micro-trak MT-NH3 II User manual

NH3
SPECIFIC
REFERENCE
MANUAL
MT-NH3TM II
NH3 AUTOMATIC RATE CONTROL

2
MT-NH3TM II
NH3 AUTOMATIC RATE CONTROL
REFERENCE MANUAL
The MT-NH3TM II is an electronic monitoring and controlling system that can help you achieve maximum yields and operate
more cost-eectively by providing the information you need to maintain proper application rates of Anhydrous Ammonia.
The MT-NH3TM II has been designed for easy installation and operation. However, since each installation will vary depending
on your equipment, please take time to familiarize yourself with this manual and the actual components before beginning.
Following the procedures described in this manual will ensure proper performance and help avoid problems or questions
once you are in the eld.
This manual is written for the MT-NH3TM II for NH3 application, which may be used for either English or Metric measurement.
Please read the manual carefully and follow the instructions as they apply to your usage.
If you do encounter a problem that cannot be corrected by reviewing this manual, consult your dealer or distributor, or con-
tact a Micro-Trak technician for assistance.
Toll Free in U.S. or Canada: [phone] or [phone]
Fax: [phone]
[email protected]
www.micro-trak.com
P.O. Box 99
111 LeRay Avenue
Eagle Lake, MN 56024
Copyright © 2017
Micro-Trak Systems, Inc.
Printed in the USA

3
Micro-Trak®Warranty
Micro-Trak (herein “Seller”) warrants to the original purchaser (herein“Buyer”) that, if any product or part of the product
(herein “part”) proves to be defective in material or workmanship, upon inspection and examination by Seller, within one (1)
year from the original date-of-purchase, and is returned to Seller with dated proof-of-purchase, transportation prepaid, within
thirty (30) days after such defect is discovered, Seller will, at their option and sole discretion, either repair or replace said part,
except that the warranty for expendable parts, including but not limited to, light bulbs and batteries shall be thirty (30) days
from the original date-of-purchase. Said warranty is valid only when the part has been installed, operated and maintained
in strict accordance with the procedures outlined in the manual. Any damage or failure to said part resulting from abuse,
misuse, neglect, accidental or improper installation or maintenance, unauthorized modication, use with other products or
attributable to acts of God, as determined solely by the Seller, will invalidate the warranty. Said part will not be considered
defective if it substantially fullls the performance specication. Buyer shall be responsible for all maintenance services, if any,
all in strict accordance with the procedures outlined in the manual. The warranty does not include labor, installation, replace-
ment parts or repairs, delivery of replacement parts or repairs or time and travel. Said warranty is non-transferable.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES OF MERCHANTABILITY, FITNESS FOR
PURPOSE AND OF ANY OTHER TYPE, WHETHER EXPRESS OR IMPLIED. The Seller’s liability, whether in contract, in tort, under
any warranty, in negligence or otherwise, shall not exceed the return of the amount of the purchase price paid by the Buyer,
and under no circumstance shall the Seller be liable for special, indirect or consequential damages. Seller neither assumes nor
authorizes anyone to assume for it any other obligation or liability in connection with said part. No action, regardless of form,
arising out of the transactions under this agreement may be brought by the Buyer more than one (1) year after the cause of
action has occurred.
Seller agrees to extend the term of the foregoing warranty period should the Buyer return completed warranty registration
information, with dated proof-of-purchase, to the Seller within one (1) year from the original date-of-purchase. All conditions
and limitations of said foregoing warranty, except the term of said foregoing warranty, shall apply. Said term shall be extend-
ed to a total of three (3) years from the original date-of purchase on display consoles and network communication modules,
as dened by Seller, and said term shall be extended to a total of two (2) years from the original date-of-purchase on all other
parts, except that the warranty for expendable parts, including but not limited to, light bulbs and batteries shall be thirty (30)
days from the original date-of-purchase, and except that the warranty for parts manufactured by someone other than the
Seller, including but not limited to, shuto and control valves, DGPS receivers, memory cards and drives, mapping software,
owmeters and pressure sensors shall be one (1) year from the original date-of-purchase.
Units under warranty should be sent prepaid, with dated proof-of-purchase, within 30 days of discovering defect, to the ad-
dress below:
MAIL and UPS:
Micro-Trak Systems, Inc.
ATTN: Service Department
PO Box 99 •111 East LeRay Avenue
Eagle Lake, MN 56024
At Micro-Trak Systems, we believe a product that delivers quality and performance at a low cost is what is needed to help
today’s operator and the operator of the future compete in the world market.
It is our goal to provide operators with a line of electronic equipment that will help build and maintain an ecient and prot-
able operation that can be passed on to future generations.
We thank you for your purchase and hope that we can be of service to you in the future.
Micro-Trak Systems, Inc.
Extended Warranty Option
It’s simple! Just complete the registration for this product ONLINE at www.micro-trak.com
and we’ll extend your warranty for up to three years*, at no additional charge.
Registration information is for internal use only.
* Some limitations apply. See warranty statement for details.

