Net Safety MLP-A-SC1100 User manual

Part Number: MAN-0047 Rev 12
July 24, 2009

MILLENNIUM
Combustible Gas Detector
User Manual
Models:
MLP- A/AR/AD- SC1100
MLP- LP-A/AR/ARS -SC1100

Part Number: MAN-0047 Rev 12
July 24, 2009
IMPORTANT INFORMATION
This manual is for informational purposes only. Although every
effort has been made to ensure the correctness of the information,
technical inaccuracies may occur and periodic changes may be made
without notice. Net Safety Monitoring Inc., assumes no
responsibility for any errors contained within this manual.
If the products or procedures are used for purposes other than as
described in the manual, without receiving prior confirmation of
validity or suitability, Net Safety Monitoring Inc., does not guarantee
the results and assumes no obligation or liability.
No part of this manual may be copied, disseminated or distributed
without the express written consent of Net Safety Monitoring Inc.
Net Safety Monitoring Inc., products are carefully designed and
manufactured from high quality components and can be expected to
provide many years of trouble free service. Each product is
thoroughly tested, inspected and calibrated prior to shipment.
Failures can occur which are beyond the control of the manufacturer.
Failures can be minimized by adhering to the operating and
maintenance instructions herein. Where the absolute greatest of
reliability is required, redundancy should be designed into the
system.
Warranty
Net Safety Monitoring Inc., warrants its sensors against defective
parts and workmanship for a period of 24 months from date of
purchase; other electronic assemblies for 36 months from date of
purchase.
No other warranties or liability, expressed or implied, will be
honoured by Net Safety Monitoring Inc.
Contact Net Safety Monitoring Inc., or an authorized representative
for details.
We welcome your input at Net Safety Monitoring. If you have any
comments please contact us by phone, at the address below or visit
our web site and complete our on-line customer survey: www.net-
safety.com.
Contact Information
Net Safety Monitoring Inc.
2721 Hopewell Place NE
Calgary, AB
Canada
T1Y 7J7
Telephone: [phone] Fax: [phone]
www.net-safety.com
E-mail: [email protected]

NetSafetyMonitoringInc.
3
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Table of Contents

Introduction.......................................................................................5
The Product........................................................................................5
TheSensor..................................................................................5
TheController(Transmitter)......................................................5
TheManual................................................................................5
SECTION 1: PLAN..........................................................................6
1.1 LOCATE CONTROLLER / SENSOR....................................6
SECTION 2: Install............................................................................8
Unpack...........................................................................................8
SECTION 3: Wire.............................................................................9
Field Installation............................................................................9
Seal.................................................................................................9
ConnectingWires.....................................................................10
BoardAssembly.......................................................................10
Sensor and Controller..................................................................11
RelayBoard..............................................................................12
RS‐485Communication............................................................12
SensorSeparation........................................................................12
CURRENTOUTPUT.......................................................................12
NON‐ISOLATEDANDISOLATEDPOWERCONFIGURATIONS........13
RemoteReset...............................................................................13
ModbusTermination...................................................................13
SECTION 4: OPERATE..................................................................14
CalibrationButton....................................................................16
MagneticReedSwitch..............................................................16
PowerUp..................................................................................16
CurrentLoopMeasurement(TestJacks).................................16
StatusLED................................................................................16
TheMainMenu............................................................................17
MainMenuFunctionality.........................................................17
SECTION 5: Calibrate.....................................................................17
Calibration Procedure..................................................................17
StepsinCalibrationProcedure.....................................................18
RemoteCalibration......................................................................18
AbortCalibration......................................................................19
SensorLifeCheck.....................................................................19
SensorNearEndofLife
............................................................19
EndofSensorLife,ReplaceSensor..........................................19
CalibrationFailure....................................................................19
SECTION 6: Monitor.......................................................................19
Review Relay Settings.................................................................19
Set Relay Option..........................................................................19
Stepsinsettingrelayoptions.......................................................20
EnterRestrictedMenu.................................................................20

