Reference Manual
00809-0100-4034, Rev AA
April 2019
Millennium II Basic Transmitter
Important Instructions
Net Safety Monitoring, Inc (Net Safety) designs, manufactures and tests products to function within
specific conditions. Because these products are sophisticated technical instruments, it is important
that the owner and operation personnel must strictly adhere both to the information printed on the
product nameplate and to all instructions provided in this manual prior to installation, operation, and
maintenance.
Installing, operating or maintaining a Net Safety Product improperly could lead to serious injury or
death from explosion or exposure to dangerous substances. Comply with all information on the
product, in this manual, and in any local and national codes that apply to the product. Do not allow
untrained personnel to work with this product. Use Net Safety parts and work procedures specified in
this manual.
Notice
The contents of this publication are presented for informational purposes only, and while every effort
has been made to ensure their accuracy, they are not to be construed as warranties or guarantees,
expressed or implied, regarding the products or services described herein or their use or applicability.
All sales are governed by Net Safety’s terms and conditions, which are available upon request. We
reserve the right to modify or improve the designs or specifications of such products at any time.
Net Safety does not assume responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use and maintenance of any Net Safety products remains solely with
the purchaser and end-user.
To the best of Net Safety’s knowledge, the information herein is complete and accurate. Net Safety
makes no warranties, expressed or implied, including implied warranties of merchantability and fitness
for a particular purpose with respect to this manual and, in no event, shall Net Safety be liable for any
incidental, punitive, special or consequential damages including, but not limited to, loss of production,
loss of profits, loss of revenue or use and costs incurred including without limitation for capital, fuel and
power, and claims of third parties.
Product names used herein are for manufacturer or supplier identification only and may be
trademarks/registered trademarks of these companies.
Net Safety and the Net Safety logo are registered trademarks of Net Safety Monitoring, Inc. The
Emerson logo is a trademark and service mark of the Emerson Electric Company.
Copyright © 2019 by Rosemount, Shakopee, MN.
All rights reserved. No part of this work may be reproduced or copied in any form or by any means - graphic,
electronic, or mechanical without first receiving written permission of Rosemount, Shakopee, MN.
Warranty
1. Limited Warranty. Subject to the limitations contained in Section 10 (Limitation of Remedy
and Liability) herein, Seller warrants that (a) the licensed firmware embodied in the Goods will
execute the programming instructions provided by Seller; (b) that the Goods manufactured by
Seller will be free from defects in materials or workmanship under normal use and care; and (c)
Services will be performed by trained personnel using proper equipment and instrumentation
for the particular Service provided. The foregoing warranties will apply until the expiration of
the applicable warranty period. Sensors and detectors are warranted against defective parts
and workmanship for 24 months from the date of purchase and other electronic assemblies for
36 months from the date of purchase. Products purchased by Seller from a third party for
resale to Buyer (Resale Products) shall carry only the warranty extended by the original
manufacturer. Buyer agrees that Seller has no liability for Resale Products beyond making a
reasonable commercial effort to arrange for procurement and shipping of the Resale Products.
If Buyer discovers any warranty defects and notifies Seller thereof in writing during the
applicable warranty period, Seller shall, at its option, (i) correct any errors that are found by
Seller in the firmware or Services; (ii) repair or replace FOB point of manufacture that portion of
the Goods found by Seller to be defective; or (iii) refund the purchase price of the defective
portion of the Goods/Services. All replacements or repairs necessitated by inadequate
maintenance; normal wear and usage; unsuitable power sources or environmental conditions;
accident; misuse; improper installation; modification; repair; use of unauthorized replacement
parts; storage or handling; or any other cause not the fault of Seller, are not covered by this
limited warranty and shall be replaced or repaired at Buyer’s sole expense and Seller shall not
be obligated to pay any costs or charges incurred by Buyer or any other party except as may be
agreed upon in writing in advance by Seller. All costs of dismantling, reinstallation, freight and
the time and expenses of Seller’s personnel and representatives for site travel and diagnosis
under this limited warranty clause shall be borne by Buyer unless accepted in writing by Seller.
Goods repaired and parts replaced by Seller during the warranty period shall be in warranty for
the remainder of the original warranty period or 90 days, whichever is longer. This limited
warranty is the only warranty made by Seller and can be amended only in a writing signed by an
authorized representative of Seller. The limited warranty herein ceases to be effective if Buyer
fails to operate and use the Goods sold hereunder in a safe and reasonable manner and in
accordance with any written instructions from the manufacturers. THE WARRANTIES AND
REMEDIES SET FORTH ABOVE ARE EXCLUSIVE. THERE ARE NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY, FITNESS FOR
PARTICULAR PURPOSE OR ANY OTHER MATTER WITH RESPECT TO ANY OF THE GOODS OR
SERVICES.
2. Limitation of Remedy and Liability. SELLER SHALL NOT BE LIABLE FOR DAMAGES CAUSED BY
DELAY IN PERFORMANCE. THE REMEDIES OF BUYER SET FORTH IN THE AGREEMENT ARE
EXCLUSIVE. IN NO EVENT, REGARDLESS OF THE FORM OF THE CLAIM OR CAUSE OF ACTION
(WHETHER BASED IN CONTRACT, INFRINGEMENT, NEGLIGENCE, STRICT LIABILITY, OTHER
TORT OR OTHERWISE), SHALL SELLER’S LIABILITY TO BUYER AND/OR BUYER’S CUSTOMERS
EXCEED THE PRICE TO BUYER OF THE SPECIFIC GOODS MANUFACTURED OR SERVICES
PROVIDED BY SELLER GIVING RISE TO THE CLAIM OR CAUSE OF ACTION. BUYER AGREES THAT
IN NO EVENT SHALL SELLER’S LIABILITY TO BUYER AND/OR BUYER’S CUSTOMERS EXTEND TO
INCLUDE INCIDENTAL, CONSEQUENTIAL OR PUNITIVE DAMAGES. THE TERM
“CONSEQUENTIAL DAMAGES” SHALL INCLUDE, BUT NOT BE LIMITED TO, LOSS OF
ANTICIPATED PROFITS, REVENUE OR USE AND COSTS INCURRED INCLUDING WITHOUT
LIMITATION FOR CAPITAL, FUEL AND POWER, AND CLAIMS OF BUYER’S CUSTOMERS.
