Instructions - Det
Instructions
Nanotechnology
Metal Oxide Semiconductor (NTMOS)
H2S Gas Detector
2.2
Rev: 6/12
95-8670
Table Of Contents
APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Detector Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Det-Tronics Optional Junction Boxes . . . . . . . . . . . . . . . . . . . . . . . 2
Det-Tronics Displays/Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Detector Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Wiring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
STARTUP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Frequency of Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Calibration Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Functional (Bump) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Detector Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
DEVICE REPAIR AND RETURN . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
APPENDIX A – FM APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
APPENDIX B – CSA APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
APPENDIX C – ATEX/IECEX APPROVALS . . . . . . . . . . . . . . . . . . . . .15
APPENDIX D – ADDITIONAL APPROVALS . . . . . . . . . . . . . . . . . . . . .16
INSTRUCTIONS
Nanotechnology
Metal Oxide Semiconductor (NTMOS)
H2S Gas Detector
CAUTION
Be sure to read and understand the entire
instruction manual before installing or operating
the gas detection system. This product is intended
to provide early warning of the presence of H2S
gas. Proper device installation, operation, and
maintenance is required to ensure safe and
effective operation. If this equipment is used in
a manner not specified in this manual, safety
protection may be impaired.
APPLICATION
FEATURES
Detector Electronics Corporation’s (Det-Tronics) NTMOS
stand-alone gas detector delivers an ideal detection
solution in environments where electrochemical sensing
technologies are not suitable and extreme temperature
or humidity variations exist.
•
Fast response to all H2S concentrations
•
Linear 4–20 mA output signal corresponding to H2S
concentration (non-isolated)
•
Performance approved to ANSI/ISA 92.0.01
•
The NTMOS H2S Detector uses the latest
Nanotechnology (NT) to ensure the highest
performance and reliability. The sensing element
is packaged and protected in a rugged stainless
steel housing, making it suitable for installation in
hazardous locations.
Non-intrusive calibration using the internal magnetic
reed switch on the Gas Detector Termination Box
model GDTB or FlexVu® UD10
•
Automatic fault diagnostics via current output
•
Detector approved as a stand alone unit and
provides automatic calibration initiation capability
•
The NTMOS Detector is tested to the ANSI/ISA 92.0.01,
Part I-1998, Performance Requirements for Toxic GasDetection Instruments: Hydrogen Sulfide. The standard
is utilized for the protection of personnel working
in hazardous industries, such as in the on/off shore
production of oil and gas.
Easily integrated with the Eagle Quantum Premier®
(EQP) system using the Analog Input Module (AIM)
to provide display and control capabilities
•
Ideal for extreme environmental conditions (onshore
and offshore applications)
•
Ingress Protection level of IP66/IP67 suitable for
outdoor applications.
This recommended practice applies to all toxic gas
detection instruments that satisfy the performance
requirements in ANSI/ISA 92.0.01. It establishes user
criteria for the installation, operation, and maintenance
of toxic gas detection instruments, while meeting API
requirements 14C, RP92.0.02 and others. Refer to
Appendix A for ANSI/ISA 92.0.01 test results.
DESCRIPTION
The NTMOS Detector uses the latest nanotechnology
for detecting the presence of hydrogen sulfide gas.
The sensor provides improved accuracy, reliability,
and extended calibration intervals when compared to
ordinary solid state type sensors. Unlike typical metal
oxide sensors, the sensor in the NTMOS Detector will not
fall asleep during operation.
The NTMOS Detector has multiple third party related
approvals. Refer to the Appendices section for more
details.
2.2 ©Detector Electronics Corporation 2016
Rev: 6/1295-8670
DETECTOR OUTPUT
U9500 Infiniti Transmitter
The non-isolated 0–20 mA dc drive circuitry is rated at a
maximum 600 ohms loop resistance with 24 Vdc supply
voltage.
The U9500B Infiniti® transmitter is a single channel
device. In addition to the standard 0-20 mA analog signal
output, the U9500B offers four optional relay outputs for
fault and alarm indications. The four outputs are: fault,
high alarm, low alarm, and auxiliary alarm. The relays
have form C (SPDT) contacts. The alarm relay contacts
are selectable as a group for latching or non-latching.
During normal operation, the fault relay is non‑latching,
but for initialization faults, the fault relay latches. The
alarm relays are also selectable, as a group, for normally
energized or de-energized (no alarms). The fault relay is
always normally energized (no fault). Refer to the Infiniti
Transmitter instruction manual for complete information
regarding the transmitter.
DET-TRONICS OPTIONAL JUNCTION BOXES
When not connected directly to a transmitter/control
device, the NTMOS Gas Detector can be connected
to a Gas Detector Termination Box (GDTB) Termination
Box. The GDTB contains a circuit board with the required
connectors for proper field wiring, as well as an internal
magnetic switch for non-intrusive detector calibration
and an LED to indicate calibration status. Refer to the
GDTB instruction manual, number 95-8644, for complete
information regarding the GDTB.