NetSafetyMonitoringInc.
4
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Extend Sensor Separation............................................................21
Set Low Power Options - Optional..............................................21
Select Display Language..............................................................21
Modbus Options...........................................................................21
NodeAddress...........................................................................21
BaudRate.................................................................................22
Alarms..........................................................................................22
SensorFault..............................................................................22
SensorDrift..............................................................................22
Gas Present...................................................................................22
SensorLife................................................................................22
SensorGuard............................................................................23
Reset.............................................................................................23
ManualReset...........................................................................23
RemoteReset...........................................................................23
Outputs.........................................................................................23
Relays(Optional)......................................................................23
Modbus....................................................................................24
Current.....................................................................................24
SECTION 7: Maintain.....................................................................24
Periodic Response Check.............................................................24
Troubleshoot................................................................................24
Table6:Troubleshootingguide...............................................25
How to Return Equipment...............................................................26
SpareParts/Accessories...............................................................26
FACE ROTATION OPTION......................................................27
RotatePCBAssembly...............................................................27
AppendixA:................................................................................29
ElectrostaticSensitiveDevice(ESD).................................................29
AppendixB:ResistanceTable.....................................................30
AppendixB:ResistanceTable(cont’d).............................................31
AppendixC:SensorSpecifications..............................................32
ControllerSpecifications..................................................................33










NetSafetyMonitoringInc.
5
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Introduction
The Millennium series is a part of Net Safety's innovation in a line of
continuously evolving industrial gas detectors and sensors. The
microcontroller based system provides fast, accurate and continuous
monitoring of gases in extreme environments.
The Product
The Sensor
The SC1100 combustible gas sensor is a proven, poison resistant,
pellistor sensor utilizing active and reference catalytic beads in a
Wheatstone Bridge configuration. Its integrated design ensures
accurate and repeatable response in the most severe environments.
The Controller (Transmitter)
The Millennium Controller has an Explosion-Proof Housing, rated
Class 1, Division 1, Groups B, C, and D for hazardous applications.
It was designed for either a 1-man, intrusive calibration or 2-man
non-intrusive calibration. The Controller has convenient user
interface functionality to make installation, operation and
maintenance easy.
The Manual
The manual has been designed to make installation of the
Millennium product easy. To ensure proper installation, follow the
steps outlined in the following pages. If you encounter problems
during operation, consult the troubleshooting section or contact your
sales representative.

SECTION 1 PLAN
SECTION 2 INSTALL
SECTION 3 WIRE
SECTION 4 OPERATE
SECTION 5 CALIBRATE
SECTION 6 MONITOR
SECTION 7 MAINTAIN







NetSafetyMonitoringInc.
6
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
SECTION 1: PLAN

1.1 LOCATE CONTROLLER / SENSOR
Prior to the installation process, a location plan for placing the
controller and sensor should be developed. Although there are no
absolute rules determining the quantity and location of a sensor or
controller, the following points should be considered when planning
the installation.
•Locate the controller where it will be accessible and visible.
•Carefully locate sensor in an area where gases may
potentially accumulate.
•Use redundant systems to enhance protection and reliability.
•Light gases tend to rise; heavy gases tend to accumulate in
low areas.
•Consider the air movement patterns within the facility.
•Consider the construction of the facility (such as trenches
where heavy gases may accumulate or peaks where light
gases may accumulate)
•Seek advice from experts knowledgeable about the primary
gas to be detected.
•Use common sense and refer to the regulatory publications
that discuss guidelines for your industry. The two most
common installations options are as follows.
Option 1
Locate the sensor separate from the controller using a Certified
Junction Box. If the Net Safety Multi-purpose Junction Box is
being used, refer to MAN-0081 for terminal designations.
The controller is located near eye- level. Conduit is run from the
controller to the sensor. A Calibration Cup (CCS-1) can be attached
to the sensor. Tubing can be run from the CCS-1 to a convenient
location accessible for calibration gas to be injected.
Option 2
The sensor is attached directly to the controller. See “Wiring –
Controller and Sensor” for details. The CCS-1 and tubing is used to
facilitate calibration.
TIP: The Calibration Cup (CCS-1) allows for tubing to be affixed to
a sensor mounted in remote locations. The tubing s directed to a
level, usually close to the controller, for easy injection of calibration
gas. The calibration cup can also act as a splash guard, protecting
sensors mounted low to the ground.
Figure 1: Locate Sensor/Controller - Separated
CCS
‐
1