Reference Manual Table of Contents
00809-0100-4034, Rev AA April 2019
Table of Contents i
Contents
Section 1: Introduction ...................................................................... 1
1.1 Models covered ................................................................................................................... 1
1.2 Service support ................................................................................................................... 1
1.3 Return of material ............................................................................................................... 1
1.4 Product recycling/disposal .................................................................................................. 1
Section 2: Installation ........................................................................ 2
2.1 Unpacking and inspection ................................................................................................... 2
2.2 Dimensions ......................................................................................................................... 2
2.3 Mounting ............................................................................................................................ 2
2.4 Wiring ................................................................................................................................. 3
2.4.1 General requirements ........................................................................................... 3
2.4.2 Terminal connection ............................................................................................. 3
2.4.3 Cable choice and guidelines .................................................................................. 4
2.4.4 Important wiring guidelines .................................................................................. 4
2.4.5 External ground .................................................................................................... 5
2.4.6 Seals ..................................................................................................................... 5
2.4.7 Analog output, isolated supply, non-isolated supply and jumper configuration ..... 5
2.5 Wiring drawings .................................................................................................................. 7
2.6 Remote mounting of sensor ................................................................................................ 8
2.6.1 Wiring drawings for remote sensor wiring ............................................................. 9
2.7 Installation checklist .......................................................................................................... 10
Section 3: Operation ........................................................................ 11
3.1 Transmitter and faceplate description ............................................................................... 11
3.2 Intrusive access ................................................................................................................. 11
3.3 Non-intrusive access (magnetic Reed switch Access) ......................................................... 11
Section 4: Output configurations ..................................................... 13
4.1 Analog board assembly ..................................................................................................... 13
4.2 Analog/HART board assembly ........................................................................................... 14
4.3 Relay board assembly/configuration ................................................................................. 15
4.4 Digital board assembly/configuration................................................................................ 16
Section 5: Operation ........................................................................ 17
5.1 DIP switch settings ............................................................................................................ 17
5.1.1 Infrared sensor (SC311) gas curve selection ........................................................ 17
5.1.2 Hydrogen sulfide sensor (ST320) range selection ................................................ 17
5.1.3 Carbon monoxide sensor (ST360) range selection ............................................... 18
5.1.4 DIP switch settings for relay configuration .......................................................... 18
5.1.5 Digital Modbus DIP switch settings ..................................................................... 19
5.1.6 Analog and analog/HART DIP switch settings ...................................................... 20
Section 6: Calibration procedure ...................................................... 21
6.1 Calibration procedure ....................................................................................................... 21
6.1.1 Guidelines........................................................................................................... 21
6.1.2 Full calibration procedure ................................................................................... 21
6.2 Zeroing procedure ............................................................................................................ 22
6.3 Status conditions during calibration .................................................................................. 24
6.4 Calibration failures ............................................................................................................ 24
6.5 Manual reset ..................................................................................................................... 24
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April 2019 00809-0100-4034, Rev AA
ii Table of Contents
Section 7: Monitoring and outputs .................................................. 25
7.1 Analog 4-20mA ................................................................................................................. 25
7.2 HART Communication (Optional) ...................................................................................... 25
7.2.1 HART Menu Structure ......................................................................................... 25
7.3 Relays (Optional) ............................................................................................................... 28
7.3.1 Alarm relays ........................................................................................................ 28
7.3.2 Fault relay ........................................................................................................... 28
7.4 RS-485 Modbus RTU (Optional) ......................................................................................... 28
7.4.1 Modbus registers ................................................................................................ 29
7.5 Transmitter output operation............................................................................................ 30
7.6 Fault monitoring ............................................................................................................... 31
7.7 Fault conditions ................................................................................................................ 31
7.7.1 Transmitter fault conditions ................................................................................ 31
7.7.2 Sensor fault conditions ....................................................................................... 32
Section 8: Maintenance ................................................................... 33
8.1 Periodic response check .................................................................................................... 33
8.2 Troubleshooting ............................................................................................................... 33
8.3 Storage ............................................................................................................................. 33
8.4 Spare parts and accessories ............................................................................................... 34
Section 9: Electrostatic sensitive device ........................................... 35
Section 10: Wire resistance table ....................................................... 36
Section 11: Specifications .................................................................. 37
11.1 Electrical ........................................................................................................................... 37
11.1.1 Operating voltage range ..................................................................................... 37
11.1.2 Power consumption ............................................................................................ 37
11.1.3 EMC compliance ................................................................................................. 37
11.2 Environmental................................................................................................................... 37
11.2.1 Operating temperature ...................................................................................... 37
11.2.2 Relative humidity ................................................................................................ 37
11.2.3 Ingress protection ............................................................................................... 37
11.3 Mechanical ........................................................................................................................ 38
11.3.1 Enclosure material .............................................................................................. 38
11.3.2 Conduit opening ................................................................................................. 38
11.3.3 Weight ............................................................................................................... 38
11.4 Warranty ........................................................................................................................... 38
Section 12: Certifications ................................................................... 39
12.1 North American................................................................................................................. 39
12.2 IECEx ................................................................................................................................. 39
12.3 FC Models ......................................................................................................................... 39
12.3.1 North America .................................................................................................... 39
12.3.2 IECEx .................................................................................................................. 39
Section 13: Ordering information ...................................................... 40
Reference Manual Introduction
00809-0100-4034, Rev AA April 2019
Introduction 1
Section 1: Introduction
1.1 Models covered
A Millennium II Basic gas detection system is composed of a field mounted transmitter and Millennium
II series sensors, which may be integrally mounted to the transmitter or remotely mounted.
The transmitter is certified for use in hazardous locations and is available as a single sensor system.
Some operator controls, including calibration, can be accessed without opening the enclosure
(housing) by using other communication devices and the attached magnet to actuate the reed switch.
Available outputs are: conventional 4 to 20 mA analog, analog/HART®, electromechanical relays, or
Modbus® RTU digital.
1.2 Service support
Technical support for this product can be provided by contacting your local Emerson representative or
by contacting the Technical Support department at +1 866 347 3427 (toll free) or
Safety.CSC@Emerson.com.
1.3 Return of material
To expedite the return of this product, proper communication between the customer and the factory is
important. Before returning a product, call +1 866 347 3427 (toll free) or e-mail
Safety.CSC@Emerson.com for a Return Material Authorization (RMA) number.
On the return of the equipment, include the following information:
1. RMA number provided to you by Rosemount
2. Company name and contact information
3. Ship all equipment, prepaid to:
Rosemount
6021 Innovation Boulevard
Shakopee, MN 55379
4. Mark all packages with the RMA number and type of return (e.g. return for evaluation)
Pack items to protect them from damage and use anti-static bags or aluminum-backed cardboard as
protection from electrostatic damage.
All equipment must be shipped prepaid. Collect shipments will not be accepted.
1.4 Product recycling/disposal
Recycling of equipment and packaging should be taken into consideration and disposed of in
accordance with local and national legislations/regulations.
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2 Installation
Section 2: Installation
2.1 Unpacking and inspection
Carefully remove all of the components from the packaging and verify them against the enclosed
packing list. Inspect all components for any obvious damage such as broken or loose parts. If you find
any components missing or damaged, notify your local Net Safety representative or the factory
immediately.
2.2 Dimensions
The Millennium II Basic transmitter enclosure is available in aluminum (6061) and stainless steel
(SS316). Dimensions are provided in Figure 2-1 below.
Figure 2-1: Dimensions
A B C D E F G
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
Transmitter (AL)
4.8
122
3.6
91
3.6
91
4.8
122
5.1
130
0.3
7.6
3.0
76
Transmitter (SS)
4.7
119
3.6
91
3.6
91
4.7
119
5.1
130
0.3
7.6
3.2
81
2.3 Mounting
Ensure transmitter and sensor are securely mounted as per local regulations. The transmitter has
mounting holes to allow mounting to a wall or pole as desired. Mounting kit hardware is required when
mounting the transmitter a pole. Contact your local Net Safety representative for detailed information
on the pole mounting kits. The transmitter should be mounted at eye-level and be easily accessible for
monitoring and maintenance purposes.
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00809-0100-4034, Rev AA April 2019
Installation 3
2.4 Wiring
2.4.1 General requirements
Failure to follow these installation guidelines could result in death or serious injury. Ensure that only
qualified personnel perform the installation.
Electrical shock could cause death or serious injury. Use extreme caution when making contact with
the leads and terminals.
Do not open the transmitter, sensor, or junction box enclosure when in a classified area or when an
explosive atmosphere may be present unless the power to the transmitter has been removed.
Wiring codes and regulations may vary. Wiring must comply with all 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.
When separating the sensor from the transmitter, the use of shielded cable is highly recommended to
meet electromagnetic compatibility (EMC) requirements and to protect against interference caused by
extraneous electrical or electromagnetic noise. In applications where the wiring is installed in conduit,
the conduit must not be used for wiring to other equipment.
If the 4-20 mA signal is not used, connect a jumper between the 4 – 20 mA terminal and the common
terminal to allow analog current levels to be monitored at the test jacks on the transmitter board.
