OWNER’S MANUAL
Digital Torque Wrench
NTW1
Contents
1. Main Features
2. Names and Functions of Parts
3. Specification
4. Before Using the Wrench
5. Setup
6.Track Mode Operation
7.Peak Hode Mode Operation
8. Maintenance and Storage
1
Dear Customers,
Thank you for purchasing our digital torque
wrench. This manual will help you to use the many
features of your new digital torque wrench. Before
operating the torque wrench, please read this
manual completely, and keep it nearby for future
reference.
MAIN FEATURES
◼ Adjustable Jaw 5-30 mm
◼ Digital torque value readout
◼ +/- 2% accuracy
◼ Clockwise and Counter Clockwise operation
◼ Peak hold and track mode selectable
◼ Buzzer and LED indicator for the 9 pre-settable
target torques
◼ Water contact indicator
◼ Engineering units (N-m, ft-lb, in-lb, kg-cm)
selectable
◼ 50 data memory for recall and joint torque auditing
◼ Auto Sleep after about 5 minutes without use
NAMES AND FUNCTIONS OF PARTS
1. Head Insert
2. Sensor Yoke
3. LCD Readout
4. Communication Port
5. Up/Down Button
6. Buzzer
7. Power on/Clear Button
8. Unit/Setting Button
9. Pre-setting Number
Selection Button
10. Anti-slip Handle
11. Opening Size Adjuster
12. Battery Cover
13. LED Indicator
14. Torque Value Readout
15. Units(N-m,ft-lb,in-
lb,kg-cm)
16. Pre-setting Number
17. Peak/Track Mode
18. Water Indicator Viewing
Window
2
SPECIFICATIONS
Model
No.
Torque
Measuring
Range
Jaw Size
Length
NTW1
4.2~85 N-m
5-30mm
12.8 in
325 mm
Accuracy *1
CW：±2%
CCW：±3%
Data memory size
50
Pre-Sets
9
Bright LED
6 LEDs
(1 Red+5 Green)
Operation Mode
Peak hold/Track
Unit Selection
N-m, in-lb, ft-lb, kg-cm
Head Type
Adjustable Jaw
Battery
AAA x 2
Operating Temperature
14℉-140℉ (-10℃-60℃)
Storage Temperature
4℉-158℉ (-20℃-70℃)
Humidity
Up to 90% non-condensing
Drop Test
3.28 ft (1 m)
Vibration Test *2
10G
Environmental test *3
Pass
Electromagnetic
compatibility test *4
Pass
Note:
*1: The accuracy of the readout is guaranteed from
20% to 100% of maximum range + /- 1 increment.
The torque accuracy is a typical value. Calibration
point is at the middle line of black circle area on
the rubber grip. For keeping the accuracy,
calibrate the wrench for a constant period time (1
year).
*2: Horizontal and vertical test.
*3: Environmental test:
a. Dry heat
b. Cold
c. Damp heat
d. Change of temperature
e. Impact (shock)
f. Vibration
g. Drop
*4: Electromagnetic compatibility test:
a. Electrostatic discharge immunity (ESD)
b. Radiated susceptibility
c. Radiated emission
3
BEFORE USING THE WRENCH
BATTERY INSTALLATION
◼ Remove the battery cap.
◼ Insert two AAA batteries matching the
-/+ polarities of the battery to the battery
compartment.
◼ Put on the battery cap and fasten it tightly.
ATTENTION:
When opening the battery cover of wrench, you
can see a viewing window for the water contact
indicator. Through this viewing window, you
can check if this wrench is damaged by water
penetration if the water contact indicator turns
red.
POWER ON AND RESETTING THE WRENCH
◼ Press to power on the digital torque wrench.
◼ Usually press to reset the digital torque
wrench before using it.
ATTENTION:
If an external force is applied to the torque
wrench during power-on/reset or wake up period,
an initial torque offset will exist in the memory.