NetSafetyMonitoringInc.
7
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Figure 2 below shows the Controller with sensor and the Multipurpose Junction box with sensor attached.
Figure2:DimensionalDrawing
Multi-
p
ur
p
ose Junction box with senso
r
Controller with senso
r

NetSafetyMonitoringInc.
8
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
SECTION 2: Install
Unpack
Carefully remove all components from the packaging. Check components against the enclosed packing list and inspect all components for obvious
damage such as broken or loose parts. If you find any components missing or damaged, notify the representative or Net Safety Monitoring
immediately.

Figure 3: Components










External Equipment
It is necessary that reliable monitoring and indicating devices or systems be connected to the detector. These devices must be designed to produce
clear visual and audible danger signals when high signal levels occur.
Millennium Faceplate
SC1100 Sensor
Ribbon connecting
faceplate/controller
Controller Housing
cover
Controller Base Housing

NetSafetyMonitoringInc.
9
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Mount
The controller should be mounted near eye-level and be easily
accessible for calibration and maintenance purposes. The sensor
should be placed where gas is likely to accumulate.
Ensure all devices are securely mounted, taking into consideration all
requirements.
SECTION 3: Wire

Field Installation
Warning Wiring codes and regulations may vary. Wiring
must comply with applicable regulations relating to the installation
of electrical equipment in a hazardous area and is the responsibility
of the installer. If in doubt, consult a qualified official before wiring
the system. See some wiring considerations below.
•If the 4-20 mA signal is not used, connect a jumper between
the 4-20 mA terminal and the Common terminal.
•The use of shielded cable is highly recommended for signal,
input, output and power wires to protect against interference
caused by extraneous electrical or electromagnetic 'noise'.
•In applications where the wiring cable is installed in conduit,
the conduit must not be used for wiring to other electrical
equipment.
•The maximum distance between sensor and controller is
limited by the resistance of the connecting wiring, which is a
function of the gauge wire being used. See Appendix B.
•When developing a RS-485 chain of devices, the last device
in the chain requires end of line termination.
•RS-485 connection 2-wire, multipoint serial line.
Seal
The use of seals is recommended to further protect the system
against any unwanted water ingression, and equipment should be
installed according to applicable local electrical codes. Seals are
especially recommended for installations that use high-pressure or
steam cleaning devices in proximity to the transmitter and/or sensor.
•Water-proof and explosion-proof conduit seals are
recommended to prevent water accumulation within the
enclosure.
•Seals should be located as close to the device as possible and
not more than 18 inches (46 cm) away.
•Explosion-proof installations may require an additional seal
where conduit enters a non-hazardous area. Ensure
conformity with local wiring codes.
•When pouring a seal, use a fibre dam to ensure proper
formation of the seal. Seals should never be poured at
temperatures below freezing.
•The jacket and shielding of the cable should be stripped back
to permit the seal to form around the individual wires. This
will prevent air, gas and water leakage through the inside of
the shield and into the enclosure.
•It is recommended that explosion-proof drains and conduit
breathers be used. In some applications, alternate changes in
temperature and barometric pressure can cause 'breathing'
which allows moist air to enter and circulate inside the
If necessary use the Face Rotation Option to mount the
Millennium Controller at a different orientation. Refer to “Face
Rotation Option” for detailed instructions.

NetSafetyMonitoringInc.
10
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
conduit. Joints in the conduit system are seldom tight enough
to prevent this 'breathing'.
Connecting Wires
1. Use a small screw driver to gently press down and hold the
spring connector open.
2. Insert appropriate wire into open connector hole.
3. Release screw driver to secure wire.
Figure 4: Securing wires
Board Assembly
There are three different user-allowed removable boards; relay board
(Solid State or Electromechanical), Option board and Modbus board.
These Boards are field replaceable. Simply loosen the locking
standoffs, remove one board, insert the other board and tighten
screws. Depending upon requirements, either an Electromechanical
or Solid State Relay Board module can be used.
Note: Boards are susceptible to ESD. Refer to Appendix A
Electrostatic Sensitive Device (ESD)"
Solid State Relay Board
Fault +
-
Low +
-
High +
-
Electromechanical Relay Board
FNO
Fault
Normally open
FCOM Common
FNC Normally closed
LNO
Low
Normally open
LCOM Common
LNC Normally closed
HNO
High
Normally open
HCOM Common
HNC Normally closed
Modbus
Terminals
A
B
COM
-
Terminal Board
Option Board
Sensor Board
Figure 5: Millennium Module Boards