In applications where wiring is installed in conduit, conduit must not be used for wiring to any other
electrical equipment.
For effective communication, Net Safety limits sensor separation to 2000 feet (600 meters) using 16
AWG wires.
Modbus RS-485 connection 2-wire mode, multipoint serial line available. Up to 16 addresses allowed.
When developing a RS-485 chain of devices, the last device in the chain requires an end of line
termination resistor (120 Ohms).
2.4.2 Terminal connection
When connecting cable wires, use a small screwdriver to gently press down and hold the spring
connector open. Insert the appropriate wire into the open connector hole, releasing the screwdriver to
secure the wire as shown in Figure 2-2.
The connector will accommodate wire sizes between 14 and 20 AWG.
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4 Installation
Figure 2-2 Terminal connection
2.4.3 Cable choice and guidelines
Radio frequency interference (RFI) can be caused by nearby electrical devices (e.g. transformers or high
voltage equipment) as well as handheld communication devices/radios, which when activated, may
impede the proper functioning of the transmitter and sensor. Selecting the right instrumentation cable
and making proper grounding connections within the junction box will reduce or eliminate
interference. Visible symptoms of RFI include inconsistent, incorrect, and erratic LEL and ppm readings.
2.4.4 Important wiring guidelines
Gas detection instruments are an important part of a safety alarm and shutdown system. The system is
composed of:
• Detection instruments
• Customer connected equipment
• Wiring
Net Safety designs and manufactures its detection equipment under rigid quality control management
systems and makes every effort to design for the harshest of industrial environments. The other
components of the system – the customer-connected equipment and wiring – are also important
contributors to the overall quality and performance of the safety system.
It is important to implement wiring that ensures the reliability and integrity of the safety system. Field
wiring practices and the choice of cable type specified vary from project to project. Poor practices and
choices are often found to be the source of unwanted system disruptions. RFI and electromagnetic
interference (EMI) are usually very powerful disruptive forces in industrial facilities and these forces act
upon the system through the wiring.
The cable used should be a very high quality instrument grade, certified for the application conditions,
consisting of a rugged protective outer jacket, an overall electrical shield of fine braided copper or
metallic foil, and internal pairs or triads of foil shielded copper wire of suitable gauge for the power
conducted over the specified length.
The shields must be electrically continuous from the instrument junction box through other junction
boxes and finally to the connected equipment. The shield must be connected to a suitable ground sink
as specified in the instrument manual in order to protect the system from electrical disturbances.
In general, communication cables and power cables should not run in parallel for any significant length,
and should not be carried in the same cable tray. Through inductance, high currents in power cables
can induce significant ‘noise’ in communication cables running parallel alongside power cables.
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Installation 5
2.4.5 External ground
In order to ensure proper operation of the sensor, an external earth ground is recommended. Net
Safety recommends that the external ground be connected to the grounding point on the enclosure.
2.4.6 Seals
The use of seals is recommended to further protect the system against 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.
• Waterproof and explosionproof 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 than18 in.(46 cm) away.
• Explosionproof 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 fiber 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 particles and water leakage through the inside of the shield
and into the enclosure.
• It is recommended that explosionproof drains and conduit breathers be used. In some applications,
changes in temperature and barometric pressure can cause breathing which allows moist air to
enter and circulate inside the conduit. Joints in the conduit system are seldom tight enough to
prevent this breathing.
2.4.7 Analog output, isolated supply, non-isolated supply and jumper
configuration
The analog output may be powered from the main instrument power supply or a separate,
independent power supply, in which case an isolated wiring configuration is necessary. These
configurations only apply to analog and analog/HART® model transmitters.
To set a non-isolated or isolated current output, simply move the jumper/shorting jack located at JP1
near the power and output terminals, to either the non-isolated or isolated current position. For nonisolated current output, ensure pins 3 and 2 at JP1 location on the terminal board are jumpered
(shorted). See Figure 2-3 for reference. Factory standard models ship with jumper in the non -isolated
current output position.
For isolated current output, pins 1 and 2 at JP1 should be jumpered (shorted). See Figure 2-3 for
reference.
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6 Installation
Figure 2-3 Non-isolated and isolated current jumpers
Always ensure that JP1 jumpers are in the correct position depending on the current output
configuration chosen.
Non-isolated current output configuration (default).
Pin 3 and Pin 2 jumpered at JP1
Isolated current output configuration.
Pin 1 and Pin 2 jumpered at JP1
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Installation 7
2.5 Wiring drawings
The drawings below are general ways in wiring the system showing analog signal output. Consult
qualified personnel on specific wiring requirements.
Figure 2-4 Non-isolated terminal connection (for Analog and Analog/HART models)
Figure 2-5 Isolated terminal connection (for Analog and Analog/HART models)
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8 Installation
2.6 Remote mounting of sensor
When necessary to mount sensor remotely (separated from transmitter) by way of junction box and
conduit, it is important that the installer follow the necessary requirements and guidelines relating to
sensor separation and cable selection. See Figure 2-6 for typical remote mounting of the sensor.
When sensors are being mounted remotely, consult the multi-purpose junction box manual
(MAN-0081) for wiring instructions. Always ensure that the transmitter is supplying 10.5 - 32 VDC
across the sensor power terminals of Net Safety junction box (JB-MPD-A/S).
The maximum distance between the sensor and transmitter is limited by the resistance of the
connecting wiring, which is a function of the gauge of the wire being used. For effective
communication, Net Safety limits the separation distance between sensor and transmitter to 2000 feet
(600 meters) using 16 AWG wire. See Section 10: for information on wire gauge and resistance.
Figure 2-6 Remote mounting of sensor
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Installation 9
2.6.1 Wiring drawings for remote sensor wiring
The drawings below are an analog output drawing showing wiring of sensor to transmitter remotely via
a junction box. Consult qualified personnel on specific wiring requirements.
Figure 2-7 Non-isolated terminal wiring with remote sensor wiring (for Analog and Analog/HART models)
Figure 2-8 Isolated terminal wiring with remote sensor wiring (for Analog and Analog/HART models)
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10 Installation
2.7 Installation checklist
Review the following checklist prior to turning the power on to the transmitter after installation has
been completed:
□ Ensure that the transmitter and sensor are properly and firmly mounted.
□ Ensure that stopping plugs are securely tightened on any unused conduit entries.
□ Ensure that the transmitter and sensor are not obstructed; transmitter and sensor are accessible
and target gas is not inhibited from reaching the sensor.
□ Ensure adherence to applicable local guidelines and requirements on wiring and sealing of
equipment in hazardous and non-hazardous areas.
□ Ensure that proper shielding and grounding practices are adhered to and local codes are being
followed.
□ Check system operational voltage and conditions; ensuring that they are within the applicable
specifications of the transmitter and sensor.
□ Verify wiring at all termination and junction points (transmitter, junction box, and power supply).
□ Ensure that the transmitter housing cover and sensor cap are secured tightly.
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Operation 11
Section 3: Operation
3.1 Transmitter and faceplate description
After wiring is completed and power is applied, indicated by the green power LED, a warm-up routine
will begin, during which the sensor is automatically tested to ensure proper operation. The Status LED
will slowly flash red and the current output will be 3.0 mA (indicated by Analog models). Once the
warm-up routine has been completed, the LED will flash green, indicating normal operation. The time
taken for the transmitter to complete its warm-up cycle is dependent on the type of sensor being used.
Figure 3-1 Faceplate description
The transmitter faceplate shows the position of the magnetic switch, the status LED, and the status LED
states. See 0 for more information on the Status LED.
3.2 Intrusive access
Do not open the transmitter, sensor, or junction box enclosure when in a classified area or when an
explosive atmosphere may be present unless the power to the transmitter has been removed.