DET-TRONICS DISPLAYS/TRANSMITTERS
INSTALLATION
The NTMOS Gas Detector integrates easily with the
following Det-Tronics transmitters:
CAUTION
The wiring procedures in this manual are intended
to ensure proper functioning of the device under
normal conditions. However, because of the
many variations in wiring codes and regulations,
total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies
with applicable regulations that relate to the
installation of electrical equipment in a hazardous
area. If in doubt, consult the authority having
jurisdiction before wiring the system.
FlexVu Model UD10
The FlexVu UD10 Display Unit provides the approved
function of a low concentration gas controller for the
NTMOS Detector. The UD10 is designed and approved
as a stand-alone controller when connected to a certified
gas detector, such as the NTMOS, and performs all the
functions of a gas controller.
Gas concentrations are displayed on an alphanumeric
display in PPM. The UD10 provides a linear isolated/
non-isolated 0–20 mA DC output signal (with HART)
that corresponds to the detected gas concentration or
indicates a fault condition.
IMPORTANT
Considering that H2S is heavier than air, and in
order to maintain IP66/IP67 Ingress Protection
rating, the detector must be mounted vertically at a
maximum height of 18 inches from surfaces below.
All electronics are enclosed in an explosion-proof
aluminum or stainless steel housing. The display unit is
used with a single detector that may be either coupled
directly to the UD10, or remotely located using a Sensor
Termination Box model STB or GDTB.
NOTE
The NTMOS Detector shall be connected to a
performance certified low concentration gas
controller, with latching alarms.
The UD10 features non-intrusive calibration. A magnet
is used to perform calibration as well as to navigate the
internal configuration menu. Refer to the UD10 instruction
manual for complete information regarding the FlexVu
UD10 Display Unit.
2.2
CAUTION
Exposing the NTMOS Detector to silicones will
dramatically reduce its sensor response and
sensor life, and must be avoided.
2
95-8670
DETECTOR POSITIONING
Proper detector location is essential for providing
maximum protection. The most effective number
and placement of detectors varies depending on the
conditions at the job site. The individual designing
the installation must rely on experience and common
sense to determine the number of detectors needed
and the best locations to adequately protect the area.
The following factors are important and should be
considered for every installation:
CORRECT
INCORRECT
Figure 1—Recommended Orientation of NTMOS Detector (with UD10)
1. Since hydrogen sulfide is a highly toxic gas, a
primary consideration in determining optimum
detector locations is to identify where the most
likely release point of the hazard is located. Use
local or recommended practices to identify these
locations.
WIRING REQUIREMENTS
The maximum allowable distance between the NTMOS
Detector and transmitter/control device is limited by the
resistance of the cabling used. To ensure proper operation,
a minimum of 18 Vdc is required at the detector.
2. Factors such as vapor density should also be
considered when determining detector locations.
Hydrogen sulfide is slightly heavier than clean air,
and therefore may tend to settle near the floor or
ground, unless it is heated, mixed with other gases
that are lighter than air, or prevented from doing so
by ambient air movement patterns.
When mounted remotely from the transmitter/controller,
shielded cable or dedicated conduit is required for wiring
the detector. Ground the shield at the transmitter/controller
end only.
3. How rapidly will the H2S gas diffuse into the air?
Select a location for the detector as close as practical
to an anticipated leak source. As gas disperses it
becomes difficult to detect as it is diluted.
In applications where the detector cable is installed
in conduit, the conduit should not be used for wiring to
other electrical equipment whenever possible. If other
equipment power wiring is run in the same conduit, the
detector cabling must be shielded.
4. Detectors should be placed where the most
concentrated accumulation of hydrogen sulfide
gas is anticipated. Also consider the fact that some
ventilation systems do not operate continuously,
and therefore areas with poor circulation should be
evaluated for toxic gas accumulation.
If an additional signal conditioning or relay output
transmitter is being used along with the NTMOS Detector,
refer to the specific transmitter manual for detailed wiring
instructions.
5. The detector must always be installed pointing
straight down (see Figure 1).
It is important that moisture not be allowed to come in
contact with the electrical connections of the system.
6. The detector must be accessible for testing and
calibration. Allow adequate space for attaching
the NTMOS approved H2S calibration device.
See Specifications section of this manual for
dimensions.
Use proper piping techniques, breathers, glands, and
seals as required to prevent water ingress and/or maintain
explosion-proof ratings.
7. Exposure to excessive heat or vibration can cause
premature failure of electronic devices, and should
be avoided if possible. Shielding the device from
intense sunlight will reduce solar heating. For details
regarding the operating and storage temperatures of
the NTMOS Detector, refer to “Temperature Range”
in the Specifications section.
Table 1—NTMOS Detector Wiring Identification
Wire Color
Function
Red
24 Vdc +
Black
24 Vdc –
White
4 –20 mA Signal
Yellow*
Calibrate Line
Orange**
Connect to Isolated Spare
Grey**
Connect to Isolated Spare
* If the yellow wire is not being used, do not connect it to dc minus.