4
Table of Contents
Basic Overview of Typical Installation..............................................................5
MT-NH3™ II System Layout ...................................................................................6
Component Parts and Assembly Hardware ...................................................7
Installation.................................................................................................................9
Mounting the Display Console ...............................................................................................9
Power Connection.....................................................................................................................10
Harness Connections................................................................................................................10
Magnetic Speed Sensor Installation ...................................................................................11
Speed Sensor Options..............................................................................................................12
Liquier Kit Installation............................................................................................................13
Liquifier™ - Vapor Line Installation ......................................................................................14
MT-NH3TM II Console Functions.........................................................................15
Calibration ...............................................................................................................16
“Special” Calibration ............................................................................................20
Console Operation ................................................................................................22
Console Switches and Buttons..............................................................................................22
Field Operation...........................................................................................................................23
Resetting System Counters ....................................................................................................24
Clearing Counters......................................................................................................................25
Troubleshooting ....................................................................................................26
Messages/Warnings..................................................................................................................26
General ..........................................................................................................................................27
Checking Individual Components.......................................................................................28
Checking Individual Inputs ....................................................................................................29
MT-NH3TM II - NH3 Specic Wiring Diagram .................................................30
Appendices..............................................................................................................31
Appendix A - Speed Sensor Mounting Installation ................................................32
Appendix B - Fine Tuning Speed/Distance Calibration Value .............................33
Appendix C - Fine Tuning Flowmeter Calibration....................................................34
Appendix D - Flowmeter Assembly (FM-750 N).......................................................35
Appendix E - Flowmeter Assembly (FM-1500 N) .....................................................36
Appendix F - Radar Adapter Cables..............................................................................37
Appendix G - Replacement Parts List...........................................................................38

5
Basic Overview of Typical Installation
GPS Speed Sensor
(Other options available)
Battery
NH3
Nurse
Tank
Liquier™ Series
Heat Exchanger
Main Harness
Hitch Connection
MT-NH3 II
Console
Rear Speed Connection

6
MT-NH3™ II System Layout

7
Component Parts and Assembly Hardware
Before beginning installation, check the carton contents for the following items:
(2)
(2)
(2)
(2)
(2)
(2)
(2)
MT-NH3TM II Console
P/N 14956
Vacuum & Console Mount Kits
P/Ns 17858 & 13181
Reference Manual
P/N 14955
Power & Switch Harness
P/N 18767
NH3
SPECIFIC
REFERENCE
MANUAL
MT-NH3TM II
NH3 AUTOMATIC RATE CONTROL
Run/Hold Switch Kit
P/N 21963
Power Switch Kit
P/N 21779
14” Nylon cable ties (10)
P/N 12910
15’ Battery Cable with Fuse Holder &
Ring Terminals P/N 14315
NH3 Harness
P/N 13273
10’ 10-pin M/P ext. cable
P/N 13221
15’ 10-pin M/P ext. cable
P/N 13222

8
Component Parts and Assembly Hardware (cont.)
Liquier™ Junior Kit
P/N 01816
Liquifier™ Kit
P/N 01817
Liquifier™ MAX Kit
P/N 01818
Liquifier™ Ultra Low Rate Kit
P/N 01815
2800 lbs. NH3/hr.
11 GPM(@100 PSI)
6000 lbs. NH3/hr.
23 GPM(@100 PSI)
12000 lbs. NH3/hr.
40 GPM(@100 PSI)
21000 lbs. NH3/hr.
70 GPM(@100 PSI)
Liquifier™ Series Heat Exchangers available from Micro-Trak