This involves the removal of the top cover and faceplate to access the pushbutton switch when
calibrating and resetting the transmitter. Pressing and holding the pushbutton down for up to three (3)
seconds resets the transmitter; latched alarms are cleared and sensor performed self-tests. Holding
down the pushbutton for up to fifteen (15) seconds sends the transmitter into full calibration mode.
See 6.3 for more information on calibration and manual reset.
3.3 Non-intrusive access (magnetic reed switch access)
This involves placing and holding the attached magnet next to the base of the label mount as indicated
in Figure 3-2. When the magnet is held for up to three (3) seconds, a manual reset will be initiated. If
Operation Reference Manual
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12 Operation
the magnet is held for up to fifteen (15) seconds a full calibration procedure will begin. See Section 6:
for more information on calibration and manual reset.
Figure 3-2 Positioning of magnet
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Output configurations 13
Section 4: Output configurations
4.1 Analog board assembly
The Analog model Millennium II Basic Transmitter provides a 4-20 mA signal output, allowing the
user/operator with a signal representing various conditions and states of the transmitter. See the
following table for current output and meaning.
Sensor Terminals
Sensor Wire
White
Red
Blue
Black
Green
Marked
+VDC
Sig A
Sig B
COM
Function
10.5 - 32 VDC
A B Comm
Earth Ground
Output Terminals
Marked
+VDC
COM
4 – 20
ISO
Function
Power (+)
(10.5-32 VDC)
Power (-)
Current loop output
Isolate the power for
current loop
Figure 4-1 Analog circuit board assembly
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14 Output configurations
4.2 Analog/HART
®
board assembly
The analog/HART Millennium II Basic Transmitter provides the user/operator with the option of using a
HART Communicator to gain access to the transmitter settings and output. This allows reviewing,
logging, and monitoring of data which is ideally suited for maintenance. See Section 7.2 for more
information.
Sensor Terminals
Sensor Wire
White
Red
Blue
Black
Green
Marked
+Vdc
Sig A
Sig B
COM
Function
10.5 - 32Vdc
A B Comm
Earth Ground
Output Terminals
Marked
+VDC
COM
4 – 20
ISO
Function
Power (+)
(10.5-32 VDC)
Power (-)
Current loop output
Isolate the power for
current loop
Figure 4-2 Analog/HART circuit board assembly
For Hart Communicator connection in isolated or non-isolated configuration, the total loop resistance
must be a minimum of 250 Ohms to a maximum of 600 Ohms. Do not install resistor within the
Millennium II Basic Transmitter.
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Output configurations 15
4.3 Relay board assembly/configuration
This assembly has three (3) relays; a fault alarm relay, a low alarm relay and a high alarm relay. The fault
alarm relay is fixed as energized and non-latching and cannot be changed. The low alarm relay and the
high alarm relay may be configured as energized or de-energized and latching or non-latching. By
default the low and high alarm relay contacts are de-energized and non-latching. For more information
on adjusting the relay settings refer to 7.3.
Sensor Terminals
Sensor Wire
White
Red
Blue
Black
Green
Marked
+VDC
Sig A
Sig B
COM
Function
10.5 - 32 VDC
A B Comm
Earth Ground
Output
Terminals
Marked
RST
+VDC
COM
FNO
FCOM
FNC
A1NO
A1COM
A1NC
A2NO
A2COM
A2NC
Function
Remote
Reset
Power
(+)
(10.5-32
VDC)
Power
(-)
Fault
Alarm 1
(Low Alarm)
Alarm 2
(High Alarm)
Relay definitions:
Fault Alarm contacts: Fault Normally Open (FNO), Fault Common (FCOM), and Fault Normally Closed
(FNC).
Low Alarm contacts: Alarm 1 Normally Open (A1NO), Alarm 1 Common (A1COM) and Alarm 1
Normally Closed (A1NC).
High Alarm contacts: Alarm 2 Normally Open (A2NO), Alarm 2 Common (A2COM) and Alarm 2
Normally Closed (A2NC).
Figure 4-3 Relay circuit board assembly
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16 Output configurations
4.4 Digital board assembly/configuration
This assembly allows digital output utilizing Modbus® Digital RS-485 protocols. See 7.4 for more
information.
Sensor Terminals
Sensor Wire
White
Red
Blue
Black
Green
Marked
+VDC
Sig A
Sig B
COM
Function
10.5 - 32 VDC
A B Common
Earth Ground
Output
Terminals
Marked
+VDC
COM
A(positive )
B(negative)
COM
Shld
Function
Power (+)
(10.5-32 VDC)
Power (-)
Modbus RTU
Terminal A
Modbus RTU
Terminal B
Modbus RTU
Terminal
Common
Shield
Figure 4-4 Digital circuit board assembly
Reference Manual Operation
00809-0100-4034, Rev AA April 2019
Operation 17
Section 5: Operation
5.1 DIP switch settings
5.1.1 Infrared sensor (SC311) gas curve selection
When using the SC311 sensor with the Millennium II Basic transmitter, DIP switch 2 on the transmitter
should be set up as follows:
The gas curve or range should only be changed when the sensor and transmitter are in normal state.
After powering up, the transmitter, the status LED will slowly flash green to indicate normal operating
state. The system should be recalibrated with 50 percent of the specific target gas if the sensor’s range
is changed.
Position 1
Position 2
Position 3
Position 4
Gas Curve
OFF
OFF
OFF
OFF
Methane (0)
ON
OFF
OFF
OFF
Propane (1)*
OFF
ON
OFF
OFF
n-Butane (2)*
ON
ON
OFF
OFF
Iso-Pentane (3)*
OFF
OFF
ON
OFF
n-Pentane (4)*
ON
OFF
ON
OFF
Ethane (5)
OFF
ON
ON
OFF
Iso-Butane (6)*
ON
ON
ON
OFF
Ethylene (7)
OFF
OFF
OFF
ON
Hexane (8)*
ON
OFF
OFF
ON
Propylene (9)*
*Indicates gases are not third party performance verified
5.1.2 Hydrogen sulfide sensor (ST320) range selection
Position 1
Position 2
Position 3
Position 4
Range(Setting)
ON
OFF
OFF
OFF
Range 1 (20ppm)
OFF
ON
OFF
OFF
Range 2 (50ppm)
OFF
OFF
ON
OFF
Range 3 (100ppm)
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April 2019 00809-0100-4034, Rev AA
18 Operation
5.1.3 Carbon monoxide sensor (ST360) range selection
Position 1
Position 2
Position 3
Position 4
Range(Setting)
ON
OFF
OFF
OFF
Range 1 (500ppm)
OFF
ON
OFF
OFF
Range 2 (1000ppm)
5.1.4 DIP switch settings for relay configuration
DIP switch 1 and DIP switch 3, as seen in the tables below, show the settings for relay alarm levels and
status. DIP switch 3 position 4, is used in conjunction with DIP switch 1, if needed to set up the alarm
level. The user is allowed to fully utilize, if necessary, all the percentages offered. To arrive at the desired
low alarm level, add different percentages, while taking note of the sensor’s range/scale. The high
alarm level (A2) is automatically set to twice the low alarm level (A1).
Example: For a sensor with range/scale of 50 ppm, and DIP switch 1 set with positions 2 and 4 ‘On’ (8
percent +2 percent) the low level alarm point would be (10 percent of 50 ppm) which is 5 ppm
automatically making the high level alarm point 10 ppm.
