Macurco TX-12-ND User Manual
Macurco™ TX-12-ND
Nitrogen Dioxide Detector, Controller and Transducer
User Instructions
Important: Keep these User Instructions for reference
TABLE OF CONTENTS
GENERAL SAFETY INFORMATION 3
List of Warnings and Cautions 3
USE INSTRUCTIONS AND LIMITATIONS 4
Use For 4
Do Not Use For 4
General Description 4
INSTALLATION AND OPERATING INSTRUCTIONS 5
MAINTENANCE 14
Sensor Replacement 15
Field Calibration Procedure 20
MACURCO GAS DETECTION PRODUCTS WARRANTY 22
Intended Use 3
Features 5
Specifications 5
Location 6
Connections 6
Installation 7
Power Up 10
Operation 10
Default – Factory Settings 10
On Board Diagnostics 13
Sensor Poisons 14
End-of-Warranty Signal 14
Sensor Life Reset 15
Cleaning 16
Testing 16
4-20 mA Output diagram 8
Rear View Image 8
Alarm Control Panel diagram 8
Multiple Device diagram 9
Alternate Alarm Panel diagram 9
DVP-120 Control Panel diagram 10
Display setting 11
Buzzer setting 11
Alarm Relay setting 12
Alarm Relay Configuration 12
Fan Relay setting 12
Fan Relay Delay setting 13
Fan Minimum Runtime setting 13
Fan Relay Latching setting 13
Trouble Fan Setting 13
4-20mA Output setting 13
Operation Test 16
Nitrogen Dioxide Test 18
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GENERAL SAFETY INFORMATION
Intended Use
The Macurco TX-12-ND is a line voltage, dual relay Nitrogen Dioxide (NO2) detector, controller and transducer. The TX-12-ND utilizes
an internal switching power supply that is capable of using line voltage between 100 and 240VAC and 50-60Hz. The TX-12-ND has
selectable 4-20 mA output, buzzer and digital display options. It is an electronic detection system used to measure the concentration of
Nitrogen Dioxide and provide feedback and automatic exhaust fan control to help reduce Nitrogen Dioxide concentrations in parking
garages, maintenance facilities or other commercial applicatio ns. The TX-12-ND is a low level meter capable of detecting from 0-20ppm
of Nitrogen Dioxide. The TX-12-ND is factory calibrated and 100% tested for proper operation, but can also be calibrated in the field.
List of Warnings and Cautions within these User Instructions
! WARNING
Each person using this equipment must read and understand the information in these User Instructions before use. Use of this
equipment by untrained or unqualified persons, or use that is not in accordance with these User Instructions, may adversely affect
product performance and result in sickness or death.
Use only for monitoring the gas which the sensor and instrument are designed to monitor. Failure to do so may result in exposures
to gases not detectable and cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical
Service at 1-877-367-7891.
This equipment may not function effectively below 0F or above 125F (-18C or above 52C). Using the detector outside of this
temperature range may adversely affect product performance and result in sickness or death.
This detector helps monitor for the presence and concentration level of a certain specified airborne gas. Misuse may produce an
inaccurate reading, which means that higher levels of the gas being monitored may be present and could result in overexposure
and cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical Service at 1-877-367-7891.
High voltage terminals (100/240 VAC) are located within this detector, presenting a hazard to service technicians. Only qualified
technicians should open the detector case and service the internal circuits. Ensure power is removed from the detector relays prior
to servicing the unit. Failure to do so may result in sickness or death.
Do not disassemble unit or attempt to repair or modify any component of this instrument. This instrument contains no user
serviceable parts, and substitution of components may impair product performance and result in sickness or death.
Using a certified gas with a concentration other than the one listed for this detector when conducting a calibration or calibration
verification test (bump test) will produce inaccurate readings. This means that higher levels of the gas being monitored may be
present and could result in overexposure and cause sickness or death. For proper use, see supervisor or User Instructions, or
call Technical Service at 1-877-367-7891
The following steps must be performed when conducting a calibration or calibration verification test (bump test) to ensure proper
performance of the monitor. Failure to do so may adversely affect product performance and result in sickness or death.
When performing a calibration or calibration verification test (bump test) only use certified calibration gas at the
required concentration level. Do not calibrate with expired calibration gas.
If the instrument cannot be calibrated, do not use until the reason can be determined and corrected.
Do not cover or obstruct display or visual alarm
Ensure sensor inlets are unobstructed and is free of debris
3
USE INSTRUCTIONS AND LIMITATIONS
! WARNING
Each person using this equipment must read and understand the information in these User Instructions before use. Use of this
equipment by untrained or unqualified persons, or use that is not in accordance with these User Instructions, may adversely affect
product performance and result in sickness or death.