**
For factory use only. Connect to isolated Spare terminal or
tape off to prevent contact to any conductor.
2.2
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95-8670
INSTALLATION AND WIRING
1. Determine the best mounting locations for the
detector. Mount the detector with the sensing element
pointing down (18 inches from surfaces below).
The junction box (GDTB or transmitter housing) is
intended for flat-surface mounting, such as on a
wall or post. A spacer or stand-off (1/4 to 1/2 inch)
may be needed to allow adequate clearance for
the detector and calibration cup. The junction box
should be electrically connected to earth ground.
ORANGE1
GREY1
YELLOW
BLACK
WHITE
RED
UD10
DISPLAY UNIT
SHIELD
P1
J2
J2-2
RS485 A
J2-1
RS.485 B
J4-2
J4-3
AUX ALARM COM
J4-4
AUX ALARM NC
J4-5
AUX ALARM NO
J4-6
LOW ALARM COM
J4-7
LOW ALARM NC
J4-8
LOW ALARM NO
J4-9
24 VDC –
SHIELD
24 VDC –
24 VDC +
SHIELD
P2-4
P2-3
P2-2
P2-1
NTMOS H2S
DETECTOR
J4-10
FAULT COM
24 VDC +
MODBUS
Connector
J4-1
HIGH ALARM NC
HIGH ALARM NO
P2-5
To ease installation and future removal, use Teflon
tape for the male threads of the detector. The
Lubriplate grease (see the “Ordering Information”
section of this manual for part number) is used to
lubricate the threads on the junction box cover. The
use of silicone grease must be avoided.
COM
HIGH ALARM COM
P2-6
NOTE
J2-3
J3
Relay Connector
P1-1
4-20 mA J3-4
4-20 mA –
24 VDC + J3-5
4-20 mA +
P1-2
24 VDC – J3-3
P1-3
SHIELD J3-1
Output Loop
Connector
CALIBRATE J3-2
Sensor Connector
FAULT NC
J4-11
FAULT NO
J4-12
J4
P2
Power Supply Connector
1
GREY AND ORANGE WIRES ARE FOR
FACTORY USE ONLY. THEY CAN BE
TAPED OFF IF LOCAL CODES ALLOW,
OR CONNECTED TO THE POWER
SUPPLY MINUS (24 VDC –) OR SHIELD
TERMINALS.
C2448
NOTE
UD10 HOUSING MUST BE ELECTRICALLY
CONNECTED TO EARTH GROUND
Figure 2—NTMOS Detector Wired to FlexVu Model UD10
2. Terminate all detector wiring at the proper terminals
and verify that bonding between detector housingto-ground terminal is less than 0.1 ohm. Refer to
Table 1 and Figures 2 to 5 for wiring details:
UD10
DISPLAY UNIT
CONNECT TO UD10 MODULE’S J3 WITH
FACTORY INSTALLED CABLE
RED
WHITE
BLACK
YELLOW
GREY
ORANGE
24V
4/20
CAL
RTN
SHIELD
J2
24V (RED)
RTN (BLACK)
4/20 (WHITE)
CAL (YELLOW)
COM 1 (GRAY)
COM 2 (ORANGE)
NTMOS
H2S DETECTOR
P1
NTMOS CONNECTOR BOARD
B2493
NOTE 1
REMOVE UD10 ELECTRONIC MODULE FOR ACCESS
TO NTMOS CONNECTOR BOARD (NO TOOLS REQUIRED).
NOTE 2
GREY AND ORANGE WIRES FOR FACTORY USE ONLY.
NOTE 3
HOUSINGS MUST BE ELECTRICALLY CONNECTED TO
EARTH GROUND.
Figure 3—NTMOS Wired Directly to UD10 via the NTMOS Connector Board
2.2
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95-8670
3. Confirm that the power and signal cabling for the
gas detector is the proper size and type, and is
appropriate for the application requirements. After all
electrical connections are made, double check the
terminations against the wiring diagrams to ensure
that all connections are properly terminated.
INFINITI TRANSMITTER
NO COM NC
FAULT RELAY
–
+
POWER
S
GREY
ORANGE
BLACK
RED
YELLOW
WHITE
CAL IN
RESET
PW
4. The NTMOS Detector is designed to operate at 24
Vdc nominally. Measure the delivered voltage at the
detector, especially for long cable runs, to ensure
that possible voltage drops have not compromised
the necessary 24 Vdc supply voltage. This
should be considered during system design and
commissioning.
NOTE
Do not apply power to the system with the junction
box cover removed unless the area has been
de‑classified.
NTMOS H2S
DETECTOR
E2361
Figure 5—NTMOS Detector Wired to U9500 Infiniti Transmitter
5. After confirming that the detector is properly installed
and wired, all electrical terminations are properly
made, and proper operating voltage is provided to
the detector, the installer may conduct the startup
procedure.