9
Suction Cup Mount
1. To install the “U”
Bracket on top of the
suction cup, match
the center hole to the
corresponding stud
on the suction cup,
and fasten with the
provided lock nut.
2. Make sure the plate is
positioned so that the
suction push button
is free to operate. See
Illustration 2.
3. After selecting the best possible installation location,
prepare the area for the suction cup mount. The area
should be clean and completely dry. Place the suction
cup firmly against the mounting surface and press the
suction push button repeatedly until the red line is no
longer visible.
4. Mount the console into the console bracket - refer to
standard mount instructions at left and illustration 1.
NOTE: The suction cup mount will adhere to a clean, non-
porous, at surface - glass or at metal work very well.
(2)
(2)
(2)
(2)
(2)
(2)
(2)
Illustration 2
Illustration 1
Installation
Mounting the Display Console
Mount Knob
Carriage Bolts
Rubber Washer
Rubber Washer
Mount Knob
Switch Bracket
Switch Bracket
Mark and drill ¼” (7mm)
holes for bolts, or 3/16“ (5mm)
holes for hex screws.
(Both fastener types are included)
Select a mounting location which seems most workable,
and best fits your needs. It should be convenient to reach
and highly visible to the operator.
DO NOT INSTALL IN A POSITION THAT OBSTRUCTS THE
VIEW OF THE ROAD OR WORK AREA.
Whenever possible, avoid locations that expose the console
to direct sunlight, high temperature, strong chemicals or
rain.
See Illustration 1 below for installation detail.
1. Place the console bracket in the selected location, mark
holes, drill ¼” (7mm) holes to use bolts or 3/16” (5mm)
for hex screws. Mount bracket with included fasteners
(both bolts and hex screws are included in kit).
2. Place rubber washers on carriage bolts and insert the
bolts through the bracket holes from the inside out.
Slide console over carriage bolt heads.
3. Slide the switch brackets over the carriage bolts and
alongside the console bracket. The power On/Off
switch (Kit 21779) mounts on the left side and the Run/
Hold switch (Kit 21963) mounts on the right. Install
the mount knobs on the carriage bolts and tighten to
secure the console and switch brackets in place.
4. Join the switch connectors to the labeled mating
connectors on the power and switch harness (P/N
18767).

10
Installation (cont.)
Power Connection
The MT-NH3TM II must be connected to a 12-volt DC electrical
system. Power is connected directly to the battery. The MT-
NH3TM II has an ON/OFF switch on the mounting bracket to
turn the power o when the system is not being used.
Locate the power cable (P/N 14315), connect it to the power
connection on the Power & Switch Harness (P/N 18767), and
route it to the battery. Connect the Orange wire (hot) to the
positive battery terminal. Attach the Blue wire (ground) to a
screw or bolt on the equipment frame. See Illustration 3. Be
sure there is a good metal-to-metal contact. You may wish
to substitute other types of connectors. In routing cable to
battery, avoid areas where the cable may be subjected to
abrasion or excessive heat.
Your MT-NH3TM II is equipped with a non-volatile electronic
memory which does not require a constant supply of power
to retain daily totals or calibration values. The advantage
with this type of memory is that it conserves battery power
and will not discharge the vehicle’s battery when equipment
is not in use.
WARNING: Follow accepted safety precautions when
working on electrical systems. Always disconnect battery
ground cable rst and re-connect last.
Hot
(Orange)
Ground
(Blue)
NOTE: For negative ground systems ONLY
Illustration 3
Harness Connections
The MT-NH3TM II main wiring harness is made specically
for use on anhydrous ammonia applicators. The harness
combines the wires for the control servo valve, owmeter,
shut-o valve and remote access speed connector into a
single 10-pin connector.
Plug the console 10-pin connector into the 10-pin
connector on the plumbing unit harness. Optional extension
cables are available. Remote run/hold is not available on the
NH3 systems.
NH3 Kit Main Harness
P/N 13273
Remote Run/Hold IS NOT
Available on the NH3 Systems
FLOW
SPEED
CONTROL
SERVO
NH3 SHUTOFF
VALVE
CONNECT HARNESS TO LIQUIFIER™:
1. Join the FLOW connection to the flowmeter.
2. Join the CONTROL connection to the Servo Valve.
3. Join the NH3 SHUTOFF connection to the On/Off valve.
4. Connect the harness to the MT-NH3 console using
the 10-pin extension cables (P/N 13221 & 13222).

