31

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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
List of Figures
Figure 1: Features of ISA-300RAL External.............................................................................................................................................5
Figure 2: ISA-300RAL Interior Features...................................................................................................................................................6
Figure 3: ISA-300RAL Mounting Dimensions..........................................................................................................................................7
Figure 4: ISA-300RAL Operational Display...........................................................................................................................................11
Figure 5:ISA-300RAL Operation Menu Flow Chart...............................................................................................................................13
Figure 6: ISA-300RAL Maintenance Menu Flow Chart .........................................................................................................................15
Figure 7: Connection of Calibration Gas Cylinder ..................................................................................................................................17
Figure 8: Shorting Clip ............................................................................................................................................................................26
Figure 9: Location Gas Sensor Manifold.................................................................................................................................................26
Figure 10: Carbon Monoxide Concentration ...........................................................................................................................................29
List of Tables
Table 1: Relay Failsafe Settings.................................................................................................................................................................9
Table 2: Sensor Output ............................................................................................................................................................................10
Table 3: Factory Alarm Set Points...........................................................................................................................................................11
Table 4: Factory Set Gas Alarm Delays...................................................................................................................................................21
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
!

ISA-300RAL
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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
1.0 Introduction
The ISA-300RAL is a compressed air monitoring instrument that measures and detects certain hazards in industrial compressed air
supply systems. The instrument is available with sensors that monitor air for carbon monoxide (CO), carbon dioxide (CO2) and for
variations in the oxygen (O2) content. The sensors can be used alone or up to four sensors can be used together. In the instrument, a
sample of the compressed air is passed over each sensor and the resulting electrical outputs are used to evaluate the air for the target
gases. Some features of the instruments are as follows:
•continuous monitoring of the sample air and continuous LCD display of gas and vapor concentrations
•menu driven operational and maintenance controls and calibration procedure
•audio and visual alarms indicate unsafe conditions
•alarm relay contacts available on terminals
•a fault relay and visual fault alarm
•low air flow fault indication and display
•alarm acknowledgement capability including audio defeat
•mA outputs for each target gas
NOTE:All specifications stated in this manual may change without notice.
1.1 Unpack
Unpack the ISA-300RAL 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 ISA-300RAL 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 ISA-300RAL is serialized. These numbers are on tags on the equipment and are on record in an ENMET database.

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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
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.
Sample Air Hose
A five-foot-long hose to conduct a sample of the air from the source to the instrument.
The hose has a Female quick release fitting and regulator. See Figure 1A.
Regulator
To connect to the compressed air line. Sample pressure to the ISA-300RAL should be set
to 55
PSI
. See note Figure 1A.
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.
•
A
UDIO
D
EFEAT
/
ALARM ACKNOWLEDGE
Switch
Directly below the
OPTION
switch.

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Figure 1: Features of ISA-300RAL External
NOTE: Typical gas reading & alarm locations, depending on instrument configuration, alarms & readings may be in alternate
locations
5ft, Supplied with Monitor
Figure 1A: Regulator and Sample Air Hose 1
N
OTE
:Typical facility airline pressures range from about 55 to 125
PSI
. The outlet
pressure of the regulator supplied with the monitor, which is connected to
the inlet of ISA-300RAL the, should be set at 55 PSI, ± 5PSI.
Female Quick Release
to Inlet Port to ISA-300RAL
¼” NPT
O
2
%
CO
ppm
Front Cover Latch
Male Quick Release Fitting
Input Port
Sample/Calibration
See note below
Audio Alarm
Fault LED
SELECT
Switch
Power LED
OPTION
Switch
A
LARM
ACKNOWLEDGE/
ALARM DEFEAT
Switch
*Visual Alarm O
2
(If Oxygen option is installed)
See *note below
*Visual Alarm CO
(See *note below)
Mounting Flanges
2 places
CO2
Display, see *note below
CO Reading
O2 Reading
CO2 Reading
Channel #1 Channel #3
Channel #2 Channel #4
Visual Alarm 2
ALARM 2
*Visual Alarm CO
2
(See *note below)

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Manual Part No. – 80002-043
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.
Sensor Manifold
The sample manifold, the carbon monoxide, carbon dioxide and oxygen sensors are
located under this housing.
Figure 2: ISA-300RAL Interior Features
Flow Sensor
Power Input
Terminal J23
Audio
Alarm
Relay Terminals
(6 places)
Aux Terminals
Optional (2 places)
Horn Terminal
Fuse Holders
0.630 Amp
(2 places)
Ground Screw
J21
Sensor
Manifold
Digital Communication
Terminals
4 – 20mA Output
Terminals
4 places