Use For
The TX-12-ND provides Nitrogen Dioxide detection and automatic exhaust fan control for parking garages, loading docks, truck and bus
depots, firehouses, ambulance bays, warehouses and maintenan ce facilitie s. Nitrogen d ioxide or NO2 is a toxic chemical of co ncern in
diesel exhaust. The higher average temperature of combustion of diesel engines generates more nitrogen oxides than gasoline
engines. The TX-12-ND meets the requirements of the Uniform Building Code for enclosed garages and meets OSHA standards for
Nitrogen Dioxide exposure. TX-12-ND can be used stand alone, with the Macurco DVP-120 Detection and Ventilation Control Panel,
other fire/security panels or building automation systems.
! WARNING
Use only for monitoring the gas which the sensor and instrument are designed to monitor. Failure to do so may result in exposures to
gases not detectable and cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical Service at 1877-367-7891.
Do Not Use For
The TX-12-ND is not intended for use in hazardous locations or industrial applications such as refineries, chemical plants, etc. Do not
mount the TX-12-ND where the normal ambient temperature is below 0°F or exceeds 125°F (below -18C or above 52C). The TX-12ND mounts on a 4x4 electrical box supplied by the contractor. Do not install the TX-12-ND inside another box unless it has good air flow
through it.
! WARNING
This equipment may not function effectively below 0F or above 125F (-18C or above 52C). Using the detector outside of this
temperature range may adversely affect product performance and result in sickness or death.
General Description
The TX-12-ND is a line voltage, dual relay Nitrogen Dioxide (ND) detector and automatic ventilation controller. The TX-12-ND uses a
microcomputer controlled, electronic system to measure the concentration of Nitrogen Dioxide, actuate relays and provide a 4-20mA
output. The TX-12-ND has a field replaceable, electrochemical sensor (expected life of 2+ years) and optional gas test and calibration
kits. The TX-12-ND is a low level meter capable of displaying from 0-20ppm of Nitrogen Dioxide.
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Features
ETL Listed to UL 61010-1 and CAN/CSA C22.2 No 61010-1
Low level meter capable of displaying from 0-20 ppm Nitrogen Dioxide
The TX-12-ND meets Uniform Building Code for enclosed garages and OSHA standards for gas exposure
Selectable fan and alarm relay activation
5 A SPDT fan relay controls starters of exhaust fans
0.5 A N.O. or N.C. alarm relay connects to warning devices or control panels
4-20 mA Current Loop
TX-12-ND mounts on a standard 4x4 electrical box and becomes cover for the box
Supervised system: any internal detector problem will cause the fan & alarm relay to activate
Calibration kit is available. One screw allows access for calibration or gas test
Specifications
Power: 100-240VAC (50 TO 60 HZ)
Current: 1.0 A MAX
Shipping Weight: 1 pound (0.45 kg)
Size: 4 1/2 x 4 x 2 3/4 in. (11.4 X 11.4 X 7.0 cm)
Color: Dark gray
Connections: plugs/terminals
Mounting box: (not included) 4x4 electric
Fan relay: 5 A, 240 VAC, pilot duty, SPDT
Fan relay actuation: selectable at OFF, 0.5, 0.7, 1.0, 1.2, 1.5, 1.7, 2.0, 2.2, 2.5 (default), 2.7, 3.0, 3.2, 3.5, 3.7, 4.0, 4.2,
4.5, 4.7, 5.0 ppm
Fan Delay Settings of 0, 1, 3 (default), 5 and 10 minutes
Fan Minimum Run Time settings are OFF (default), 3, 5, 10 or 15 minutes
Fan relay latching or not latching (default) selectable
Alarm relay: 0.5A 120 V, 60 VA
Alarm relay actuation: selectable N.O. (default) or N.C.
Alarm relay settings: OFF, 1, 2, 3, 4, 5 (default), 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 ppm
Current Loop: 4-20 mA for 0-20ppm NO
Buzzer: 85 dBA at 10cm settable to off (default) or on
Digital display: 3 digit LED selectable to off (default) or on.
Operating Environment: 0°F to 125°F (-18C to 52C).10 to 90% RH
Operating altitude: Up to 5,000m (16,404ft)
INSTALLATION AND OPERATING INSTRUCTIONS
The following instructions are intended to serve as a guideline for the use of the Macurco TX-12-ND Nitrogen Dioxide Detector. It is not
to be considered all-inclusive, nor is it intended to replace the policy and procedures for each facility. If you have any doubts about the
applicability of the equipment to your situation, consult an industrial hygienist or call Technical Service at 1-877-367-7891.
2, selectable to off (default) or on
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! WARNING
This detector helps monitor for the presence and concentration level of a certain specified airborne gas. Misuse may produce an
inaccurate reading, which means that higher levels of the gas being monitored may be present and could result in overexposure and
cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical Service at 1-877-367-7891.
Location
A TX-12-ND is normally mounted at breathing level, about 5 feet (1.5 meters) above the floor on a wall or column in a central area
where air movement is generally good. The unit, on average, can cover about 5,000 sq. ft. (465 sq. meters). The coverage depends on
air movement within the room or facility. Extra detectors may be needed near any areas where people work or where the air is
stagnant. Do NOT mount the TX-12-ND where the normal ambient temperature is below below 0°F or exceeds 125°F (below -18C or
above 52C).
