Miltronics TAT420 User manual

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Model TAT420
NOTE: The LCD and Switch Option are no longer available.
User Manual

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WARRANTY
This product is fully warranted against defective materials
and/or workmanship for a period of one year after purchase,
provided it was not improperly used. For your protection,
please use this product as soon as possible. If returned, it must
be securely wrapped, sent prepaid and insured to:
Miltronics Mfg., Inc.
95 Krif Road
Keene, NH 03431
PH: 603-352-0187
EFax: [phone]
Please include a note with name, address, telephone number
and description of the problem. Although we provide
assistance on Miltronics, Pacer Instruments and Pacer Legacy
products both personally and through our literature, it is still
the total responsibility of the customer to determine the
suitability of the product for use in their application.
This manual is provided by Miltronics Mfg., Inc. without any
kind of warranty. Precautions have been taken in accurately
preparing this manual; however, we neither assume
responsibility for any omissions or errors that may appear nor
assume liability for any damages that result from the use of the
products in accordance with the information contained in the
manual.

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IMPORTANT SAFETY INFORMATION
Classifications
Danger: To Prevent Serious Injury or Death
Warnings in this classification indicate danger that may result in serious injury or death if
not observed.
Caution: To Prevent Damage to the Product
Warnings in this classification indicate risks of damage to the product that may void the
product warranty and/or calibration.
Description of Symbols
ESD Caution: To Prevent Damage to the Product
Warnings in this classification indicate risks of damage to the product that may void the
product warranty and/or calibration. Internal components are static sensitive and are not
user serviceable. Opening the cases by a non-authorized service center and/or in a non-
ESD safe environment may cause damage not covered by the manufacturer’s warranty.
Important: Mandatory Action Required
The specific action is given near this symbol.
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to part 15 of the FCC rules. These limits are designed
to provide reasonable protection against harmful interference. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not
occur in a particular situation.

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IMPORTANT SAFETY INFORMATION (continued)
EU – Declaration of Conformity
Miltronics Mfg. Svcs., Inc. declares that the product for this manual complies
with the essential requirements and other relevant provisions of Directive
1999/5/EC. A copy of the Declaration of conformity is available on request.
RoHS Statement
Concerning EU-Directive 2011/65/EU (RoHS 2), to the best of our knowledge,
based on supplier provided information, all Miltronics Mfg. Svcs., Inc. / Pacer
Instrument brand products, are not intentionally manufactured or formulated
with the following substances: Lead, mercury, cadmium, hexavalent chromium,
polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE).
Minimal levels established in the 2005 RoHS Directive still apply under Article
4(2), Annex II: 0.1% by weight in homogenous materials for lead, mercury,
hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl
ethers; 0.01% by weight in homogenous materials for cadmium. Please be
advised that we do not analyze for these substances.
WEEE – Waste Electrical and Electronic Equipment - 2002/96/EC
Miltronics Mfg. Svcs., Inc. asks that all our products to be recycled at the end of
their current use, to comply with local waste requirements. Miltronics supports
local Waste Electrical and Electronic Equipment (WEEE) directives where they
are in operation. That means that WEEE may not be disposed as unsorted
municipal waste but is to be collected separately. Miltronics consumer products
are therefore labeled with a crossed-out “wheelie-bin” symbol which you can
see above. Further, all our products bear any other appropriate symbols for their
respective region. WEEE may contain hazardous substances which may
negatively affect the environment and human health when disposed of through
normal channels. Miltronics is committed to reduce the negative environmental
and human health effects of WEEE.

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DANGER
Never touch the vane assembly blades and/or thermal sensors.
The vane assembly blades may contain sharp edges which may cause minor
cuts. The assembly contains precision bearings which are sensitive and the
blades are finely adjusted to specific pitches. Touching this assembly or its parts
may cause damage which can affect its operation and the calibration.
NOTE: If the vane assembly head or probe head requires cleaning we
recommend a fine mist of isopropyl alcohol and a fine long-haired brush or send
the unit in or servicing.
Do not touch the circuit board when 120/220VAC is or has been
applied. Only connect 120/220VAC wires to the unit with power
disconnected. Double-check to make sure the wires are in the correct
terminals before applying power.
Power may still be present after voltage has been removed via storage in the
capacitors. Only authorized repairs can be accomplished after proper
discharging of the circuits.
CAUTION
When measuring, ensure that the direction arrow is facing the
direction of airflow.
The arrow indicates the direction of airflow for the data provided on the calibration
certificate. It is meant to allow for uniform and consistent readings as per the provided
data. The probe will operate in the opposite direction but the data may be different.
The transmitter case is designed to protect against dust and powerful
water jet penetration (IP 66), when properly closed. 2
Do not over-tighten the cover screws, only secure snugly. Over-tightening may cause
cover warping and damage. Only insert round, appropriate sized cables into the Liquid
Tight Cord Grips. Use of non-round, double cables/wires, or too small cabling may
reduce the IP rating and cause damage.