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ENMET
Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
3.0 Installation
3.1 Mounting of Instrument
The ISA-300RAL should be located near the pipe or tank containing the air to be monitored, and upstream from where the air is
being used. The ISA-300RAL must be installed such that it samples the compressed air before it reaches the users.
Mount the instrument on an appropriate vertical surface using the mounting flanges provided. Avoid areas with excessive
vibration. 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 ISA-300RAL to a drywall/sheetrock surface.
Dimensions are in inches. Figure 3: ISA-300RAL Mounting Dimensions
Mounting Holes
0.31” dia. 4 places

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Manual Part No. – 80002-043
3.2 Sample Air Supply
Tap the pipe or tank containing the breathing air and use appropriate fittings to connect the supplied regulator. The regulator must
be set to 55 PSIG.The instrument is designed to operate from an air supply pressure of 55 PSIG (±5PSI).
The sample air exits the instrument from the hole plug located on the bottom of the enclosure. Take care not to obstruct this exit
port.
3.3 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.
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.
3.4 Outputs
Two types of alarm outputs are available, relay contacts and 4-20mA outputs.
Figure 2A: Relay, Input and Output Terminals
Connector
4-20mA Input
Connector
4-20mA Input
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
Relay 5
Chanel 1-4
Alarm 2
Relay 4
Channel 4
Alarm 1
Relay 3
Channel 3
Alarm 1
Relay 2
Channel 2
Alarm 1
Relay 6
Chan. 1-4/System
Fault
Relay 1
Channel 1
Alarm 1

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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
3.4.1 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 below:
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. 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.

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Manual Part No. – 80002-043
3.4.2 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
Wiring requirements are the same as for the relays.
3.5 Installation Verification
All instruments are calibrated at the factory. You may, if a calibration kit is available, calibrate the CO, O2and CO2channels 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.

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Manual Part No. – 80002-043
4.0 Operation
4.1 Normal Operation Condition
With the ISA-300RAL 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 ISA-300RAL.The red alarm and
fault LEDs are not lit.
Example of display with CO (ch 1), CO2 (ch 2) and Oxygen (ch 3) options installed
Figure 4: ISA-300RAL Operational Display
4.2 Alarm Set Points
There are two alarm set points for CO, CO2and oxygen. The factory settings of these alarm set points are shown in Table 3.
Table 3: Factory Alarm Set Points
Typical Channel #
Gas
Alarm 1
Alarm 2
1
Carbon Monoxide
10 ppm
20 ppm
2
Oxygen Deficiency
19.5 % by volume
23.5 % by volume
3
Carbon Dioxide
500 ppm
1000 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 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 Alarm 1 differential value is the delay of the ISA-300RAL 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 ISA-
300RAL will go into alarm at 10 and stay in alarm until the reading has dropped below 8.
CO 0 O2 20.9
CO2 300
CO
PPM
O
2
%
CO2
PPM

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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
4.3 Alarm Latching
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 ISA-300RAL 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
ISA-300RAL 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 changed to furnish other information by using the OPTION and SELECT switches.
Concentrations of CO and CO2 are given in PPM (parts per million parts of air). 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”.
4.6 Fault Indications
4.6.1 Low Flow Indication
A flow sensor is used to furnish a low flow indication. When the sample air pressure drops below approximately 0.3 LPM, the
fault light and audio alarm are activated, and the display flashes “Low Flow Alarm”.
4.6.2 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.

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Manual Part No. – 80002-043
4.7 Operational Menu
The operational menu allows the user to:
View alarm set point concentration values
View alarm latching 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 OPTION switch 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:ISA-300RAL Operation Menu Flow Chart
S
S
S
O
O
O
O
S
CH-1 CH-
3
CH-2 CH-4
O = Press Option switch
S= Press Select switch
O
No
Function
ΛL10 A1 vL500
VL19.5 ΛD 500
O
No
Function
S
S
ΛL20 A2 Λ23.5
ΛL23.5 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
CH3 SCALE (CO2)
0 – 5000 PPM
CH2 SCALE (O2)
0.0 – 30.0 %
CH4 SCALE (HC)
0 – 5000 PPM
Displays are examples of gases:
Channel 1 = Carbon Monoxide
Channel 2 = Oxygen
Channel 3 = Carbon Dioxide
Channel 4 = Hydrocarbons
[– Indicates relay is engaged
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

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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
5.0 Maintenance
The ISA-300RAL 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. Oxygen and CO sensor
have an estimated lifetime of 1 – 2 years. The CO2 sensor has an estimated lifetime of 3 years. Sensors should be replaced when they
will not calibrate or shortly before the end of their estimated lifetime.
5.1 Cleaning Instructions
CAUTION:Never spray a cleaning solution on the surfaces of the ISA-300RAL devices.
Clean the exterior of the ISA-300RAL 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 ISA-300RAL 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 is allowed to 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
CO2
O
S
S
Valid
Enter Password
ζ0
Invalid
Enter Maint Menu
Changes digit indicated by underscore cursor
Locks underscored digit and moves cursor to next digit
O(6)
!