11
Installation (cont.)
Magnets
Please read the following information about magnet
spacing and polarity.
The number of magnets that must be used depends on the
size of your tire and where you mount the sensor. On trac-
tor or implement wheels the general rule of thumb is one
magnet for each wheel bolt (minimum of two, and always
an even number). For drive shafts or small wheels (ATV’s),
two magnets are usually adequate.
Some installations may require that more than two magnets
be installed. To determine the number of magnets required,
measure the distance traveled of one revolution of the sen-
sor equipped wheel in inches (centimeters).
See the following tables to nd the minimum number of
magnets required (always an even number)
The magnets provided by Micro-Trak are marked with a
punched dashed line on the SOUTH pole side of the magnet.
See Illustration 4.
Always use an even number of magnets, and always alter-
nate the polarities of the magnets as you go around the
wheel hub or drive shaft.
To install, mount the rst magnet with the SOUTH pole side
(dashed line) facing toward the hub or shaft. Mount the
second magnet with the NORTH pole side facing toward the
hub or shaft. See Illustration 5.
For proper operation, the magnets must be evenly spaced
around the wheel or drive shaft. The magnets must be at
least 1" apart. See Illustration 6.
NOTE: Magnets may be attached mechanically or adhered
with epoxy or other high quality adhesive. When using
adhesive, thoroughly clean the area of dirt and oil.
S
N
Illustration 4
North
North
North
South
South
South
1
2
43
5
6
Test magnet
should alternately
attract and repel.
Illustration 5
1” Minimum
Illustration 6
English or Turf (inches)
Wheel Circumference 40 80 120 160 200
Number of Magnets 2 4 6 8 10
Metric (cm)
Wheel Circumference 100 200 300 400 500
Number of Magnets 2 4 6 8 10
Magnetic Speed Sensor Installation
Please Note: If you have purchased an Astro GPS speed
sensor or a Vansco radar or other speed sensing device,
disregard the section on magnetic speed sensors and in-
stall the optional speed sensor as described in the instruc-
tion packed with the unit.
Locations where the magnetic sensor may be installed:
1. Non-driven wheel on tractor, vehicle or implement. This
is less susceptible to errors resulting from wheel slip.
2. Tractor, vehicle or planter drive shaft. This type of
mounting is recommended for trucks, four-wheel drive
tractors or other equipment that has poor or no access
to a non-driven wheel.
Hall-eect Speed/Flow Sensor
Cable - P/N 13096
15’ 3-pin M/P 150 Extension
Cable - P/N 13207
14” Nylon Cable ties (10)
P/N 12910
Magnets (6)
P/N 12069
(2 in Hardware
Bag)
Hardware
Bag
P/N 13251
Speed Sensor
Mounting
Bracket
P/N 10013

12
Installation (cont.)
Magnetic Speed Sensor Installation (cont.)
Connecting the Speed Sensor Cable
The magnetic speed sensor cable has a GREEN sensor body
and mates with the main harness cable labelled SPEED.
Make certain that you install the correct sensor cable and
connect it to the correct connector on the main harness. The
speed sensor connector is identical the ow sensor connec-
tor and could accidentally be connected to the ow sensor
input of the main harness cable. The speed sensor always
connects to the main harness lead labelled SPEED and ow
sensor always connects to the main harness lead labelled
FLOW.
INSTALLATION NOTE:
The main harness provides two connection points for the
speed sensor. For speed sensor installations in the cab or
near the control console, it may be more practical to use
the local access connector on the control console pigtail
exiting the rear of the console. Using this connection point
will disable the connection point on the end of the main
harness. For speed sensor installations on implements,
it may be more practical to use the speed connector on
the end of the main harness. When using this connection
point, make certain that the local access connector for
speed/distance is mated together.
Speed Sensor Options
In addition to the Hall-eect magnetic speed sensor, the
MT-NH3TM II may be interfaced with a variety of other speed
sensing equipment. Several options are listed below.
Astro GPS Speed Sensor
The Astro is an easy-to-install economical alternate to radar
speed sensors. The Astro is available with either a 1 HZ or 5
HZ GPS receiver. The sensor converts GPS signals to a pulsed
speed signal, providing an accurate speed input in all eld
conditions.
Vansco™ Radar Speed Sensor
The Vansco radar speed sensor uses a microwave (radar)
signal to deliver a reliable, accurate speed signal for electronic
equipment. It features state-of-the-art electronic design/
manufacturing, rugged aluminum housing and complete
testing and certication.
Radar Interface
The MT-NH3TM II may also be interfaced with most popular
radar ground speed sensors. An adapter cable is required for
proper interface.
GPS Speed Sensor Interface
The MT-NH3TM II may also be used with most other GPS
speed sensors that output a pulsed signal, such as SkyTrak
or Dickey-John GPS speed sensors. An adapter cable may be
required.
SEE APPENDIX F FOR LIST OF ADAPTER CABLES FOR RADAR.
Contact a Micro-Trak sales representative for
details on any of these products, or
call Micro-Trak Systems, Inc. at 1-800-328-9613.
Astro GPS
Speed Sensor
Attaching the Magnetic Speed Sensor
The magnets are attached to a wheel hub or drive shaft
and the speed sensor should be mounted directly over
the magnet. When the wheel or drive shaft begins turning,
a speed impulse is sent to the MT-NH3TM II console every
time a magnet passes by the tip of the speed sensor. For
the speed sensor to operate properly, the spacing between
the magnets and the tip of the sensor must always remain
constant. Before permanently mounting any parts, be
sure that the location you have selected will meet the
requirements shown in Illustration 7.
NOTE: Observe magnet polarities (see previous section).
See Appendix A for additional magnetic speed sensor
mounting options.
Illustration 7
45° max
Sensor
(Green body)
Magnet
3/8” nuts
Bracket must
be rigidly
mounted
Sensor assembly must not
be mounted more than
45° from perpendicular
¼” to ½” air gap

