Macurco TX-6-ND User manual

Macurco™ TX-6-ND
Nitrogen Dioxide Detector, Controller and Transducer
User Instructions
Important: Keep these User Instructions for reference

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TABLE OF CONTENTS
GENERAL SAFETY INFORMATION 3
Intended Use 3
List of Warnings and Cautions 3
USE INSTRUCTIONS AND LIMITATIONS 4
UseFor 4
DoNotUseFor 4
General Description 4
Features 5
Specifications 5
INSTALLATION AND OPERATING INSTRUCTIONS 5
Location 6
Installation 6
Garage diagram 7
4-20 mA Output diagram 7
Multiple Device diagram 8
Alarm Control Panel diagram 8
DVP-120 Control Panel diagram 9
Alternate Alarm Panel 10
PowerUp 10
Operation 10
Default – Factory Settings 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
On Board Diagnostics 13
Sensor Poisons 14
MAINTENANCE 14
End-of-Warranty Signal 14
Sensor Replacement 15
Sensor Life Reset 15
Cleaning 16
Testing 16
Operation Test 16
Nitrogen Dioxide Test 18
Field Calibration Procedure 20
MACURCO GAS DETECTION PRODUCTS WARRANTY 22

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GENERAL SAFETY INFORMATION
Intended Use
The Macurco TX-6-ND is a low voltage, dual relay Toxic Gas (TX) detector, controller and transducer for Nitrogen Dioxide (NO2). The
TX-6-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 applications. The TX-6-ND is a low level meter capable of
detecting from 0-20ppm of Nitrogen Dioxide. The TX-6-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
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 0F or above 125F (-18C or above 52C). 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 relay 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.
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 ofthe monitor.Failure to do so mayadversely affect product performance and result in sickness or death.
When performinga 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
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USE INSTRUCTIONS AND LIMITATIONS
Each person using this equipment must read andunderstand the information inthese User Instructions beforeuse. Use of this
equipment by untrained or unqualified persons, or use that isnot in accordance with these User Instructions, may adversely affect
product performance and result in sickness or death.
Use For
The TX-6-ND provides Nitrogen Dioxide detection and automatic exhaust fan control forparking garages, loading docks, truck and bus
depots, firehouses, ambulance bays, warehouses andmaintenance facilities. Nitrogen dioxide or NO2is a toxic chemical of concern in
diesel exhaust. The higher average temperature of combustion of diesel engines generates more nitrogen oxides than gasoline
engines. The TX-6-ND meets the requirements of the Uniform Building Code for enclosed garages and meets OSHA standards for
Nitrogen Dioxide exposure. TX-6-ND can be used stand alone, with the Macurco DVP-120 Detection and Ventilation Control Panel,
other 12 VAC or 24 VDC fire/security panels or building automation systems.
Use only for monitoring the gas which the sensor and instrument are designed to monitor. Failure todo 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.
Do Not Use For
The TX-6-ND is not intended for use in hazardous locations or industrial applications such as refineries, chemical plants, etc. Do not
mount the TX-6-ND where the normal ambient temperature is below 0°F or exceeds 125°F (below -18C or above 52C). The TX-6-ND
mounts on a 4x4 electrical box supplied by the contractor. Do not install the TX-6-ND inside another box unless it has good air flow
through it.
This equipment may not function effectively below 0F or above 125F (-18C or above 52C). Using the detector outside of this
temperature range may adversely affect product performance and result in sickness or death.
General Description
The TX-6-ND is a low voltage, dual relay Nitrogen Dioxide (ND) detector and automatic ventilation controller. The TX-6-ND uses a
microcomputer controlled, electronic system to measure the concentration of Nitrogen Dioxide, actuate relays and provide a 4-20mA
output. The TX-6-ND has a field replaceable, electrochemical sensor (expected life of 2+ years) and optional gas test and calibration
kits. The TX-6-ND is a low level meter capable of displaying from 0-20ppm of Nitrogen Dioxide.
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Features
ETL Listed to UL61010-1 and CAN/CSA C22.2 No61010-1
Low level meter capable of displaying from 0-20 ppm Nitrogen Dioxide
The TX-6-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 connectsto warning devices or control panels
4-20 mA Current Loop
TX-6-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: 3 W (max) from 12 to 24 VAC or 12 to 32 VDC
Current @ 24 VDC:75 mA in alarm (two relays), 50 mA(fan relay only)and 23 mAstand by
Shipping Weight:1 pound (0.45kg)
Size: 4 1/2 x 4 x 21/8 in. (11.4 X 10.2 X 5.4 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 ornot 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 NO2, selectable to off (default) or on
Buzzer: 85 dBA at 10cm settable to off (default) or on
Digital display: 3 digit LED selectable to off (default) or on.
Operating environ:0°F to 125°F (-18C to 52C).10 to 90% RH
INSTALLATION AND OPERATING INSTRUCTIONS
The following instructions are intended to serve as a guideline for the use of the Macurco TX-6-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 youhave any doubts about the
applicability of the equipment to your situation, consultan industrial hygienist or call Technical Service at 1-877-367-7891.