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ENMET
Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
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 or until; "Enter MAINTENANCE Menu" is displayed.
Figure 6: ISA-300RAL Maintenance Menu Flow Chart
O = Press Option
S= Press Select

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Manual Part No. – 80002-043
5.3 Calibration for CO, O2and CO2
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 Corporation to calibrate the ISA-300RAL. 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 ISA-300RAL 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 LowCal/Zero Cal setting and apply calibration gas for HiCal/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 & "LowCal 0"
is displayed in the lower portion of display. This is the LowCal 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
"HiCal 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.
Example: Full Calibration Flow Chart, for CO
From Valid Password Entry
O
S
S
Calibration
Select (Gas)
MAINTENANCE MENU
Calibration
O Press O PTION until the gas to be
Calibrated is displayed
CO:
XX
11
LowCal: 0000
S each digit
CO:
XX
14
HiCal: 0000
S each digit
Default Calibration Points
Gas
LowCal
HiCal
CO
0
20
O2
N/A
20.9
CO2
0
1000
O = Press Option
S= Press Select

ISA-300RAL
ENMET
Manual Revision Date – June 9, 2017
Page | 17
Manual Part No. – 80002-043
Figure 7: Connection of Calibration Gas Cylinder
5.3.1A Low Cal/Zero Cal Adjust
A Low-Cal function should be performed only when the ISA-300RAL sensor 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,
ISA-300RAL 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.
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 "HiCal 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 on too next section Press the OPTION switch.
Cylinder of Gas
Cylinder Valve
and Regulator
Calibration/Sample
Port

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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
5.3.2 Set 4 –20mA Transmitter Scale
This section of the maintenance menu is installed when there are 4-20mA style sensors for 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 the OPTION switch, to continue on to the next section of the Maintenance Menu.
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

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Manual Revision Date – June 9, 2017
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Manual Part No. – 80002-043
5.3.3 Set Alarm Points
Factory alarm set points are discussed in Section 4.2, See Table 3. To change the alarm points, you must enter the maintenance
menu.
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.
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.
After entering a valid password:
Press the OPTION switch until; “Maintenance Menu Set Alarm1” appears on display.
Press the SELECT switch, "ALARM1 Select: XX" is displayed. XX = the gas of alarm point to be changed.
Press the OPTION switch until, desired gas is displayed.
Press the SELECT switch; "ALARM 1 V" is displayed, with the flashing placeholder underscore cursor, under the left
most character, Λfor ascending trigger point or Vfor descending trigger point indicator.
Press the OPTION switch to toggle between Λand V; select the correct indicator.
Press the SELECT switch to lock in the correct indicator. "ALARM 1 STD" is displayed
Press the OPTION switch to toggle between STD and DIFF; select the correct indicator.
Press the SELECT switch to lock in the correct indicator.
If STD is selected, "ALARM 1 VL" is displayed, to set alarm 1 value.
The next character is the latching indicator Lor NOLpress the OPTION switch to toggle the latching mode.
The next character is the negative sign –press the OPTION switch to toggle the negative sign.
The next characters are the alarm 1 value, press the OPTION switch to select each digit of the value
When the last digit is accepted display returns to the "Set Alarm1" position.
If DIFF is selected, "ALARM 1 Λ DIFF 000" is displayed, to set alarm 1 differential.
The next characters are the alarm 1 value, press the OPTION switch to select each digit of the value
Press the SELECT switch to lock in the correct character and move the cursor to the right.
"ALARM 1 DIFF BAND 000" is displayed, press the OPTION switch to select each digit of the value.
The next characters are the alarm 1 differential value, press the OPTION switch to select each digit of the value
Press the SELECT switch to lock in the correct character and move the cursor to the right.
When the last digit is accepted, display returns to the "Set Alarm1" position.
Note: The Alarm 1 differential value is the delay of the ISA-300RAL 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 ISA-300RAL will go into alarm at 10 and stay in alarm until the reading has dropped below 8.
Repeat for each sensor alarm 1 to be changed.
Press the OPTIONswitch to move to alarm 2, "Set ALARM2" is displayed.
Repeat as for alarm 1 using the STD section.
Press OPTION switch until “Exit Maint Menu” appears, then press SELECT switch to return the instrument to the
Operational Display