4-20
RET
+24
RET
+24
CAL
4-20
COMM 1
CAL
COMM 2
COMM 1
INTERNAL
MAGNETIC
2
REED SWITCH
COMM 2
GDTB TERMINATION BOX
CAL SWITCH
4-20 MA
24 VDC –
24 VDC +
1
1 CUSTOMER SUPPLIED NORMALLY OPEN
MOMENTARY CLOSURE SWITCH CAN BE
USED TO INITIATE CALIBRATION. MOMENTARY
CONNECTION TO POWER SUPPLY MINUS
(24 VDC -) INITIATES THE CALIBRATION
SEQUENCE.
GREY
ORANGE
YELLOW
WHITE
BLACK
RED
NOTES:
NTMOS H2S
DETECTOR
2 PLACE MAGNET AT THIS
LOCATION APPROXIMATELY ONE
INCH ABOVE MOUNTING
SURFACE TO ACTUATE SWITCH.
C2447
Figure 4—NTMOS Detector Wired to GDTB Termination Box for StandAlone Operation
2.2
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95-8670
STARTUP PROCEDURE
CALIBRATION
FREQUENCY OF CALIBRATION
WARNING
Ensure that any output loads actuated by
the detection system are bypassed to prevent
accidental or unnecessary activation of these
devices.
The calibration frequency required in different
applications can vary depending upon the amount of
background gas, concentration of H2S, and ambient
environmental conditions.
Calibration must be performed:
— When a new system is initially put into service.
— When the detector is replaced.
— If a transmitter, controller or other device used in
conjunction with the NTMOS Detector is replaced.
1. Apply power to the system.
2. Remove the (red) protective cap and desiccant bag
from the detector.
NOTE
Tra n s m i tte rs a n d d i s p l ay / c o n t ro l d ev i c e s
typically have a “warm-up” period to allow the
detector to stabilize before beginning normal
operation (the NTMOS Detector can remain
in warm-up for up to 30 minutes). After long
periods without power, the detector output may
still not have returned to zero ppm by the end
of the warm-up period. In some cases, an alarm
level of H2S may be indicated. Keep all output
loads that are actuated by the system in bypass
until all alarms clear.
The following calibration/bump test schedule is
recommended to ensure reliable operation in most
applications:
1.
2.
3.
4.
24 hours after initial power-up (initial calibration)
30 days after initial calibration
60 days after initial calibration
90 days after initial calibration
If all recommended calibration/bump tests are within
the acceptable limits, the tests can be performed
at (maximum) 90-day intervals thereafter. If large
adjustments occur (greater than 10%), calibration
intervals should be reduced.
3. Allow the detector to operate for 16 to 24 hours
prior to an initial calibration, then perform the
“Calibration Procedure" as described in the following
section. It may be necessary to refer to other
transmitter and/or controller manuals to complete
calibration.
CALIBRATION GAS
The NTMOS H2S detector must be calibrated using the
humidification tube with bottled H2S in air (Figure 6), or
with the ampoule calibration kit.
4.Complete any additional startup/commissioning
requirements as described in the manual provided
with the transmitter/control device.
5. Place the system in normal operation.
CAL CUP
REGULATOR
BOTTLED H2S
GAS IN AIR
HUMIDIFICATION TUBE KIT
(Includes cage and tubes)
A2503
Figure 6—Humidification Tube Assembly
2.2
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95-8670
IMPORTANT CALIBRATION NOTES
Calibrating a Stand-Alone NTMOS Detector
• Proper calibration requires the use of either
D e t - Tro n i c s’ N T M O S ca l i b ra t i o n k i t w i t h
humidification tube and bottled H 2 S in air
(p/n 010272-001), or the ampoule calibration
kit (p/n 007098-005).
1. A dc current meter capable of measuring 0–20 mA
must be connected to the current loop output. This
can be accomplished by connecting a dc ammeter
in series with the load or by connecting a digital
dc voltmeter across a known load resistance and
calculating the current flow using the formula: current (I) = voltage/load resistance.
• When calibrating with bottled H 2S in air, the
humidification tube must be utilized, or inaccurate
readings will occur.
2. If the detector is powered-up after a shutdown,
it must be allowed to warm-up for a period of 16
hours prior to calibration. (Before calibrating a new
detector, allow a 24 hour warm-up period after initial
power-up).
• WARNING: Using a gas mixture other than
50% span of H2S in air will produce inaccurate
calibration results, possibly resulting in a
dangerous condition if the detector under-reports
the level of H2S. Do not use bottled H2S with
nitrogen.
3. Initiate calibration by activating the calibration line.
4. The current output goes to 2.2 mA while the detector
automatically calibrates the zero output.
• Prevent all contact of any oil based material from
the humidification tube.