DIP Switch 1 Settings
Position
Status
Value
Function
Position 1
On
16%
DIP Switch 1 positions are used in conjunction with DIP
Switch 3, *position 4*, if needs be, to set the Alarm
point (% of full scale or range)
Off
0%
Position 2
On
8%
Off
0%
Position 3
On
4%
Off
0%
Position 4
On
2%
Off
0%
Reference Manual Operation
00809-0100-4034, Rev AA April 2019
Operation 19
DIP Switch 3 Settings
Position
Status
Value
Function
Position 1
ON
RFU
Not used now
OFF
RFU
Position 2
ON
Energized
Defines Relay Coil Status
OFF(default)
De-energized
Position 3
ON
Latching
Defines Relay Latch Status
OFF(default)
Non-Latching
Position 4
ON
32%
*Used with DIP Switch 1 to set the Alarm Point, (% of full
scale/range) if needs be*.
OFF
0%
5.1.5 Digital Modbus
®
DIP switch settings
DIP switch 1 selects the Modbus address. DIP switch 2 defines the Modbus settings. Positions 1 and 2 of
DIP switch 2 select the baud rate of the Modbus system. Positions 3 and 4 of DIP switch 2 select the
data format of the Modbus data link. These DIP switches must be set before the Millennium II Basic is
powered up. Once the device is powered up the setting will be locked until another power down and up
cycle. Refer to the following tables for DIP switch positions.
DIP Switch 1
Position 1
Position 2
Position 3
Position 4
MODBUS Address
OFF
OFF
OFF
OFF
16
ON
OFF
OFF
OFF
15
OFF
ON
OFF
OFF
14
ON
ON
OFF
OFF
13
OFF
OFF
ON
OFF
12
ON
OFF
ON
OFF
11
OFF
ON
ON
OFF
10
ON
ON
ON
OFF 9 OFF
OFF
OFF
ON 8 ON
OFF
OFF
ON
7
OFF
ON
OFF
ON
6
ON
ON
OFF
ON 5 OFF
OFF
ON
ON 4 ON
OFF
ON
ON
3
OFF
ON
ON
ON
2
ON
ON
ON
ON
1
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April 2019 00809-0100-4034, Rev AA
20 Operation
DIP Switch 2 settings for baud rate
Position 1
Position 2
BAUD Rate
OFF
OFF
19200
OFF
ON
9600
ON
OFF
4800
ON
ON
2400
DIP Switch 2 for format bits
Position 3
Position 4
Date Format
OFF
OFF
8 bits data, no parity bit, 2 stop bits (also compatible to 1 stop bit)
OFF
ON
8 bits data, no parity bit, 2 stop bits
ON
OFF
8 bits data, odd parity bit, 1 stop bits
ON
ON
8 bits data, even parity bit, 1 stop bits
5.1.6 Analog and analog/HART
®
DIP switch settings
DIP switch 1 is not utilized when using the Millennium II Basic analog and analog/HART models. DIP
switch 2 settings/positions, are utilized for different gas curves when using IR sensors (SC311) and for
changing toxic sensor ranges (ST3XX). Refer to specific sensor manuals to see the combinations of DIP
switch 2 positions and when it is utilized.
Reference Manual Calibration procedure
00809-0100-4034, Rev AA April 2019
Calibration procedure 21
Section 6: Calibration procedure
6.1 Calibration procedure
Prior to attempting calibration read and understand the calibration procedure below. Also see
Figure 6-1 for additional reference.
The following calibration procedure should be followed to ensure an accurate correlation between the
output signals and the gas concentration. For accurate performance, the Millennium II Basic
Transmitter is calibrated using 50 percent span gas.
6.1.1 Guidelines
Calibration is recommended after the Millennium II Basic and sensor are installed. Calibration should be
performed after the sensor has been powered for at least 24 hours. Refer to specific sensor manuals for
details on calibrating.
All systems should be bypassed during calibration and bump testing to avoid unwanted alarms.
6.1.2 Full calibration procedure
1. Confirm successful power-up of transmitter, (green or red flashing of status LED).
2. For analog model connect a standard ammeter to the transmitter Test Jacks (not required but
gives visual confirmation). See figures in for Test Jacks location.
3. Press and hold the pushbutton, or activate the Reed switch using the magnet, for at least fifteen
(15) seconds; the status LED flashes green fast, and then goes solid green (first solid green), keep
holding the pushbutton or magnet, after which, the status LED goes solid red. Release the
pushbutton or remove magnet.
4. When the current output is 3 mA (indicated by analog models) and the status LED is once again
solid green (second solid green). Apply zero gas (clean air). Recommendation: Flow clean air at a
rate of 0.5 liter per minute or more to the sensor for best results.
5. When the current output is 3.3 mA (indicated by analog models) and the status LED is flashing
red, apply the calibration gas (50 percent of full span) to the sensor. Recommendation: Flow span
gas at a rate of 0.5 liter per minute to the sensor for direct sensor calibration. If the sensor is
separated with long tubing runs, increase the gas flow rate to ensure tubing does not affect
calibration results.
6. When the current output is 3.6 mA (indicated by analog models) and the status LED is solid
green, remove the calibration gas.
7. Apply zero gas (clean air) again to purge the system if calibration tubing is used.
8. After the sensor is purged of gas, the transmitter will return to normal operation.
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April 2019 00809-0100-4034, Rev AA
22 Calibration procedure
6.2 Zeroing procedure
This option is useful if the sensor’s zero point has drifted as a result of a change in the ambient
conditions.
Zeroing does not require the application of a calibration gas. It does, however, require that no
contaminated gas is present in the ambient air, if the surrounding air is being used.
Zeroing is not a substitute for performing a full calibration. Zeroing can be completed on an interim
basis; however, It is highly recommended that a full calibration be completed whenever possible.
1. Confirm successful power-up of transmitter (green flashing of status LED every second: no fault
indicated).
2. For analog model connect a standard ammeter to the transmitter test jacks (not required but
gives visual confirmation).
3. Press and hold the pushbutton, or activate the Reed switch using the magnet, until the status
LED flashes green fast, and then goes solid green. Release the pushbutton or deactivate the Reed
switch.
4. When the status LED is solid green, the current output will be 3 mA (indicated by analog models).
Apply zero gas (clean air). Recommendation: Flow clean air at a rate of 0.5 liter per minute or
more to the sensor.
5. Zeroing is complete when the current output is 3.6 mA (indicated by analog models) after which,
the Status LED flashes green every second (current output of 4 mA). Remove the zero gas, or
allow the transmitter to return to normal operation if ambient (clean surrounding) air was used.
6. Normal operation is confirmed by a current output of 4 mA (indicated by analog models) and the
status LED flashing green every second.
Reference Manual Calibration procedure
00809-0100-4034, Rev AA April 2019
Calibration procedure 23
Figure 6-1 Calibration procedure
Full Calibration
Activate/hold calibration
switch for six to ten seconds
LED and analog
output
indication
Status LED solid green
3.6 mA output
Zero Calibration
Status LED flashes
fast green
Status LED goes
solid green
3.0 mA output
Apply air from canister or use
clean ambient air to perform
zero
Activate/hold calibration switch for
ten to fifteen seconds until status
LED turns red
Status LED solid
red
Status LED goes
solid green
3.0 mA output
Apply air from canister or use
clean ambient air to perform
zero
Status LED flashed
Red
3.3 mA output
Apply 50% span target gas to
perform span
Calibration Successful
Remove calibration gas and
purge calibration lines if used
Status LED alternating red
and green
3.0/3.3 mA output
Calibration Failed
Perform manual reset and
complete calibration
procedure again
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April 2019 00809-0100-4034, Rev AA
24 Calibration procedure
6.3 Status conditions during calibration
Condition
Current output
LED indication
Relay outputs
Fault
Alarm
Zero calibration initiated
4.0 mA
Fast flash green
Normal state
Normal state
Full calibration initiated
4.0 mA
Solid red
Normal state
Normal state
Zero calibration being completed
3.0 mA
Solid green
Normal state
Normal state
Apply span calibration gas
3.3 mA
Flashing red
Normal state
Normal state
Successful calibration
3.6 mA
Solid green
Normal state
Normal state
Calibration failed
3.0/3.3
Alternating red and green
Fault state
Normal state
6.4 Calibration failures
If the calibration procedure fails, the Status LED will alternate red and green with the analog output
changing back and forth from 3.0 mA to 3.3 mA. The unit will remain in a failed state until it is manually
reset.