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CAUTION (continued)
Do not use or leave the instrument in a high temperature, high humidity,
high speed airflows or dusty environments for prolonged periods.
The instrument may not function properly out of the specified operating conditions and/or
have a greatly reduced operating life span.
Do not subject the instrument or the probe to strong impacts.
Dropping the instrument or the probe may cause damage or malfunction to the instrument
and may change the calibration data. We recommend sending it in immediately to be
checked.
Never disassemble, modify or repair the product.
Failure to observe the above may cause damage to the instrument or the probe. It may
also void the manufacturer’s warranty and calibration certificate.
Do not pick up or carry the instrument by the cable.
It may cause a malfunction or damage to the wiring of the cable.
Do not wipe the instrument with a volatile solvent.
Use neutral solvents and simple cleaners to clean the instrument with a soft cloth.
Regularly check the head of the probe for contamination.
Impurities (such as dust) on the blades and/or thermal sensor may affect the
accuracy of the instrument.
NOTE: If the vane assembly head or probe head requires cleaning we
recommend a fine mist of isopropyl alcohol and a fine long-haired brush or send
the unit in or servicing.

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INTRODUCTION
The AT400 and TAT420 air velocity transmitters supply
accurate air velocity and (TAT420) temperature data from a
building or process airflow on a continuous basis to a computer,
chart recorder, printer, and meter or control circuit.
Every instrument has terminals for both DC and AC power, and
0-1V, 0-5V and 4-20mA outputs. The outputs are concurrent and
can accept multiple wires (depending on the gauge used).
The heavy, all metal (except for the electronics pod) air probes
can be used for airstreams that have a wide range of humidity,
temperature and contaminants without compromising accuracy.
At the time of receipt, if more than 4 months has elapsed since
the date of the original calibration, Miltronics will provide an
initial complimentary calibration at the customer's request. If
you elect to utilize this service, please include a copy of your
dated proof of purchase and a copy of the original calibration
certificate included with your unit. Call 603-352-0187 and
request a Service/Repair (SR) number prior to shipping your
unit. Shipping is not included.

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SPECIFICATIONS
Sensors:
Air Velocity sensor: Metal rotating vane 1” or 2 ¾”
Temperature (TAT420): PT100 RTD
Range:
Air Velocity: 1” Probe: 300-6890 FPM (1.5-35 MPS)
2 ¾” Probe: 50-7800 FPM (0.2-40 MPS)
Temperature (TAT420): -4˚to 176˚F (-20˚to 80˚C)
Accuracy:
Air Velocity Probes:
2 ¾” Probe: ±1%+1 digit
1” Probe: ±0.5% full scale +0.75% reading + 1 digit
Temperature Probe: ±1.0˚C (TAT420)
Transmitter Air Velocity: ± 0.02 mA
Transmitter Temperature: ± 0.10 mA (TAT420)
Response Time:
Air Velocity: 2 second average and update
Temperature (TAT420): Approximately 60 seconds
Analog Outputs (separate and concurrent):
Air Velocity:
0-1V, 0-5V and 4-20mA represent 0-6800FPM (0-35MPS) for
the 1” probe and 0-7800FPM (0-40MPS) for the 2 ¾”
probe
Temperature (TAT420):
0-1V, 0-5V and 4-20mA represent -4 to 176˚F (-20˚to 80˚C)
Operating Range: -4˚to 176˚F (transmitter)
-22˚to 212˚F (probe heads)
Power Supplies: 120 or 220VAC, 50-60Hz, also
10-30VDC