13
STRAINER
BODY
SCREEN O-RING
PL
UG
CAP
MAGNETIC
CORE
Installation (cont.)
Liquier Kit Installation
Illustration 8
Detail of Strainer Assembly
LIQUIFIER KIT INSTALLATION - See Illustration 8
Remove any existing metering valves. If the old metering valve has a built-in manifold, it is recommended to install a
separate new manifold for the Liquifier™ kit. Another option, although not recommended, is to use the existing manifold,
making certain the old metering valve is in the maximum open position to allow for minimal restriction of flow through the
plumbing. There should not be any positive shut-off valves installed in the plumbing between the Liquifier kit shut-off valve
and the knives.
Install the plumbing panel on the tool bar frame using the carriage bolts and flange lock nuts through the top and bottom
brackets of the system. Trim any excess length off the bolts if required. Attach the hose from the breakaway coupler to the
strainer inlet. Check for proper hose length for operation of the disconnect mechanism of the breakaway coupler. Connect
the manifold hose to the servo valve outlet. Check for proper hose length to avoid kinking at the hinge points.
SERVO VALVE
ON/OFF VALVE
FLOWMETER
VAPOR OUTLETS
HEAT EXCHANGER
TUBING
STRAINER
MOUNT BRACKET
HOSE BARB
w/ORIFICE
INSTALLATION NOTE: It is recommended to use an NH3 compatible
thread sealing compound on all pipe thread fittings.

14
Locate the 1/2” EVA vapor hose supplied with the kit.
Starting on one half of the tool bar, connect the 1/2” hose
to the outside steel vapor tube. Route the hose up the
shank and along the tool bar frame to the inside steel
vapor tube. Allow enough extra hose to avoid kinking at
hinge points. Cut the hose to length and attach to the
inside steel vapor tube. Install a 1/2” x 3/4” x 1/2” tee fitting
approximately halfway along this hose between the outside
and inside steel vapor tubes. See Illustration 9 below.
Repeat the same procedure for the steel vapor tubes on
the other half of the tool bar. Secure all hoses with properly
sized hose clamps. Secure the hoses to the tool bar frame
with cable ties.
Locate the 3/4” EVA hose supplied with the kit. Connect
to one of the 1/2” x 3/4” x 1/2” tee fittings and route along
the tool bar frame to other 1/2” x 3/4” x 1/2” tee fitting. Cut
to length and install on the tee fitting. Allow enough extra
hose to avoid kinking at hinge points. Now install a 3/4”
x 3/4” x 3/4” tee fitting approximately halfway along this
hose (center of the tool bar) between the other two tee
fittings. Using an appropriate length 3/4” hose, connect this
tee fitting to the vapor tube connection on the Liquifer™
plumbing panel. Secure all hoses with properly sized hose
clamps. Secure the hoses to the tool bar frame with cable
ties.
Liquifier™ - Vapor Line Installation
FOR ALL NH3 KITS
Weld the steel vapor tubes to the back of your liquid
tubes. All electronic equipment, including the console and
radar speed sensor, MUST BE DISCONNECTED BEFORE
WELDING ON EQUIPMENT. The four steel vapor tubes
should be evenly spaced across the applicator (two per
side) and installed so that only their wear resistant surface
contacts the soil. Mount the tubes just high enough to
avoid plugging. See Illustration 10 below.
VAPOR TUBES
WEAR RESISTANT
SURFACE
GROUND LEVE
L
½”Vapor Hose
Liquier™
Heat Exchanger
Steel Vapor Tubes
½”Vapor Hose
Vapor Outlet
½”Vapor Hose
½”Vapor Hose
¾”Vapor Hose
½” X ¾” X ½”Tee½” X ¾” X ½”Tee
Steel Vapor Tubes
¾”Vapor Hose
Vapor Outlet
Installation (cont.)
llustration 10
llustration 9