6.5 Manual reset
A manual reset is required after a calibration failure or to clear a latched alarm. Simply press and hold
down the pushbutton for up to three (3) seconds, cycle power, or place and hold the flat surface of the
magnet near the Reed switch for up to three (3) seconds. The status LED will fast flash green, then
slowly flash red, indicating reset, after which the status LED will flash green slowly, to indicate normal
operation.
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Monitoring and outputs 25
Section 7: Monitoring and outputs
7.1 Analog 4-20mA
The Millennium II Basic transmitters (with the exception of the M2B-R) offer a variable 4-20 mA analog
output. This output will provide gas concentration through the 4-20 mA range, where 4 mA equals
zero gas concentration and 20 mA equals the high range of the sensor (e.g. 100 percent LEL or 100
ppm). Other conditions such as faults and calibration notifications (e.g. apply gas) are indicated in the
0-3.9 mA range. Faults are indicated at either 0 mA or 2.5 mA.
7.2 HART
®
communication (optional)
The HART protocol is a powerful communication technology enabling users to exploit the full
functionality of the Millennium II Basic Transmitter.
The HART Communicator may be connected to the Analog/HART model Millennium II Basic
Transmitter via the HART Port connector (HPT-001) which provides the necessary interface for
communication on the analog output wires. The HART Port connector is fitted to one of the ¾-in. NPT
conduit entries and its communication wires fitted to the HART Pins located at J3 on the Analog/HART
PCB. The HART Communicator probe wires (leads) are then connected to HART Port connector contact
points.
When remote HART Communication is being completed, ensure the HART Jumper is connected across
pins at J3. See Figure 4-2 for the location of J3. By default the jumper is connected across the pins.
When the system is powered-up, the communicator will search for the Millennium II Basic Transmitter
and when a connection is established, the communicator will show the device information. If the
Millennium II Basic Transmitter Device Description (DD) is loaded into the communicator, the
communicator can access all the information and features of the Millennium II Basic Transmitter. If the
communicator is not programmed with the specific DD, the Millennium II Basic Transmitter can still
work with the communicator as a generic device.
7.2.1 HART Menu Structure
The Hart Menu structure exists when using the HART Communicator and allows the user to see all
existing options, Device status, Calibration information and History. Refer to Figure 7-1 and Figure 7-2
for the HART menu structure and tree.
Monitoring and outputs Reference Manual
April 2019 00809-0100-4034, Rev AA
26 Monitoring and outputs
Figure 7-1 HART menu tree - page 1
This section displays a general menu tree for Millennium II series sensors. Additional menus may exist when using
communicator but should be ignored if they are not available in this menu tree.
Process
variables
Diag/Service
Basic setup
Detailed
setup
Review
Device setup.
Device status
PV Value xx % LEL/PPM
PV Current xxmA
PV LRV 0% LEL/PPM
PV URV 100% LEL/PPM
PV Value xx % LEL/PPM
PV % rnge xx%
Loop current xx mA
Test device
Calibration
Device status
History
Tag xxxx
Long Tag xxxxxxxx
PV unit % LEL/PPM
PV Xfer fnctn Linear
Range values
Device information
Sensor
Signal condition
Output condition
Device information
See next page
“Review”
Device reset
Loop test
Zero & Span
Zero only
PV Value xx % LEL/PPM
Loop current xx mA
Current gas type
Z&Span Calibration
PV mA
See next page “History”
Manufacturer Net Safety
Model Millennium II Basic
Dev ID xxxxx
Cfg Chng count xxxxx
Tag xxxxxxxxxxxx
Long Tag xxxxxxxxxxxxx
Date xx/xx/xx
Descriptor xxxxxxxxxxxxx
Message xxxxxxxxxxxx
Final asmbly num xxxxx
Revision #’s
See next page
PV LRV 0% LEL/PPM
PV URV xx % LEL/PPM
PV % rnge xx %
Xfer fnctn, linear
Analog Output
HART Output
Loop current xx mA
Loop test
Loop current mode
Poll Addr xx
Num reg preams xx
Num resp preams
PV
PV
Range value
Zero calibration
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Monitoring and outputs 27
Figure 7-2 HART menu tree - page 2
“History”
“Sensor”
“Review”
Catalytic Bead Sensor, IR
combustible, H2S toxic
PV xx % LEL
PV Unit % LEL
Sensor
Max Temperature
Min Temperature
Calibration Log
Max Temperature xxx Deg C
Max Temperature Since Reset xx Deg C
Reset Date xx/xx/xxxx
Reset Time xxxx
Reset Max Min Temperature
Min Temperature xxx Deg C
Min Temperature Since Reset xx Deg C
Reset Date xx/xx/xxxx
Reset Time xxxx
Reset Max Min Temperature
Calibration Date xx/xx/xxxx
Calibration Time xxxx
Cal Event Type xxxxxxxxx
Next Log
Previous Log
Most Recent Log
Sensor Class Cat Bead Combustible, Infrared Combustible,
H2S toxic, CO toxic
Sensor Temperature xxx Deg C
Sensor Remain Time xxxx Days
Current gas type
PV LSL 0% LEL/PPM
PV USL 100% LEL/PPM
PV Min span 1% LEL/PPM
Gas type and range
Manufacturer Net Safety
Model Millennium II Basic
Dev ID xxxxxx
Tag xxxxxxxxxxx
Long Tag xxxxxxxxxxxxxx
Descriptor xxxxxxxxxxxxxx
Message xxxxxxxxxxxxxx
Date xx/xx/xx
Final asmbly num xxxxxxx
Universal rev 7
Fld dev rev xx
Software rev xx
Poll addr xx
Loop current mode Disabled/Enabled
Num reg preams xx
Num resp preams xx
Current gas type
Custom K factor
PV U SL
Support gas type
Support USL(range
)
Sensor gas 1
Sensor gas 2
Sensor gas 3……….16
Sensor range 1
Sensor range 2
Sensor range 3…….5
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28 Monitoring and outputs
7.3 Relays (Optional)
7.3.1 Alarm relays
The Millennium II Basic transmitters come complete with two (2) programmable alarm relays. These
relays will change their state from their non-alarm state to an alarm state when gas concentrations, as
read by the sensor, go above the programmed alarm points set in the transmitter.
The alarm relays can be programmed to be energized or de-energized under normal conditions, and
then either latching or non-latching.
7.3.2 Fault relay
Millennium II Basic transmitters and sensors complete continual checks for situations that may prevent
the transmitter and sensor from providing an expected response to ambient conditions and records
these as a fault condition in the message log and the output(s) of the transmitter. When a system fault
is detected, the Red Status LED will flash fast (250 milliseconds on, 250 milliseconds off), the analog
output will output a 2.5 mA signal, and the fault relay will change states (de-energize to provide a fault
condition).
The fault relay is normally energized when no fault conditions are present and is set up for non-latching.
The operation of the fault relay is not configurable.
The Millennium II Basic transmitter provides various fault conditions to indicate that the transmitter or
connected sensor(s) are not operating as expected. These fault conditions will override any alarm
conditions because the sensor may be unable to detect a gas exposure reliably. Examples of fault
conditions can range from no detection due to memory or communication errors and sensor failure.