5. When the current output goes to 2.0 mA, apply 50%
span of H2S gas in air to the detector using the
humidification tube kit or the ampoule calibration
kit. When using the humidification tube it must be
attached to the detector via a cal cup before applying
gas, and ensure that the flow rate is set to 0.5 liters/
min.
If background H2S gas is present, it may be necessary
to purge the detector with clean air to ensure that an
accurate zero or “clean air” condition is present prior to
initiating calibration.
CALIBRATION PROCEDURE
6. Upon successful calibration, the current output will
go to 1.8 mA. Remove the calibration gas. The output
will go to 4 mA. Reference Table 2 for the calibration
sequence.
The NTMOS Detector requires zero and span
calibration, achievable with the NTMOS calibration kit
or the ampoule calibration kit. It is highly recommended
that the FlexVu UD10 Display Unit, GDTB Termination
Box, or Model U9500B Transmitter be utilized with the
NTMOS Detector to enable non-intrusive field calibration.
When using the UD10 or U9500B for calibration, refer to
the related manual for specific calibration instructions.
Table 2—NTMOS Detector Calibration Sequence
Current Output
Detector Action
2.2 mA
1.6 mA
2.0 mA
1.8 mA
4.0 mA
Zero Cal
Cal Failed
Span Cal
Cal Complete
Normal Operation
Operator Action
Actuate Cal Line
None
Repeat Calibration
Apply Cal gas
Remove Gas
NOTE
If the current output reads 1.6 mA, the calibration
has failed. Check the calibration gas expiration
date, verify that the calibration gas used is H2S
in air, or replace the detector and repeat the
calibration. Be certain that the humidification tube
is used during calibration.
2.2
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95-8670
MAINTENANCE
The NTMOS H2S Detector must be “functional tested”
using only Det-Tronics’ humidification tube kit or
the ampoule kit. All ampoule functional tests must
be performed using the Det‑Tronics H2S Mixer with
thumb screw ampoule breaker and internal mixing
fan (p/n 007067-001). When using either method to
perform a bump test do not use bottled H 2S with
nitrogen. When performing calibrations, validate the
expiration date of the gas cylinder.
The NTMOS Detector is an industrial-grade device,
suitable for a wide variety of challenging environmental
conditions. However, a routine maintenance schedule
is recommended to ensure that the detector is in
peak operating condition at all times. To ensure top
performance, service the device as follows.
VISUAL INSPECTION
DETECTOR REPLACEMENT
A visual inspection is recommended to ensure that
physical obstructions such as trash, debris, mud, snow,
or oil have not blocked or impeded hazardous gas access
to the detector. The frequency of a visual inspection is
determined by the application and environment.
The NTMOS Detector is not repairable. If calibration can
no longer be properly performed, the detector must be
replaced.
The area must be de-classified and power to the detector
should be removed prior to replacing the detector in a
hazardous area.
NOTE
If the device cannot be calibrated or responds
slowly to the calibration gas, check the condition
of the hydrophobic filter and the sensing element
before replacing the detector.
Follow the procedure below to replace the detector.
1. Remove power to the transmitter or controller prior to
replacing the detector.
FUNCTIONAL (BUMP) TEST
It is acceptable to perform a functional (bump)
verification test in place of a complete calibration if the
detector output in clean air appears stable and has been
calibrated recently.
2. Remove the transmitter/termination box cover.
3. Disconnect the detector wiring, then unscrew it from
the conduit entry.
4. Thread the wires for the replacement detector
through the conduit entry and screw the detector into
the conduit entry. Connect the detector wires to the
appropriate terminals.
This test involves applying calibration gas to the
detector while in normal operating mode and
confirming correct detector response. Proper
calibration requires the use of either Det-Tronics’
NTMOS calibration kit with humidification tube and
bottled H2S in air (p/n 010272-001), or the ampoule
calibration kit (p/n 007098-005). It is the operator’s
responsibility to bypass any and all system alarm
output devices, if necessary, prior to conducting the
bump test. If the bump test results are not acceptable,
then a complete calibration must be performed.
2.2
5. Replace the junction box cover.
6. Re-apply power. Refer to the “Startup Procedure” of
this manual.
An adequate supply of spare detectors should be kept
on hand for field replacement. For maximum protection
against contamination and deterioration, they should not
be removed from the original protective packaging until
the time of installation. To ensure maximum storage life,
detectors should be stored in their original packaging,
or if the bag has been opened, with the plastic cap
and desiccant capsule in place. Always calibrate after
replacing the detector.
8
95-8670
FILTER REPLACEMENT
IMPORTANT
A hydrophobic filter must be installed to maintain
the IP66/IP67 Ingress Protection rating. If a filter is
not installed, the detector assumes an IP53 rating.
INCORRECT
CORRECT
The hydrophobic filter provides protection against the
ingress of dust and water, while permitting free flow
of gas to the H2S sensor. The filter assembly is field
replaceable. Use the following procedure to replace
the filter if it is determined damaged or contaminated
after a visual inspection, or a failed bump test.