NetSafetyMonitoringInc.
11
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Sensor and Controller

Warning Power to the unit must be OFF before wiring.
Also ensure area is de-classified before removing housing cover.
Note: The Sensor may be factory installed to the Controller. If
so, you need only connect the Power Terminals.
1. Remove the Controller’s Housing Cover.
2. Connect the sensor to the Sensor Terminals (if necessary)
and the Power Terminals to power and output signal wires.
3. Turn controller on (put ON/OFF Switch in ‘ON’ position).
4. Replace Controller’s Housing cover. Apply power to unit.
5. Ensure display reads Start Delay, Status LED is Red Slow
Flash and current output displays 3.0 mA. This is the start-up
delay sequence which will last approximately 90 seconds.
Refer to Tables 1and 2 along with Figure 6, for wiring.
Sensor Terminals
Sensor
Wire Terminal designation
White ↔Wht(+)
Red ↔Red
Black
Blank space
↔Blk(-)
Shld
Note the terminal designations on sensor terminal board i.e. Wht (+),
Red, Blank space (no connection), Blk (-) and Shld.
Power Terminals
Controller
(Terminal Board)
Power Connections
RST ↔Remote Reset
+24VDC ↔Power(+)
COM ↔Power(-)
4-20 ↔Current loop output
ISO ↔+24V isolated 4-20
Figure 6: Wiring - Controller and Sensor
A
B
Com
-
Modbus RTU
Terminal to PLC
RST
+24VDC
Com
4-20
IS0
Wht
Red
Blk
Sensor
Terminal
Power
Terminal
SC1100 Sensor
Sensor
Wires
Table 2: Controller Terminal connection
Table 1: Sensor Terminal connection
Sensor
Board
Terminal
Board

NetSafetyMonitoringInc.
12
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Note: If the 4-20 mA signal is not used, connect a jumper between
the 4-20 terminal and the COM terminal on the Terminal Board.
Relay Board
Refer to Figure 5, “Millennium Module Boards" for relay board
location and termination.
RS-485 Communication
Connect devices in a chain via the Modbus terminals. The last device
in the chain requires end of line termination. Refer to “Modbus
Termination”.
Sensor Separation
Since the sensor must be located where gas is likely to accumulate
and the controller where it can be easily reached, it is often necessary
to “separate” the controller and sensor. This is done with the aid of
the Sensor Separation kit. The Sensor Separation kit is composed of
a Net Safety Multi-purpose Junction Box and terminal strip. For
terminal definitions refer to the Multi-purpose Junction Box
manual (MAN-0081).
Shielded copper instrument wire (minimum 18 AWG) should be
used for separations up to 75 feet. Shielded copper instrument wire
(minimum 16 AWG) should be used for separations up to 150 feet.
Note: Factory default for Sensor Separation is 0-75 feet.
The actual physical distance between the sensor and controller
must be defined. See "Extend Sensor Separation for instructions on
setting the sensor separation distance.
Note: If the 4-20 mA signal is not being used, connect a jumper
between the 4-20 mA terminal and the COM terminal on the
Terminal Board.
CURRENT OUTPUT
To set the current output, simply move the jumper located on
the Terminal Board near the power terminals, to the isolated or
non isolated current position. Refer to Figure 7.
Note: Unless otherwise specified, all models ship with this
jumper in the non-isolated current position (Pin 2 and Pin 3
jumpered). Refer to Figure 7.
Figure 7: Jumper Position