15
Care and Maintenance
of your MT-NH3TM II
Console
• Store the console in a cool dry location if it will not
be used for an extended period of time, such as dur-
ing the o-season.
• As with any electronic equipment, use care in clean-
ing so that water or other liquids do not enter the
case.
• Filter Cleaning: remove strainer cap and clean lter
and magnet at regular intervals.
Precautions
• When using N-Serve and/or ACA, it is recommended
that the last tank used for the season be free of these
additives to ush the plumbing clean.
MT-NH3TM II Console Functions
The MT-NH3TM II features a large, easy-to-read liquid crystal display, and lighted panel for night use.
TOTAL NH3 (1) (2) (3): Displays total lbs. (kg) of NH3 ap-
plied. (NOTE: TOTAL NH3 and AREA counters work in pairs; if
TOTAL NH3 counter 1 is reset, it also resets AREA counter 1.)
NH3 PER MINUTE: Displays total lbs.
(kg) of NH3 applied per minute. TANK
(NH3): Displays lbs. (kg) of NH3 re-
maining.
RATE ACTUAL “N”: Displays
pounds (kg) of actual “N” ap-
plied per acre (hectare).
FLOW CAL: Used in calibration
mode to enter the calibration
value assigned to your owmeter
(see owmeter tag).
MIN FLOW: Used in calibration
mode to enter the minimum ow
rate (lbs./kgs.) per minute.
TARGET RATE: Used in calibration mode to enter the target
application rate of pounds (kg) of actual “N” applied per acre
(hectare).
ADJUST RATE: Used in calibration
mode to enter an amount of change
for on-the-go adjustment to the
target rate of lbs./acre (kg/hec) "N".
AREA (1) (2) (3): Keeps a running count of the total acres
(hectares) worked. May be reset. (NOTE: TOTAL NH3 and
AREA counters work in pairs, if AREA counter 1 is reset, it also
resets TOTAL NH3 counter 1.)
AREA/HOUR: Displays cur-
rent work rate in acres per
hour (hectares per hour).
WIDTH CAL: Used in calibra-
tion mode to enter the working
width of your tool bar.
SPEED: Displays ground
speed in miles per hour
(kilometers per hour).
SPEED CAL: Used in calibration
mode to enter the speed cali-
bration number in inches (cm)
per pulse.
NOTE: To learn more about each of the calibration func-
tions listed on this page, refer to the“Entering Calibration
Values (pages 17-18) and “Console Operation”(pages 22-23).
TANK (NH3): Displays lbs.
(kg) of NH3 remaining.
Calibration Positions Calibration Positions
DISTANCE: Displays distance traveled
in feet (meters). May be reset.
WARNING LIGHT: Indicates over or
under application of 10% from the
Target Rate. Also lit when in CAL.
AUTO/MAN: Key which
changes operation from
automatic to manual
control mode.
CAL: This key is used to
enter and exit the
calibration mode.
PROGRAM KEYS: Used
to calibrate the system.
• RESET clears the
counters when not
in CAL and held for
three seconds.
• The “+” key increases
the gure displayed
in the readout, while
“-” decreases it when
in CAL.
Key Functions:
RESET
AUTO
MANCAL

16
Illustration 11
Calibration
English or Metric?
Illustration 12
The MT-NH3TM II is capable of displaying information in
American English or standard Metric measurement. The
MT-NH3TM II is shipped from the factory programmed for
English. Note that the following procedures will also load
factory default calibration values. To simply change units
without loading defaults, see the "Special Calibration"
section.
ENGLISH:
To activate the English mode, turn power OFF and place the
rotary switch at "TOTAL NH3". Hold down both the "CAL"and
"-" keys and turn power ON. The console will display "Load".
Release the two keys. See Illustration 11. To "lock-in" English
mode you must enter and exit calibration. Press and hold
the CAL key until "CAL" icon turns on. The console is now in
calibration. Exit CAL by pressing and holding the CAL key
until the "CAL" icon disappears from the display. English
units are now locked in.
METRIC
To activate the Metric mode, turn power OFF and place the
rotary switch at "AREA". Hold down both the "CAL" and "-"
keys and turn power ON. The console will display "LOAd".
Release the two keys. See Illustration 11. To "lock-in" Metric
mode you must enter and exit calibration. Press and hold
the CAL key until "CAL" icon lights on the display. The console
is now in calibration. Exit CAL by pressing and holding the CAL
key until "CAL" icon disappears from the display (approxi-
mately 3 seconds). Metric units are now locked in.
NOTE: In metric, the width will have a decimal point, in
English there is no decimal point. Also, changing from
English to Metric mode may change or alter any
previously entered calibration values. After switch-
ing measurement modes, conrm that all calibration
values are correct.
IN ALL CALIBRATION OPERATIONS
To enter or change any of the system’s calibration values,
you must enter calibration mode. To enter calibration mode,
STOP the vehicle, place the Run/Hold Switch into Hold and
press and hold the CAL button until“CAL” lights up (approxi-
mately one second). See Illustration 12.
(NOTE: Calibration may be entered while moving, but it is
not recommended to attempt calibration while the vehicle
is moving.) The console will remain in calibration mode,
with the RED warning light illuminated until you exit calibra-
tion or turn power OFF.
Once in calibration mode, you may change any one, all or
none of the values, in any order. To select a calibration
position, simply turn the rotary selector to the desired posi-
tion. Calibration positions are identied in white type on
each side of the rotary selector. All values are entered and
adjusted using the “+” and “-” buttons on the front panel.
To save new values, you must exit CAL mode (by pressing
the CAL button until the CAL icon turns o ) prior to turning
power o.
MT-NH3 II
™
AUTO
MAN
CAL
RESET
RATE
ACTUAL “N”
TOTAL NH3
(1) (2) (3)
AREA
(1) (2) (3)
NH3 PER
MINUTE
TANK (NH3)
DISTANCE
AREA/
HOUR
SPEED
FLOW
CAL
MIN
FLOW
ADJUST
RATE
TARGET
RATE
WIDTH
CAL
SPEED
CAL
Run/Hold Switch in
HOLD position
MT-NH3 II
™
AUTO
MAN
CAL
RESET
RATE
ACTUAL “N”
TOTAL NH3
(1) (2) (3)
AREA
(1) (2) (3)
NH3 PER
MINUTE
TANK (NH3)
DISTANCE
AREA/
HOUR
SPEED
FLOW
CAL
MIN
FLOW
ADJUST
RATE
TARGET
RATE
WIDTH
CAL
SPEED
CAL
CAL
Run/Hold Switch
in
HOLD position
Press to enter or exit
Calibration Mode.
Red warning light will
be lit when in CAL.
PRESS both and turn
power on to load Units
Press to increase or
decrease values.