Figure 7—Hydrophobic Filter Placement
4. Inspect the O-ring that seals the filter assembly to
the housing and also the O-ring that seals the filter
assembly to the impact guard. Make sure that the
O-rings are clean, properly seated and in good
condition. Replace the O-rings (p/n 011364-001) if
they are damaged.
Speed of response will be impeded by the presence of
heavy levels of contamination on the filter, so periodic
inspection is necessary. If the filter is wet, simply let it
dry to restore peak performance. Dry dust can usually be
blown off the filter, but if the filter is contaminated with oil
and dirt, replacement is necessary.
5. Install the replacement filter in the impact guard so
that the reinforcing ribs are facing toward the sensing
element, as illustrated in Figure 7.
1. Loosen the set-screw that retains the impact guard
with a 1/16” Allen wrench (see Figure 8).
6. Install the impact guard on the NTMOS Detector, by
rotating it clockwise until firmly tight. Use care when
tightening the setscrew to prevent damage to the
threads on the impact guard.
2. Loosen the impact guard by rotating it counter
clock-wise.
3. Remove the filter assembly.
See the “Ordering Information” section of this manual for
replacement parts and accessories.
SET-SCREW
(Do not overtighten
when reassembling)
O-RINGS
NTMOS HOUSING
SENSING ELEMENT
HYDROPHOBIC
FILTER
A2568
IMPACT GUARD
Figure 8—NTMOS Detector Disassembly
2.2
9
95-8670
2.0
(5.0)
1.75
(4.5)
3/4 INCH NPT /
M25 THREAD
4.3
(11.0)
A2569
MOUNT 18” (TYPICAL)
FROM SURFACES
BELOW
Figure 9—Dimensions of NTMOS Detector in Inches (Centimeters)
3.9
(9.9)
8.8
(22.4)
3.3
(8.4)
4.4
(11.2)
8.0
(20.3)
A2455
Figure 10—Dimensions of NTMOS Detector with Ampoule Calibration Kit with Mixer Attached in Inches (Centimeters)
2.2
10
95-8670
SPECIFICATIONS
CALIBRATION CYCLE—
• 30 days after initial calibration
CURRENT OUTPUT—
0–20 mA.
•
MEASUREMENT RANGE—
0 to 100 ppm.
Every 90 days thereafter, or as required by the
application and environment.
INPUT VOLTAGE—
18 to 30 Vdc, 24 Vdc nominal.
DIMENSIONS—
See Figure 9 for NTMOS Detector
See Figure 10 for the NTMOS Detector with Calibration
Gas Mixer attached.
INPUT POWER—
2.5 watts maximum.
ENCLOSURE MATERIAL—
316 Stainless Steel.
TEMPERATURE RANGE—
Operating: –40°F to +149°F (–40°C to +65°C)
Storage:
–40°F to +149°F (–40°C to +65°C).
THREAD SIZE—
3/4 inch NPT or M25.
WARRANTY—
24 months from date of manufacture per Terms and
Conditions.
HUMIDITY RANGE—
5 to 95% RH.
RESPONSE TIME—
T20 ≤ 5.4 seconds with full scale gas applied
T50 ≤ 10.8 seconds with full scale gas applied
T90 ≤ 33 seconds with full scale gas applied.
SHIPPING WEIGHT—
1.7 pounds (0.77 kilogram).
CERTIFICATION—
ENVIRONMENTAL LOCATION—
Exposing the detector to certain materials or environments
can adversely effect its performance. These materials
and environments include: Silicones, Halides (Fluoride,
Chlorine, Bromine, and Iodine based compounds),
Heavy metals, and Acidic environments.
For complete approval details, refer to the appropriate
Appendix:
FM
®
APPROVED
Appendix A - FM
Appendix B - CSA
Appendix C - ATEX/IECEx
Appendix D - Additional Approvals
INGRESS PROTECTION—
See appendices for details.
CROSS SENSITIVITY—
500 ppm CO ≤ or = 10 ppm H2S
50 ppm H2 ≤ or = 5 ppm H2S
5 ppm NO2 ≤ or = 1 ppm H2S
100 ppm Methanol ≤ or = 50 ppm H2S
Cross sensitivity to Aromatic Volatile Organic Compounds
(e.g. Xylene, Toluene, and Benzene).
NOTE
The NTMOS Gas Detector is designed and
approved as a “stand alone” toxic gas detector.
BAROMETRIC PRESSURE—
Negligible effect.
WARM-UP TIME—
Up to 30 minutes.
CALIBRATION—
Single point, 50% span with Humidification tube kit, or
ampoule calibration required.
2.2
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95-8670
DEVICE REPAIR AND RETURN
Prior to returning devices, contact the nearest local
Detector Electronics office so that a Return Material
Identification (RMI) number can be assigned. A
written statement describing the malfunction must
accompany the returned device or component to
assist and expedite finding the root cause of the
failure.
Transmitter:
U9500B Infiniti,
Specify with/without relays, aluminum
or stainless steel housing.