Other faults can provide unreliable detection due to sensor drift or sensor nearing the end of its life.
When a Millennium II Basic transmitter is in fault mode, immediate action should be taken to determine
the source and correct the fault condition.
The fault relay output is not commonly used to imitate an automatic shutdown. The fault output
indicates a potential problem with the transmitter not an alarm condition.
7.4 RS-485 Modbus
®
RTU (optional)
Modbus digital RS-485 Modbus RTU protocol is used.
The Millennium II Basic transmitter utilizes 2- wire Modbus RS-485 multi serial mode. This Modbus
solution implements a 2-wire electrical interface in accordance with the EIA/TIA-485 standards. For this
Modbus configuration, it is important that a third wire be used for connecting all the commons (COM)
in the chain. Also a 120 Ohm line termination is required for the last device in the line. See Figure 7-3.
The Instrument Engineer is responsible for calculating line length and adhering to Modbus protocols.
Reference Manual Monitoring and outputs
00809-0100-4034, Rev AA April 2019
Monitoring and outputs 29
Figure 7-3 Two-wire Modbus configuration
7.4.1 Modbus registers
Reg#
Meaning
Readable
Writeable
40001
Concentration value as calculated by sensor (RTUsensor_out), Channel 1
X 40002
Sensor status (RTUsensor_stat)
X 40003
Temperature of sensor element housing in Kelvin (RTU temperature)
X
40011
Calibration gas value
X
40021
Sensor class
X 40022
Low alarm value
X X 40023
High alarm value
X
X
40027
Current sensor range
X X 40101
Reset sensor
X
40102
Full calibration
X 40104
Zero calibration
X
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April 2019 00809-0100-4034, Rev AA
30 Monitoring and outputs
7.5 Transmitter output operation
The following table outlines the operation of the outputs of the Millennium II Basic transmitter under
different conditions. These outputs include the analog output, LED indications, and the relay outputs.
For the outputs’ status, refer to the descriptions below the table.
Condition
Current output
LED indication
Relay outputs
Fault
Alarm
No gas present
4 mA
Slow green
Normal state
Normal state
Gas present, concentration below alarm points
4-20 mA depending
on gas concentration
Slow red
Normal state
Normal state
Gas present, concentration above alarm points
4-20 mA depending
on gas concentration
Slow red
Normal state
Alarm state
Fault condition present, no gas present
2.5 mA
Very fast red
Fault state
Normal state
Fault condition present, gas present
2.5 mA
Very fast red
Fault state
Normal state
Fault condition present, gas above alarm points
2.5 mA
Very fast red
Fault state
Normal state
Electrochemical XChem sensors only:
Sensor end of life condition present, gas above or below
alarm points
2.5 mA for 10
seconds, 4-20 mA
for 50 seconds
Very fast red
Fault state for 5
seconds,
normal state for
55 seconds
Normal state
Fault relay: Fault state means that the relay is in the de-energized state. Normal state means that the
relay is in the energized state.
LED indications: Flash rates are outlined in the following table:
Flash description
On
Off
Slow
50 milliseconds
1 second
Fast
250 milliseconds
250 milliseconds
Very fast
50 milliseconds
50 milliseconds
Alarm relay(s): Alarm state means that if the relay is programmed for normally de-energized, the relay
will energize to alarm; if the relay is programmed for normally energized, the relay will de-energize to
alarm. Normal state is what state that the relay is programmed for (e.g. normally energized or normally
de-energized).
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Monitoring and outputs 31
7.6 Fault monitoring
Self-testing circuitry continuously checks for problems that could prevent proper response. When
power is applied to the Millennium II Basic Transmitter, a microcontroller automatically tests the
system to ensure that it is functioning properly. During normal operation, it continuously monitors the
signal from the internal sensor source. In addition, a watchdog timer is maintained to ensure the
program is running correctly. When a system fault is detected, the Status LED will have a red fast flash
and the fault signal will output a 2.5 mA signal. The transmitter’s event log may be viewed in order to
distinguish the fault condition.
The fault detection circuitry does not monitor the operation of external response equipment or
external wiring to the transmitter. It is important that external equipment and wiring be checked
periodically to ensure they are operational.
7.7 Fault conditions
Fault conditions will override any alarm conditions because the sensor may be unable to detect a gas
exposure reliably, as such, the alarm relay will not provide an output.
Fault conditions provided by an instrumentation device are critical indicators that the device is not
operating as expected; therefore, when a fault condition is present, immediate attention to that fault
condition is required.
Net Safety strongly recommends that the 2.5 mA analog fault condition and fault relay (if used) be
monitored in conjunction with alarm levels on the analog output and the alarm relay, if used.
7.7.1 Transmitter fault conditions
Fault conditions that the transmitter detects are as follows:
Fault condition
M2B
Input voltage less than 8 VDC
Input voltage more than 33 VDC
Critical memory fault
Onboard power supply fault
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32 Monitoring and outputs
7.7.2 Sensor fault conditions
Fault conditions that the various Millennium II sensors detect are as follows:
Fault condition
SC310
SC311
ST322
ST332
ST340
ST320
ST330
ST341
ST360
Zero calibration failure
Span calibration failure
Low temperature
High temperature
Low power
High power
Replace sensor
Zero drift
Signal invalid
Over-range
Memory fault
Power supply fault
Sensor end of life
Sensor weak signal
Sensor thermistor fault
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Maintenance 33
Section 8: Maintenance
8.1 Periodic response check
Net Safety Monitoring recommends that a bump test be performed every ninety (90) days to ensure
continued functionality and accuracy of the detection system. Full calibration is recommended when
the sensor fails to meet acceptable accuracy standards. This involves the application of calibration gas
to the sensor, then the observation of the response LEDs, analog output, and external monitoring
equipment. Be sure to prevent unwanted response of external monitoring devices and equipment
during this procedure. If the Millennium II Basic’s response to calibration gas is within the specified
accuracy then it is not necessary to perform a calibration.
Example: When 50 percent of full scale is applied, the response is expected to be between 11.5 mA (47
percent of full scale) and 12.5 mA (53 percent of full scale). An additional consideration is the accuracy
tolerance of the calibration gas which may be plus or minus a few percent. If the calibration gas is ±10
percent of full scale then the reading may be from 10.7 mA (42 percent of full scale) to 13.3 mA (58
percent of full scale).
8.2 Troubleshooting
Response to the input should be checked and, if necessary, calibration should be performed whenever
the accuracy of this check is not satisfactory. The system should also be checked when sensor or
transmitter is added or removed. If problems should develop, first check for faulty wiring, confirm
proper voltage to transmitter and attempt a calibration. If problems persist, please contact Net
Safety’s support department first by phone to try and resolve any issues. If issues cannot be resolved,
please follow the procedure on how to return equipment.
8.3 Storage
The transmitter and its electronic components/parts should be stored in locations free from dust and
moisture. The storage temperature should be well within the limits of the certified temperatures of the
equipment. See Section 11.2 for storage temperatures.