17
Calibration (cont.)
Entering Calibration Values
FLOW CAL:This position is used to calibrate the flowmeter for
accurate NH3 mea-
surement. When this
position is selected,
the display will show the owmeter
calibration value and the "CAL" icon will be
displayed. The owmeter calibration value
is the number shown along with “CAL" and
“HOLD” on the display. Use the"+" and "-"
buttons to enter the number stamped on the
tag attached to the owmeter. Every NH3 type owmeter is
calibrated for “N” at the factory. However, the value should
be ne-tuned to ensure best accuracy in the system. Please
refer to Fine-Tuning Flowmeter Calibration in Appendix C.
MIN FLOW: The purpose of this calibration parameter is to
prevent the system from applying below the recommended
minimum rate for
the owmeter. Enter
a value of 10.0 lbs./
min. (5.0kg/min.) for this calibra-
tion parameter. Application note: In certain
situations, your ground speed may be slow
enough to result in over application. In other words, based
on ground speed, the actual ow rate has dropped to the
calibrated minimum ow rate.
ADJUST RATE: Enter the value for the desired amount of
change in pounds of actual “N” per acre (kg per hectare) to
be used for making on-the-go rate adjust-
ments when operating in AUTO. For example,
if a value “5.0”is
entered, you will be
able to increase and
decrease your appli-
cation rate in ve-pound (kg) increments during operation
in AUTO. To disable this feature, simply enter “.0” for a value.
TOTAL NH3
(1) (2) (3)
FLOW
CAL
NH3 PER
MINUTE
MIN
FLOW
TANK (NH3)
ADJUST
RATE
TARGET RATE: Enter the value for the desired target appli-
cation rate in pounds of actual “N” per acre (kg per hectare).
This is the application
rate that the control
console will lock onto
when operating in
AUTO.
RATE
ACTUAL “N”
TARGET
RATE
CAUTION: Nurse tank must NOT be connected during this
process below.
WIDTH CAL: Use the "+" and "-" buttons to enter the eec-
tive working width, in inches (meters) for the tool bar; See
“Working Width” on
the next page.
AREA
(1) (2) (3)
WIDTH
CAL
SPEED CAL: This position is used to calibrate the speed
sensor for accurate speed and distance measurement. When
this position is selected, the display will show the SPEED CAL
value. NOTE: The SPEED CAL value is in centimeters when
using metric units.
To ne-tune speed
calibration for optimal
accuracy, see Fine Tun-
ing Speed Calibration,
Appendix B.
DISTANCE
SPEED
CAL
FM750 N Flowmeter
P/N 10899
Micro-Trak liquid cal - 152
Micro-Trak NH3 cal - 34.9
Pulses per gallon - 76.0
Pulses per 10 gallons - 760
S/N 000000000
FM750 N Flowmeter
P/N 10899
Micro-Trak liquid cal - 152
Pulses per gallon - 76.0
Pulses per 10 gallons - 760
S/N 000000000

18
Illustration 13
Working Width
In order to accurately measure the number of pounds (kg)
of “N”applied per acre (hectare) it is important to determine
the correct “working”width. The “working”width is the width
of ground being aected by any operation. This should be
measured to the nearest inch (or cm).
For the console to calculate the correct number of acres
(hectares), both the circumference of the sensor-equipped
wheel and the implement width must be entered.
Determine the circumference of the sensor-mounted wheel
to the nearest hundredth of an inch (tenth of a centimeter)
with the following method:
METHOD
Mark tire with a piece of chalk and measure distance trav-
eled on the ground for one complete revolution. For ac-
curacy, measure the wheel revolution several times and take
the average. Divide that value by the number of magnets
installed on the wheel hub to get your starting SPEED CAL
calibration value. See Illustration 13.
To determine Speed Calibration number, measure the
distance of one complete wheel revolution and divide by
the number of magnets installed.
Calibration (cont.)
Determining Wheel Circumference
Working Width = Number of Knives X Spacing
Example:
Your rig has 13 knives spaced 30”apart.
10 knives X 30” = 390”