Jumper positions to set
power source for current
output.
Isolated & Non-Isolated
Current Jumper - Place
Jumper (shorting jack) over
Pin 3 and Pin 2 (default
position) for Non-Isolated
configuration (source). Place
Jumper over Pin 1 and Pin 2
for remaining configurations.
See Figure 8.
Termination Jumper –
Non- functional in this
application and can be
placed in any position or
removed.
Power Terminals
Sensor Terminals
Sensor Board
Terminal Board

NetSafetyMonitoringInc.
13
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
NON-ISOLATED AND ISOLATED POWER
CONFIGURATIONS
For current source using Non-Isolated configuration, the jumper
must remain in the default position (Pin 2 and Pin 3 jumpered). The
jumper is placed over Pin1 and Pin 2 for current sink using Non-
Isolated configuration.
For Isolated configuration using a separate power supply to isolate
the current loop, the jumper must be placed over Pin 1 and Pin 2 for
source and sink. See Figure 7 and Figure 8.
Note the Jumper position for each configuration.
Figure 8: Current Source and Sink Drawing






Remote Reset
If the Millennium relays are set for latching a remote reset can be
done to reset the relays. This is done with a normally open Push
Button Switch connected between the RST and COM terminals on
the Terminal Board. See Figure 9.
Figure 9: Remote Reset




Modbus Termination
Devices can be networked in a daisy chain. The device located at the
end of the chain requires end of line termination. Place both jumpers
over the pins as shown in the Figure 10 below.
Figure 10: Modbus Termination Jumpers





Terminal Board
Power Terminal
Strip
Modbus Board
JP1
JP2

NetSafetyMonitoringInc.
14
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
SECTION 4: OPERATE
Figure 11: Controller Functionality






Magnetic Reed Switch –provides non-
intrusive access for programming,
zeroing and resetting.
-Place magnet against housing as
indicated for less than one second to
initiate a basic system reset (clear
latched alarm) and make selections.
–Place magnet against housing as
indicated and hold to access, select,
view settings and zero.
ON/OFF Switch –used to turn
controller on and off. Housing must be
removed to access.
Scrolling 8 character display- provides
various status messages and prompts.
Refer to “Status LED’s, Display
Messages and Current Loop”
Pull Here knob-unscrew the two
screws and pull to remove faceplate.
Removal allows access to terminal
boards. The face plate remains
attached to the ribbon cable
Status Light (flashes Red or Green) to
indicate status of unit. Refer to “Status
LEDs, Display Messages”, for detailed
explanation.
Setup Button –provides intrusive
access for programming, zeroing and
resetting. -Push for less than one
second to initiate a basic system reset
(clear a latched alarm) and make
selection. -Push and hold to program,
view current settings and zero.
Current Output Check –test jacks to facilitate current loop measurements without breaking
external current loop. To take current loop measurements ensure wiring is correct and
current loop is closed, and then follow steps below
-Set meter on mA scale and insert meter leads into test jacks.
-Set external devices to bypass, if necessary, to avoid unwanted alarm response
-Perform simulated tests to check output
-Re
m
ove meter leads from test
j
acks and return external devices to normal
Pull Here knob

NetSafetyMonitoringInc.
15
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
State Current
output Status LED Red or Green Display
Calibrate sensor 3.0 mA N/A N/A
Normal
operation 4.0 mA Green blip/blink 00 %LEL
Start-up delay
(90 seconds) 3.0 mA
Red
Slow
flash
Start delay
Access main
menu & options 3.0 mA N/A Switch on (10→0)
Memory error 2.5 mA Red slow
flash Memory error
Sensor lead open 2.5 mA Red slow
flash Sensor Fault
Excess drift
(>10%) 2.5 mA Red blip/blink Neg. drift
Auto Zero set 3.0 mA Green
Solid
Apply
clean air
Apply cal. gas 3.3 mA Red fast
flash Apply 50% span gas
Span is set,
remove gas 3.6 mA Green solid
Remove
gas
Calibration
successful 3.6 mA Green solid
Cal.
complete
Sensor guard 20.0 mA Red
Solid 100%LEL
Gas present >4-20 mA Red
blip/blink 1-100% full scale
Failed calibration 3.0/3.3
mA
Red
flash
Green
flash Fail cal.
RTU Status Registers and meaning
RTUstat_fault 0x0001 Fault(sensor)
RTUstat_low_alarm 0X0002 Low alarm tripped
RTUstat_high_alarm 0X0004 High alarm tripped
RTUstat_low_alarm_latched 0X0008 Low alarm latched
RTUstat_high_alarm_latched 0X0010 High alarm latched
RTUstat_lel_60_latched 0X0020 60% LEL latched
RTUstat_lel_100_latched 0x0040 100% LEL latched
RTUstat_powerUp 0x0080 Power up delay
RTUstat_cal_cycle 0X0100
Calibration cycle in
progress
RTUstat_zeroing 0x0200 zeroing
RTUstat_apply_span_gas 0x0400 Apply span gas
RTUstat_calibrating 0x0800 Calibrating
RTUstat_remove_gas 0x1000 Remove gas
RTUstat_cal_complete 0x2000 Calibration complete
RTUstat_mem_error 0X4000 Memory error
Note: Register 40001 = LEL output (read only)
Register 40002 = RTU status (read only)
Register 40101 = Reset latched relays (write)
Table 3: Status LEDs, Display messages and current loop Table 4: RTU Status re
g
ister
(
40002
)
Read onl
y
(
binar
y)