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Input Current (with all options):
10-30VDC: AT400: 22mA, TAT420: 43mA
110VAC: AT400: 19mA, TAT420: 21mA
220VAC: AT400: 10mA, TAT420: 11mA
Output Impedance (0-1V and 0-5V outputs):
1KΩ
Enclosure:
ABS plastic, NEMA Class 4,
IP rating 66 (with connector & cord grips installed)
Dimensions:
Housing: 4.8” x 4.8” x 2.2”
Probe: 1” or 2 ¾” diameters
Weight: 18 ounces
Options:
Custom cable lengths: For probe cables1
Included:
•(1) TAT420 Instrument
•(1) Vane-type probe head, choice of APT100 or
APT275
•(1) Probe connection cable, 5 ft. for APT275
NOTE: If a longer cable is ordered, the 5ft. is not included.
•(1) TAT420 operation manual
•Certificate of Calibration with Data

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Dimensions
APT275 PROBE
APT100 PROBE

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INSTALLATION AND SETUP FOR AT400, TAT420
MOUNTING THE TRANSMITTER
Mount transmitter on a secure surface. The recommended
screw size is a #8 x ¾” (or longer) tapping screw.
Note: Make all connections with Power Off. Remove cover to
attach Transmitter to mounting area and to attach
power and signal cables. Attach in location free of
physical dangers such as excessive heat or continuous
condensing moisture.2
Note: On the AT400, terminals 1-3 are not be installed.
Note: Terminals 13-15 are not installed on any transmitter.
TERMINAL CONNECTIONS
1. 4-20 mA temp 9. 220 VAC
2. 0-1 Volt temp TAT420 10. 110 VAC
3. 0-5 Volt temp 11. 220/110 VAC
4. 4-20 mA air velocity 12. No Connection
5. 0-5 Volt air velocity 13. Not Installed
6. 0-1 Volt air velocity 14. Not Installed
7. Ground 15. Not Installed
8. V+ (10-30 VDC)

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POWER HOOKUP*
WARNING: Use extreme caution when handling power wires.
Make sure the wires are disconnected from the source.
1a) 110VAC power: hook white (neutral) wire into slot 10.
Then hook black (hot) wire into slot 11.
1b) 220VAC power: hook either hot wire into slot 11. Then
hook the other hot wire into slot 9.
1c) 10-30VDC: first hook ground wire into slot 7. Then hook
V+ wire into slot 8.
AIR VELOCITY OUTPUT*
2a) 0-1V F/S output: hook output ground reference to slot 7.
Then hook the air velocity output wire to slot 6.
2b) 0-5V F/S output: hook output ground reference to slot 7.
Then hook the air velocity output wire to slot 5.
2c) 4-20mA F/S output: hook output ground reference to slot 7.
Then hook the air velocity wire to slot 4.
TEMPERATURE OUTPUT (TAT420)*
3a) 0-1V F/S output: hook output ground reference to slot 7.
Then hook temperature output wire to slot 3.
3b) 0-5V F/S output: hook output ground reference to slot 7.
Then hook temperature output wire to slot 2.
3c) 4-20mA F/S output: hook output ground reference to slot 7.
Then hook temperature output wire to slot 1.
MOUNTING THE PROBE
Mount the probe in the air stream to be measured. A common
3/8” by 16-tpi threaded rod or bolt can be used to mount the
probe to a fixture. Connect the air probe to the unit via the
connector on the top of the case.

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METRIC OR ENGLISH UNITS
Shown on the diagram but no longer available
REPLACING COVER
Use care not to damage the seal or over-tighten.
DISPLAY SWITCH
Shown on the diagram but no longer available

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*NOTE: Be sure to tighten screws above slots when finished.
Diagram 1: Location and Polarity of Connectors and
Switches.
Air velocity
Connector
Display
Connector
1
2
3
5
4.330”
11 cm
3.515”
8.93 cm
Calibration
Jumper J1
6
4
Temperature
Connections:
TAT-420 only

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APPENDIX A – No Longer Available
APPENDIX B – No Longer Available
_____________________________
1In order to insure the proper calibration, all custom-length cables
for air probes with temperature sensors must be ordered at the time
the transmitter is purchased; or the unit must be returned for
calibration.
2Cable grips will seal on single, round cables from 2.5 to 6.5mm
diameter. For wire bundles, if you wish to insure water tightness,
use RTV silicon or other sealant safe for electronics at end of cable
grip.
Notes:

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USA
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Copyright ©2019, Miltronics Mfg., Inc.
Miltronics, Pacer Instruments, AT400, TAT420, THT500, the
Miltronics Mfg., Inc. logo and the Pacer Instruments logo
are trademarks of Miltronics Mfg., Inc.