19
NOTE: If you have mounted the magnetic speed sensor on
a wheel, skip this step and go on to Fine Tuning Speed/
Distance
Calibration Values. If you are using a radar or GPS speed
sensor, see next section.
Because of the dierence in wheel-to-drive shaft ratios, it
is dicult to determine a calibration value for installation
on a drive shaft by measuring a wheel. You must start with
an estimated calibration value and then ne-tune the
calibration.
When using optional radar or GPS speed sensors, enter SPEED CAL numbers per the following table. See Appendix B for ne-tuning.
Calibration Factor Measurements Aected Default Values
English Metric
FLOW CALibration Flow/Application Rates, Totals 36.0 pulses/lb. N 36.0 pulses/lb. N
MINimum FLOW Lowest allowable ow rate 10 lbs. NH3/minute 5 kg. NH3/minute
ADJUST RATE Amount of increase or decrease per +/- press 10 lbs. N/Acre 10 kg. N/Hectare
TARGET RATE Application Rate 100 lbs. N/Acre 110 kg. N/hectare
WIDTH CAL Area, Application Rate 420 inches 10.00 meters
SPEED CAL Distance Measurement 1.750 inches 4.44 centimeters
Radars English Cal # in. Metric Cal # in. Hz/MPH
Vansco .150 .38 58.90
Raven .148 .38 59.80
Magnavox .154 .39 57.40
Dickey-john
(NOTE: Dickey-john
radars may be factory
calibrated for any of
these four settings).
.149 .38 58.94
.199 .50 44.21
.319 .81 27.64
.518 1.32 17.034
GPS Speed
Astro II & 5 .189 .48 46.56
SkyTrak 1.50 .38 58.94
Dickey-john .210 .53 42.00
John Deere (In-cab speed signal) .197 .50 44.70
1. Turn the master switch to the CONSOLE ON/VALVE OFF
(center) position.
2. Press and hold the “CAL” key for one second to enter the
calibration mode. Turn the dial to “SPEED CAL” position.
3. Use the “+” or “-” key to adjust the displayed value to any
number between 10 and 15 (25.5 cm to 38.0 cm). When
the number shown on the display matches the desired
value, you have arrived at the estimated calibration
value. Exit“CAL” by pressing and holding the “CAL” key
for three seconds.
NOTE: For ne-tuning the SPEED CAL value, turn to page 33.
Radar or GPS Speed Sensor Calibration
Factory-Loaded Calibration Values
Calibration (cont.)
Drive Shaft Speed Sensor Calibration

20
The “Special” Calibration mode is used to set up system
parameters that rarely need to be changed or adjusted.
To enter Special Cal, turn the console power OFF, press
and hold both the AUTO/MAN button and CAL button
while turning console ON. The console will display SPEC
for 2 seconds to show that the console is in the Special
Calibration mode. Release the AUTO/MAN and CAL buttons.
The CAL icon and Warn LED will turn on. The desired Special
Calibration parameter(s) can then be accessed with the
rotary switch per the illustration below. To exit Special
Calibration, press and hold the CAL button for 2 seconds.
The console will store any changes and revert to normal
operation. NOTE: you must exit Special Calibration to save
changes.
The following table describes the special cal parameters
and shows the factory settings. More detailed
descriptions follow the table.
Parameter Description Factory Setting
Units System of units: EnG (English) / mEt (Metric) /TurF (Turf) EnG (English)
Valve Voltage Servo Valve Drive Voltage (8/12) 12
Valve Response Speed Set Valve Response (-4 to 3) -1
Fill Tank Size Size (volume) of Full Tank (O or 1-65,535) O
Tank (Norm) Set Point Sets alarm point if using Tank Function (O or 1-65,535) O
Auto Shuto Runs servo toward minimum when in hold (On/O ) O
Auto Time Delay Delay servo response when going from Hold to Run (O to 4 sec.) 1
MT-NH3 II
™
AUTO
MAN
CAL
RESET
RATE
ACTUAL “N”
TOTAL NH3
(1) (2) (3)
AREA
(1) (2) (3)
NH3 PER
MINUTE
TANK (NH3)
DISTANCE
AREA/
HOUR
SPEED
FLOW
CAL
MIN
FLOW
ADJUST
RATE
TARGET
RATE
WIDTH
CAL
SPEED
CAL
Fill Tank Size
Tank Set Point
Valve Response Speed
Valve Voltage
Units
Auto Delay Time
Auto Shut-O On/O Not Used
Special
Calibration
“Special” Calibration
Entering “Special” Calibration Values