NetSafetyMonitoringInc.
16
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Calibration Button
The Calibration Button provides access to the Millennium’s Main
Menu, which in turn allows calibration and options to be reviewed
and set. Refer to Figure 11, “Controller Functionality" , for more
information.
•Press and hold the Calibration Button to calibrate and
access Main Menu.
•Briefly press to make a selection (select YES?).
Warning Do not open the controller in a classified area (Do
not open when an explosive atmosphere may be present). Do not
power up the system with the housing cover removed unless the area
has been de-classified.
Magnetic Reed Switch
The Magnetic Reed Switch is provided to avoid opening the housing
in an environment where gas may be present. The Magnetic Reed
Switch functions in the same manner as the Calibration Button but in
a non-intrusive manner. Refer to Figure 11, “Controller
Functionality", for more information.
When using the magnet:
Place and hold the magnet to the Controller’s Housing (10 o’clock
position) to calibrate and access Main Menu.
Briefly place the magnet to the Controller’s Housing (10 o’clock
position) to make a selection (select YES?).
Power Up
Turn the power switch on. A 90 second warm-up routine will begin.
The display reads Start Delay Millennium Net Safety, the Status
LED will flash slow red and current output displays 3.0 mA.
When power is applied, the system is automatically tested to ensure
proper functionality.
After warm-up, the controller will enter normal operation, the
display reads 00 %LEL, Status LED will blip/blink Green and
analog output will change to 4.0 mA.
Current Loop Measurement (Test Jacks)
Use a standard meter to measure current loop during various states.
The Controller’s Housing cover must be removed to access the Test
Jacks.
Refer to Table 3: "Status LEDs, Display Messages and Current
Loop,” for a detailed list and Figure 11, “Controller Functionality",
for more information.
Status LED
The Status LED will remain solid, flash, blip and/or blink, either Red
or Green, to indicate various states. Refer to Table 3, “Status LEDs,
Display Message”.