! WARNING
High voltage terminals (120/240 VAC) are located within this detector, presenting a hazard to service technicians. Only qualified
technicians should open the detector case and service the internal circuits. Ensure power is removed from the detector relays prior to
servicing the unit. Failure to do so may result in sickness or death.
General Wiring Information
With the exception of the safety ground, all field wiring is completed via modular connectors (provided). After wiring, simply plug the
modular connectors into the matching connectors on the back side of the detector.
Mains Power Connection
Mains connections should be done in accordance with National and Local Electrical Codes. Only qualified personnel should connect
Mains power to any device. Macurco recommends a minimum wire size of AWG18 and the wire insulator must be rated for 140°F
(60°C) service. The modular connector will accept wire from 12 to 24 AWG.
The safety ground wire should be secured to the ground screw of the metal electrical box. Tighten the screw and make sure the wire is
snug. Ensure that the wire cannot be pulled out from under the screw.
The Line (L) and Neutral (N) wires should be stripped 1/4 in. (6.5 mm), insert the wire into the ”L” and “N” wire positions of the modular
Fan/Power connector and tighten the screw clamp. Ensure that the wire cannot be easily pulled from the connector. Plug the modular
connection into the Fan/Power connection and ensure that it latches into the header properly.
Fan Relay Connection
All of the SPDT Fan relay terminals are available at the Fan/Power modular connector. Each Fan relay terminal normally open,
common and normally closed (NO, COM and NC) can accommodate a wire size 12 to 24 AWG. To install the wiring for the relays,
disconnect the connector from the header. Strip the insulation of each wire back approximately 1/4 in. (6.5 mm), insert the bare wire
into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be pulled from the connector. Plug the modular
connection into the Fan/Power connection and ensure that it latches into the header properly.
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Alarm Relay Connection
The external alarm connections (A and B) are available at the Alarm modular connector. There is no polarity for these connections. To
install the wiring for the alarm contacts disconnect the connector from the header on the detector. Strip the insulation of each wire back
approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be
pulled from the connector. When the wires are connected seat the modular connector into the header ensuring that the latch engages.
4-20mA Signal Connection
The positive and negative 4-20mA signal connections (+ and -) are available at the 4-20mA modular connector, a 2-position connector.
To install the wiring for the 4-20 mA contacts disconnect the connector from the header on the detector. Strip the insulation of each wire
back approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot
easily be pulled from the connector. When the wires are connected seat the modular connector into the header ensuring that the latch
engages.
NOTE: The 4-20mA current loop outputs may be used with the Macurco DVP-120 control panel or other systems. The 4-20mA signal
connections to detectors should be size AWG18 (minimum) for short runs. Refer to the table for recommended wire gauges. Do not
bundle detector 4-20mA signal connections with AC power cables to prevent electrical interference. If AC power connections must be
bundled with the detector 4-20mA signal cables, the signal connections should be made with twisted pair of the appropriate gauge, with
an overall foil and braid shield. All shields should be terminated at the DVP-120 end of the cable only. A ground stud is provided near
the bottom left corner of the DVP-120 panel.
Installation
1. The TX-12-ND mounts on a 4” square (or 4x4) electrical box supplied by the contractor. Do not mount the TX-12-ND inside
another box, unless it has good air flow through it.
2. There are two terminals for the dry alarm relay contacts, again with no polarity preference. The alarm relay can switch up to 0.5
A 120 V, or 60 VA. The alarm relay is activated if gas reaches or exceeds the alarm settings. See OPERATION section of
these User Instructions for details on relay settings.
3. The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.) and will activate if the gas
concentration exceeds alarm set point. It will deactivate once the gas concentration drops below the alarm set point. Note that
the “disable” setting will cause the alarm relay not to engage at all.
4. The dry contact, SPDT fan relay has three terminals. The common (COM.), normally open (N.O.) and the normally closed
(N.C.) contact. The fan relay can switch up to 5.0 A up to 240 VAC. See OPERATION section of these User Instructions for
details on relay settings.
5. The Fan Relay can be configured for latching or non-latching (default) when activated (when the gas concentration exceeds fan
relay set point). Once latched in, power will need to be interrupted or the “TEST” button pressed to un-latch the relay condition.
6. The Fan Relay will engage if the fan setting Nitrogen Dioxide concentration is exceeded for longer than the Fan Relay Delay
time. Unless it is configured for latching, the fan relay will disengage once both of these conditions have been met:
Nitrogen Dioxide concentration has dropped below fan setting
Fan Relay Run time has been exceeded
Note that the “disable” fan setting will cause the fan relay to not engage. The fan relay will engage in trouble fault condition (if
the Trouble Fan Setting Option is set to “ON”) and will disengage once trouble fault condition is cleared.
7. The Current Loop is 4 mA in clean air and 20 mA for 20 ppm Nitrogen Dioxide
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