Display Unit:
FlexVu UD10,
Includes relays, 0–20 mA w/HART.
Specify aluminum or stainless steel
housing.
Termination Box: Model GDTB,
specify tall or short cover, aluminum
or stainless steel.
Pack the unit properly. Always use sufficient packing
material. Where applicable, use an antistatic bag as
protection from electrostatic discharge.
ACCESSORIES
NOTE
Det-Tronics reserves the right to apply a service
charge for repairing returned product damaged as
a result of improper packaging.
Return all equipment transportation prepaid to the factory
in Minneapolis.
NOTE
It is highly recommended that a complete spare
be kept on hand for field replacement to ensure
continuous protection.
Part Number
Description
010272-001
NTMOS Calibration Kit, 50 ppm H2S
in air
227117-014
Bottled 50 ppm H2S gas in air
162552-003
Regulator, 0.5 LPM
007098-005
Ampoule Calibration Kit, 50 ppm H2S:
Used for performing functional test
and calibration
225741‑001
Ampoule: 50 ppm H2S.
007067-001H2S Calibration Gas Mixer with
thumb screw ampoule breaker and
internal mixing fan
009700-001
Calibration Magnet: Used for
calibrating and programming the
UD10 or Infiniti Transmitter
When ordering, please refer to the NTMOS H2S Gas
Detector Model Matrix:
011364-001
Replacement O-rings Kit (2 provided)
010851-001
Replacement Impact Guard
MODEL DESCRIPTION
400527-003
Replacement Set-Screw
010850-001
Hydrophobic filter
010525-001
Humidification Tube Cage
ORDERING INFORMATION
NTM
Nanotechnology MOS H2S Gas Detector
TYPE MATERIAL
S
Stainless Steel
TYPE THREAD TYPE
N
3/4 NPT
M
Metric M25
TYPE MEASUREMENT OPTIONS
10
0-100 ppm
TYPE APPROVALS
2.2
B
INMETRO (Brazil)
R
VNIIFTRI (Russia)
W
FM/CSA/ATEX/IECEx
12
95-8670
APPENDIX A
FM APPROVAL
NOTE
The NTMOS Gas Detector is designed and approved as a “stand alone” toxic gas detector.
Hazardous Location
Class I, Division 1, Groups B, C, D
Class I, Division 2, Groups A, B, C, D
–40°C to +65°C (Performance verified)
–40°C to +75°C (Haz Loc Rating)
IP66/IP67 (with hydrophobic filter)
IP53 (without hydrophobic filter)
Performance tested to ANSI/ISA-92.0.01 – Sample of test requirements
Gas Detected
ANSI/ISA 92.0.01: 1998 (App. A)
H2S Requirement
Det-Tronics IP66/IP67 Model NTM
Series Approved Performance
Full Scale Range
10 - 100 ppm full scale
10 - 100 ppm full scale*
Operating Temperature Range
–10°C to +50°C
–40°C to +65°C*
Storage Temperature Range
–35°C to +55°C
–40°C to +65°C*
Test Gas Concentration
45 - 55% of full scale
Test Gas Tolerance
1 ppm or 5% of concentration 1
45 - 55% of full scale
1 PPM or 5% of reading
Accuracy/repeatability (Readout or display) 2 ppm or 10% of reading1
2 PPM or 10% of reading
Accuracy/repeatability (Alarm-only)
2 ppm or 10% of reading1
2 PPM or 10% of reading
Alarm setpoint
50% of full scale
10 to 90% of full scale
Time, Response to 20% of Final
20 seconds
5.4 seconds
Time, Response to 50% of Final
45 seconds
10.8 seconds
Time, Response to 90% of Final
60 seconds
33.0 seconds
Time, Recovery to 50% of Initial
180 seconds
6.7 seconds
Time, Recovery to 10% of Initial
90 seconds
16.3 seconds
High Concentration
1000 PPM
1000 ppm
High Concentration Recovery Time
10 minutes
<= 2 minutes
1
Where two values exist (e.g., 3 PPM or 10% of reading), the value providing the widest tolerance should be used.
*In accordance with FMID 3033318.
Acidic atmospheres excluded.
Accuracy
Performance tested to ANSI/ISA-92.0.01:
±10% of applied gas concentration or ±2 ppm whichever is greater.
Temperature variation
Performance tested to ANSI/ISA-92.0.01:
–10°C to +50°C, ±5 ppm at 50 ppm of applied gas concentration.
Det-Tronics verified:
–40°C to -10°C, ±10 ppm at 50 ppm of applied gas concentration
+50°C to +65°C, ±8 ppm at 50 ppm of applied gas concentration.
Humidity variation
Performance tested to ANSI/ISA-92.0.01:
5 to 95% RH: ±5 ppm at 50 ppm of applied gas concentration.
Response time (with full Ingress Protection applied)
T50 ≤10.8 seconds with full gas scale applied
T90 ≤33.0 seconds with full gas scale applied.