NetSafetyMonitoringInc.
17
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
The Main Menu
The Main Menu provides access to various functional settings and
viewing of current settings.
•Calibrate Sensor.
•Review Relay Settings (optional) - Review the current Fault,
Low and High alarm settings. This is a read only option.
•Set Relay Options (optional) - Set the Low and High alarm
settings.
•Restricted Menu - Set the sensor separation distance and
choose low power options.
•Select a display language - English, Spanish or French.
•Select Modbus Options (option only available if Modbus
board is used i.e. digital model).
Note: The current output will drop to 3.0 mA while accessing the
Main menu.
Accessing the Main Menu
There are two ways to access the Main Menu:
•Calibration Button found on the faceplate (the housing cover
must be removed to access)
•Magnetic Reed Switch (a magnet must be used to activate)
Main Menu Functionality
1. Ensure that the controller has been turned on and no fault is
present.
2. Hold the magnet against the Reed Switch or press and hold
the Calibration Button until the message Switch On displays
and the countdown (10 to 0) finishes.
3. An option will scroll across the display followed by the
prompt YES?
4. To select an option, momentarily place the magnet to the
Reed Switch or press the Calibration Button at the YES?
prompt.
5. If you do not wish to select that option wait until the next
option appears and then select YES?.
6. A selection is acknowledged with a flashing YES.
7. If no option is selected, the controller returns to 00 %LEL
(normal operation).
SECTION 5: Calibrate
Calibration Procedure
Warning The calibration procedure requires about 5 minutes
to complete. If gas is not applied at the appropriate time, a
calibration failure may occur. Refer to "Calibration Failure” for
specific information.
For accurate performance, the Millennium should be calibrated using
50% span of the specific gas of concern. The concentration of gas,
corresponding to 100% of full scale, is converted to a linear 4 to 20
mA output signal which can be powered from the primary dc supply
of the instrument. Power up the unit for at least 4 hours BEFORE
the first calibration.
The following calibration procedure should be followed to ensure an
accurate correlation between the 4 to 20 mA output signal and the
gas concentration.
Warning To compensate for distance when remotely
calibrating (sensor wired for separation), decrease the tubing
diameter or increase the calibration gas flow rate between canister
and sensor. Always confirm calibration by applying gas directly at
the sensor.

NetSafetyMonitoringInc.
18
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Figure 12: Calibration Procedure
Steps in Calibration Procedure
Refer to "Remote Calibration”, if remote calibration is to be
performed.
1. Confirm successful power up of controller—LED Green
Blip/blink every 2 seconds; no fault indicated.
2. Flow certified Clean AIR at a rate of 0.5 litres per minute
through the calibration cup for 1 minute to ensure clean air
environment.
3. Press and hold the Calibration Button or use the Reed Switch
to access the Main Menu and wait for countdown (10-0) to
complete.
4. When Calibrate Sensor YES? displays, use the Calibration
Button or Reed Switch to select YES? Selection will be
confirmed by a flashing YES.
5. The prompt Methane YES? will display. If calibrating for
methane use the Calibration Button or Reed Switch to select,
otherwise (for another target LEL gas) ignore and wait for
next prompt.
Note: The purpose of the prompt “Methane YES ?” is for
activating the sensor life feature for methane gas only.
6. When Apply Clean Air displays apply clean air.
7. Wait for Apply 50% Span Gas to display and apply specific
LEL gas at a rate of 0.5 litres per minute (use 1.0 litre per
minute for remote calibration).
8. The display will show Calibrating as gas is detected.
9. Remove span gas when the message Remove Gas displays
(Status LED Green solid and 3.6 mA output).
10. The message Cal Complete will display when calibration is
completed.
11. Apply clean air again to purge system.
Note: Always apply test gas after calibration to verify operation.
Remote Calibration
The preferred tubing has an inside diameter of 3/16"; stainless steel
tubing is excellent, plastic tubing is good. Within 10ft/35m, a flow
rate of 0.5 litre per minute can be used but 1.0 litre per minute is
recommended. Always use 1.0 litre per minute for distances
(calibration tube lengths) between10ft to 100ft. Contact Net Safety if
a remote calibration distance is greater than 100 ft/30 m is required.
Display:
Action:
Calibrate
sensor Yes?
Methane? Apply clean Air Apply 50%
Span Gas
Calibrating
Remove Gas Cal. Complete
Select Yes? Select Yes? for
methane or ignore
message if target
LEL gas is not
methane
Apply clean Air Apply specific
LEL gas
Remove Gas Apply clean air to
purge the system
Place system
into Bypass if
necessary
Stop Bypass if
necessary