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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-6-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-6-ND where the normal ambient temperature is below below 0°F or exceeds 125°F (below -18C or above
52C).
High voltage relay 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 resultin sickness or death.
Installation
1. The TX-6-ND mounts on a 4” square (or 4x4) electrical box supplied by the contractor. Do not mount the TX-6-ND inside
another box, unless it has good air flow through it.
2. Connect the TX-6-ND to Class 2 power supply only. It is suggested to use a separate transformer for powering the unit or units
because of possible interference’s fromother devices on the same power supply.
3. Connect the TX-6-ND to the control cables with terminal plugs.When making connections, make surethe power isoff.
4. There are two terminals for Power: 12 to 24 VACor 12 to 32 VDC, with no polarity preference.
5. There are two terminals forthe dry alarm relay contacts, again with nopolarity preference. The alarmrelay can switch upto 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.
6. 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.
7. 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.
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8. The Fan Relay can be configured forlatching 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.
9. 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 disengageonce both of these conditions havebeen met:
Nitrogen Dioxide concentration has dropped below fan setting
Fan Relay Run timehas 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.
10. The Current Loop is4 mA in clean air and 20 mAfor 20 ppm Nitrogen Dioxide

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Power Up
The TX-6-ND steps through an internal self-test cycle for the first 1 minute that it is powered. The unit will execute the test cycle any
time power is dropped and reapplied (i.e. power failure). During the self-test cycle the unit will display the Firmware Version number and
the gas type, then count down from 60 to 0 (if the display option is “on”) and finally go into normal operation. The alarm relay will be
activated for 10 seconds and the fan relay for 60 seconds during the power-up cycle unless the “Power Up Test” (PUt) option is OFF.
The indicator light (LED) will flash green during the self-test cycle. At the end of the 1 minute cycle, the unit will take its first sample of
the air and the indicator light will turn solid green.
Operation
1. With the display function turned “On”, the TX-6-ND will show the current concentration of NO2ppm or “0.0” (zero) in clean air.
When the NO2concentration reaches the Fan Relay setting (1.0ppm, for example) the display will flash back and forth between
“FAn” and “1.0”. With the display function turned ”Off”, the display does not show the gas concentration, butwill show “FAn” as
long as the fan relay is activated.
2. With the display function turned “On” and the NO2concentration reaching the Alarm Relay setting, (5.0ppm, for example) the
display will flash back and forth between “ALr” and “5.0”. The buzzer will sound indicating “Alarm” if the buzzer is turned “On”.
With the display function turned off the display does not show the NO2concentration, but will show “ALr” when the Alarm relay
is activated.
3. With the 4-20 mA function turned “On” and the NO2concentration climbing the 4-20 mA signal will ramp up corresponding to
the concentration (0-20 ppm).
Default Configuration – Factory Settings
The default Power Up Test setting is On
The default Display setting is Off
The default Buzzer setting is Off
The default Alarm Relay Setting is activation at 5.0 ppm
The default Alarm Relay Configuration is Normally Open
The default Fan Relay Setting is activation at 2.5 ppm
The default Fan Relay Delay setting is 3 minutes
The default Fan Relay Runtime setting is OFF
The default Fan Relay Latching condition is OFF
The default Trouble Fan Setting condition is OFF
The default 4-20mA Output setting is OFF
To change settings, remove the Philips screw on the front of the TX-6-ND. Pull off the front cover of the unit.