Mechanical
Model with hydrophobic filter and sinter guard (IP66/IP67)
Model with hydrophobic filter removed and sinter guard (IP53).
2.2
13
95-8670
APPENDIX B
CSA APPROVAL
NOTE
The NTMOS Gas Detector is designed and approved as a “stand alone” toxic gas detector.
PRODUCTS
CLASS 4828 02 – SIGNAL APPLIANCES - Toxic Gas Detection Instrument - For Hazardous Locations
Class I, Div. 1, Groups B, C & D (T5); Class I, Div. 2, Groups A, B, C, and D (T5); IP53 without Filter, IP66 / IP67 with Filter.
NTMOS H2S Toxic Gas Detector , Model NTM Series, input voltage 18-30 Vdc maximum and 2.5 W maximum, output
rated 4-20 mA, Tamb= –40°C to +75°C (Haz Loc Rating). Sensors can be used in conjunction with the following
DETECTOR ELECTRONICS CORPORATION Gas Detection Equipment: R8471B Series Controller (Ordinary locations),
U9500B Series Transmitter, UD10 Universal Display, Models PIRTB, STB or GDTB Termination boxes. Thread type 3/4”
NPT or M25.
APPLICABLE REQUIREMENTS
CAN / CSA-C22.2 No. 0-M91 - General Requirements – Canadian Electrical Code, Part II.
C22.2 No. 30-M1986 - Explosion-Proof Enclosures for Use in Class I Hazardous Locations.
CSA Std C22.2 No. 142-M1987 – Process Control Equipment.
IEC Std 60529: 2001-02 Degrees of protection provided by enclosures (IP Code).
2.2
14
95-8670
APPENDIX C
ATEX/IECEX APPROVALS
NOTE
The NTMOS Gas Detector is designed and approved as a “stand alone” toxic gas detector.
Hazardous Location
ATEX: 0539
II 2 G
Ex d IIC T5 Gb
FM09ATEX0063X T5 (Tamb= –40°C to +65°C)
IP66/IP67 (with hydrophobic filter and sinter guard)
IP63 (without hydrophobic filter).
FM
®
APPROVED
EN Standards:
EN 50270: 2006
EN 60079-0: 2009
EN 60079-1: 2007
EN 60529: 1991+ A1 2000.
IECEx:
Ex d IIC T5 Gb
IECEx FMG 09.0011X
T5 (Tamb= –40°C to +65°C)
IP66/IP67 (with hydrophobic filter and sinter guard)
IP63 (without hydrophobic filter).
IEC Standards:
IEC 60079-0: 2007
IEC 60079-1: 2007
IEC 60529: 2001
Special Conditions for Safe Use (X) / Schedule of Limitations:
• The NTMOS Hydrogen Sulfide Toxic Gas Detector shall be connected directly to a junction box or instrument
suitable for the area of installation to provide protection for the flying leads.
•
The NTMOS Hydrogen Sulfide Toxic Gas Detector, when the optional sinter guard is not fitted, meets the impact
test requirements according to the low level risk of mechanical danger. Therefore, when the optional guard is not
fitted, the NTMOS Hydrogen Sulfide Toxic Gas Detector must be located and installed such that the risk of impact
is reduced.
•
In order to maintain IP66/IP67 Ingress Protection rating, the detector must be mounted vertically at a maximum
height of 18 inches from surfaces below.
2.2
15
95-8670
APPENDIX D
ADDITIONAL APPROVALS
Hazardous Location
UL-BR 15.0377X
Ex d IIC T5 Gb IP66
T5 (Tamb = –40°C to +65°C)
IP63/IP66/IP67
IEC Standards: IEC 60079-0: 2007
IEC 60079-1: 2007
IEC 60529: 01.
Mechanical
Model with or without filter assembly
NOTE
For use with the GDTB, all cable entry devices shall be Brazil certified in the type of explosion protection,
flameproof enclosure “d,” suitable for the conditions of use and correctly installed with an ingress protection
rating of IP66/IP67. A screw or cover lock is provided for secondary means of fastening the cover.
RUSSIA
VNIIFTRI
CERTIFICATE OF CONFORMITY GOST R 523350.X -2005
No POCC US. ГБ06.В01237
1ExdIICT5 X
T5 (Tamb = –40°C to +65°C)
IP66/IP67.
Mechanical
Filter assembly is required to maintain IP66/IP67
2.2
16
95-8670
95-8670
FlexSonic ® Acoustic
Leak Detector
X3301 Multispectrum
IR Flame Detector
­Corporate Office
6901 West 110th Street
Minneapolis, MN 55438 USA
www.det-tronics.com
PointWatch Eclipse ® IR
Combustible Gas Detector
Phone: 952.946.6491
Toll-free: 800.765.3473
Fax: 952.829.8750
det-tronics@det-tronics.com
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© 2016 Detector Electronics Corporation. All rights reserved.
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