NetSafetyMonitoringInc.
19
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Abort Calibration
The Calibration procedure can be aborted. When the display shows
Apply 50% Span Gas, press and hold the Reed Switch or
Calibration Button until the countdown ‘10-0 Abort Calibration’
completes. After which the display shows Cal. Complete then
returns to 00 %LEL.
Sensor Life Check
Units, calibrated for methane only, indicate life expectancy of the
sensor. Once calibration is complete, one of the following messages
may display if the sensor needs replacing.
Sensor Near End of Life - indicates the sensor will reach end
of life before the next calibration can be completed. Replace
sensor as soon as possible. Press the Calibration Button or use the
Reed Switch to clear this message.
End of Sensor Life, Replace Sensor - indicates sensor has
reached end of life and needs to be replaced immediately.
Press the Calibration Button or use the Reed Switch to clear this
message. The unit will remain in Fault Mode until the sensor is
replaced.
Calibration Failure
If the calibration procedure fails, the display shows Fail Cal, the
Status LED alternates Red/Green flashes and the analog output
changes back and forth from 3.0 to 3.3 mA.
The unit remains in a failed state until a Manual Reset. After the
Manual Reset, the unit will return to normal operation based on
previous calibration values.
SECTION 6: Monitor
Review Relay Settings
This is a read-only mode; changes cannot be made.
1. Press and hold the Calibration Button or hold the magnet to
the Reed Switch to enter the Main Menu; wait for the
countdown, from 10 to 0, to end.
2. When Review Relay Settings displays press the Calibration
Button or use the Reed Switch to select. The flashing YES
confirms the selection.
3. The Fault Alarm is fixed (Energized /Non-Latching) and
displays first, then the Low Alarm level, coil and latch status
display, followed by the High Alarm level, coil and latch
status.
4. At this point, the option to Set Relay Options YES? is
displayed.
Set Relay Option
Use to set the alarm level, coil status and latch status for the Low and
High Alarm relays (Fault Alarm is fixed).The following table
describes the default settings for the relays.
Note: The High and Low relay configurations are set up independent
of each other.

NetSafetyMonitoringInc.
20
MAN-0047 Rev 12 MLP-A/AR/AD-SC1100 & MLP- LP-A/AR/ARS-SC1100
Steps in setting relay options
There are two settings for Relay Options: Low and High. The Fault
Relay is fixed as Energized/Non-latching and cannot be changed.
The low alarm level, coil energization and latch status are set first;
high alarm level, coil energization and latch status are then set. All
ranges are in %LEL. Low and High alarm levels will be displayed if
reached.
1. When Set Relay Options YES? displays press the
Calibration Button or use the Reed Switch to select.
The flashing YES confirms the selection. The message Set
Low displays. Low Alarm set-points are then displayed in
increments of 5 (0 to 55).
2. When the required level displays, press the Calibration
Button or use the Reed Switch to select. The level selected
will flash to confirm the selection.
3. The message Coil Status displays. The display then shows
Energized YES? and then De-Energized YES?.
4. Press the Calibration Button or use the Reed Switch to
select. The flashing YES confirms the selection. If no
selection is made, Coil Status option is repeated.
5. The message Latch Status displays. The display then shows
Latching YES? and then Non-Latching YES?.
6. Press the Calibration Button or use the Reed Switch to
select. The flashing YES confirms the selection. If no
selection is made, Latch Status option is repeated.
7. The message Set High displays.
The High Alarm level cannot be set to a value lower than the
Low Alarm level (as set in Step 2), nor higher than the
maximum of 55% LEL. The High Alarm level is displayed
in increments of 5 greater than the Low Alarm level (as set
in Step 2).
8. Repeat Steps 3 through 6 to complete the High Alarm level,
coil and latch status settings.
Note: If no selection is made, a 5 minute timer expires, in which
case the unit returns to normal operation.
Enter Restricted Menu
The Restricted Menu allows you to select:
•Sensor Separation Distance (“Extend Sensor Separation”).
•Low Power Options (optional).
1. Press and hold the Calibration Button or hold the magnet to
the Reed Switch to enter the Main Menu; wait for the
countdown, from 10 to 0, to end.
2. When Enter restricted menu YES? displays press the
Calibration Button or use the Reed Switch to select.
The flashing YES confirms the selection.
3. When Are you sure? YES? displays, press the Calibration
Button or use the Reed Switch to select.
The flashing YES confirms the selection.
Millennium
model # Alarm levels Coil Status
Low
*
High
*
Fault
Latching Non-latching Energized De-energized
MLP-
A/AR/AD-
SC1100
and MLP-
LP-
A/AR/ARS-
SC1100
20% 40% Fixed as
Energized
and Non-
latching
* *
Table 5: Default Relay Settings