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April 2019 00809-0100-4034, Rev AA
34 Maintenance
8.4 Spare parts and accessories
Description
Part Number
3/4 NPT ATEX certified plug - aluminum
CP-AL-002
3/4 NPT ATEX certified plug – stainless steel
CP-SS-001
Conduit reducer - ¾-in. to M20 - aluminum
M20R
Conduit reducer - ¾-in. to M20 – stainless steel
M20R-SS
Aluminum separation kit
JB-MPD-A
Stainless steel separation kit
JB-MPD-S
Magnet assembly
MAGNET-1
Sun shade kit - requires UN-MK-1
SSK-2
1-in. pipe mounted sun shade kit/rain guard - includes UN-MK-31
SSK-51
2-in. pipe mounted sun shade kit/rain guard - includes UN-MK-32
SSK-52
3-in. pipe mounted sun shade kit/rain guard - Includes UN-MK-33
SSK-53
Millennium II Basic transmitter board - analog output
TX-M2B-A
Millennium II Basic transmitter board - analog/HART® output
TX-M2B-AH
Millennium II Basic transmitter board - analog/HART output for wireless
capable transmitters
TX-M2B-AH-FC
Millennium II Basic transmitter board - Modbus® output
TX-M2B-D
Millennium II Basic transmitter board - Relay output
TX-M2B-R
2-in. pipe mounting kit (stainless steel)
UN-MK-1
1-in. pipe mounting kit - All Millennium II & ECO-SENSE Gas Detectors
(stainless steel)
UN-MK-31
2-in. pipe mounting kit - All Millennium II & ECO-SENSE Gas Detectors
(stainless steel)
UN-MK-32
3-in. pipe mounting kit - All Millennium II & ECO-SENSE Gas Detectors
(stainless steel)
UN-MK-33
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Electrostatic sensitive device 35
Section 9: Electrostatic sensitive device
Definition: Electrostatic discharge (ESD) is the transfer, between bodies, of an electrostatic charge
caused by direct contact or induced by an electrostatic field.
The most common cause of ESD is physical contact. Touching an object can cause a discharge of
electrostatic energy. If the charge is sufficient and occurs near electronic components, it can damage
or destroy those components. In some cases, damage is instantaneous and an immediate malfunction
occurs. However, symptoms are not always immediate—performance may be marginal or seemingly
normal for an indefinite period of time, followed by a sudden failure.
To eliminate potential ESD damage, review the following guidelines:
• Handle boards by the sides —taking care not to touch electronic components.
• Wear grounded wrist or foot straps, ESD shoes or heel grounders to dissipate unwanted static
energy.
• Prior to handling boards, dispel any charge in your body or equipment by touching a grounded
metal surface.
• Ensure all components are transported and stored in ESD safe packaging.
• When returning boards, carefully package in the original carton and static protective wrapping.
• Ensure ALL personnel are educated and trained in ESD Control Procedures.
In general, exercise accepted and proven precautions normally observed when handling electrostatic
sensitive devices.
Wire resistance table Reference Manual
April 2019 00809-0100-4034, Rev AA
36 Wire resistance table
Section 10: Wire resistance table
Distance
Feet (Meters)
AWG #20
0.5 mm2
AWG #18
0.8 mm2
AWG #16
1.0 mm2
AWG #14
2.0 mm2
100 (30.5)
1.02
0.64
0.40
0.25
200 (61)
2.03
1.28
0.80
0.51
300 (91.4)
3.05
1.92
1.20
0.76
400 (121.9)
4.06
2.55
1.61
1.01
500 (152.4)
5.08
3.20
2.01
1.26
600 (182.9)
6.09
3.83
2.41
1.52
700 (213.4)
7.11
4.47
2.81
1.77
800 (243.8)
8.12
5.11
3.21
2.02
900 (274.3)
9.14
5.75
3.61
2.27
1000 (304.8)
10.20
6.39
4.02
2.53
1250 (381)
12.70
7.99
5.03
3.16
1500 (457.2)
15.20
9.58
6.02
3.79
1750 (533.4)
17.80
11.20
7.03
4.42
2000 (609.6)
20.30
12.80
8.03
5.05
2250 (685.8)
22.80
14.40
9.03
5.68
2500 (762)
25.40
16.00
10.00
6.31
3000 (914.4)
30.50
19.20
12.00
7.58
3500 (1066.8)
35.50
22.40
14.10
8.84
4000 (1219.2)
40.60
25.50
16.10
10.00
4500 (1371.6)
45.70
28.70
18.10
11.40
5000 (1524)
50.10
32.00
20.10
12.60
5500 (1676.4)
55.80
35.10
22.10
13.91
6000 (1828.8)
61.00
38.30
24.10
15.20
6500 (1981.2)
66.00
41.50
26.10
16.40
7000 (2133.6)
71.10
44.70
28.10
17.70
7500 (2286)
76.10
47.90
30.10
19.00
8000 (2438.4)
81.20
51.10
23.10
20.20
9000 (2743.2)
91.40
57.50
36.10
22.70
10000 (3048)
102.00
63.90
40.20
25.30
Resistance shown is one way. This figure must be doubled when determining closed loop resistance.
Reference Manual Specifications
00809-0100-4034, Rev AA April 2019
Specifications 37
Section 11: Specifications
11.1 Electrical
11.1.1 Operating voltage range
10.5 to 32 VDC
18 to 32 VDC (HART versions only)
11.1.2 Power consumption
1.5 W @ 24 VDC (average - varies by sensor types/quantities)
11.1.3 EMC compliance
EN 50270:2006 per EMC directive 2004/108/EC
11.2 Environmental
11.2.1 Operating temperature
-67 °F to +185 °F (-55 °C to +85 °C )
-58 °F to +185 °F (-50 °C to +85 °C) – North American explosion-proof certification
11.2.2 Relative humidity
0 - 95% RH non-condensing
11.2.3 Ingress protection
IP67
Type 4X
Specifications Reference Manual
April 2019 00809-0100-4034, Rev AA
38 Specifications
11.3 Mechanical
11.3.1 Enclosure material
Cast Aluminum (6061)
Stainless steel (SS316)
11.3.2 Conduit opening
¾-in. NPT (3X)
11.3.3 Weight
Aluminum: 2.0 lb. (0.8 kg)
Stainless Steel: 3.5 lb. (1.6 kg)
11.4 Warranty
3 years
Reference Manual Certifications
00809-0100-4034, Rev AA April 2019
Certifications 39
Section 12: Certifications
12.1 North American
Class I, Division 1, Groups BCD T5
Class I, Zone 1, AEx/Ex d IIB+ H2 T5
-50°C ≤ Ta ≤ + 85°C
NEMA Type 4X/IP 67
FM6320, ANSI/ISA 12.13.01, CSA C22.2 No. 152:2006
12.2 IECEx
Ex d IIB+H2 T5 Gb
-55°C ≤ Ta ≤ + 85°C
IP67
IEC 60079-0:2011/IEC60079-1:2007
IECEx FMG 14.0010X
12.3 FC Models
12.3.1 North America
Class I, Division 1, Groups BCD T5
Class I, Zone 1, AEx/Ex d IIB+ H2 T5
-50 °C ≤ Ta ≤ +85 °C
NEMA Type 4X/IP67
CSA C22.2 No. 152:2006, FM6320, ANSI/ISA 12.13.01
12.3.2 IECEx
Ex d IIB+H2 T5 Gb
-55 °C ≤ Ta ≤ +85 °C
IP67
IEC 60079-0:2011/IEC60079-1:2007
IECEx FMG 14.0010X
Special conditions for safe use:
• Consult the manufacturer if dimensional information on the flameproof joints is necessary.
• Follow the manufacturer’s instructions to reduce the potential of an electrostatic charging hazard.
Ordering information Reference Manual
April 2019 00809-0100-4034, Rev AA
40 Ordering information
Section 13: Ordering information
Model
Description
M2B
Millennium Basic II Single Channel Transmitter
Output
Description
A
Analog output
AH
Analog and HART® protocol output
D
Digital RS485 Modbus® RTU protocol output
R Relay output
Enclosure
Description
A
Aluminum
S
Stainless steel
Wireless
Description
_ Not required
FC
Emerson Wireless 775 THUMTM Adapter capable (used only with
AH or AHR outputs)
Notes
00809-0100-4034
Rev AA
April 2019
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