ACTIVATION DURING SLEEP MODE
◼ The wrench will auto sleep after about 5 minutes
without use for power saving. Press to
wake up the wrench during the sleep mode.
RESETTING THE WRENCH
◼ If the wrench does not function normally,
Press together to reset the wrench.
LOW BATTERY VOLTAGE PROTECTION
◼ If the battery serial voltage is in low voltage
status, the wrench will display a battery symbol
and then turn off after a while.
4
WHEN CHANGING THE TYPE OF HEAD
◼ If you use the different head of the wrench, the
reading on the display will be different for the
different length of the head. Please refer to the
following explanation.
◼ Reference dimension for each model：
Model
L1(mm)
L3(mm)
NTW1
85.9
175
D : The set torque
D1: The actual torque applied to the nut.
L1: The normal length
L2: The extended length
L3: The length from the fitting pin to the
calibration point.
D = D1 * (L3+L1) / (L3+L2)
Calibration Point
5
SETUP
STEP 1: PRE-SETTING NO.
Note:
1. If is displayed, that means this wrench has ever
been applied more than 110% of torque of the spec.
2. The max number of Pre-Sets is 9.
3. The “Pre-setting No.” is cyclic.
*Note1, 2, 3
Pre-setting No.: M1
Press
Press
Pre-setting No.: M2
‧
‧
‧
4 2 1
3
Unit Selection/Setting
Pre-setting No.
Power On/Clear
Up/Down Button
Pre-setting No.: M2
Pre-setting No.: M9
6
STEP 2: UNIT SELECTION
STEP 3: SET TORQUE VALUE
Note:
1. The “Unit Selection” is cyclic.
Pre-setting Torque Value
Decrease Target Torque Value
Press
Press
Increase Target Torque Value
Pre-setting Unit: N-m
Press
Unit Selection: kg-cm
Unit Selection: in-lb
Unit Selection: ft-lb
Press
Press
7
STEP 4: PEAK HOLD /TRACK MODE
SELECTION
Note:
1. Please skip this procedure and continue to the next step.
Set Peak/Track mode
Press
Set Peak/Track mode
Record No.
*Note 1
Track Mode
Long Press
Peak Hold Mode
Clear Record
Press
*Note 1
Press for Selection
Press
8
TRACK MODE OPERATION
Buzzer
(((((((( )))))))) ((((((( )))))))
Apply Torque
Current Torque Value
Current Torque Value
*Note 1
START
(System initial)
((…((… …))…)) ((…((… …)) …))
Buzzer
Red LED
Approached Target Torque
Setting Target Torque
Green LED
Reach 80% of Target Torque
Reach Target Torque
Reach 80% of Target Torque
*Note 3
*Note 2
Note:
1. If is displayed, that means this wrench has applied
more than 110% of torque of the spec.
2. When 80% of the target torque is reached, the green LED will
begin to flash and the alarm tone will beep intermittently.
3. When the target torque is approached, the alarm will change to
a steady tone and the green LED will stop flashing and stay on.
The red LED will also illuminate.
9
PEAK HOLD MODE OPERATION
Red LED
Approached Target Torque
Buzzer
(((((((( )))))))) ((((((( )))))))
Reach Target Torque
Current Torque Value
(Peak Hold)
Apply Torque
((…((… …))…)) ((…((… …)) …))
Buzzer
Green LED
Reach 80% of Target Torque
Flashing
Apply Torque
Released
Setting Target Torque
Reach 80% of Target Torque
Recording
*Note 2
*Note 1
(System initial)
*Note 3
*Note 4
Note:
1. If is displayed, that means this wrench has ever been
applied more than 110% of torque of the spec.
2. If is displayed, that means the wrench’s memory is
full and the next value record can not be written in. Please refer
the “Peak Hold Mode Recorded Value Review” section to clear
the momory records.
3. When 80% of the target torque is reached, the green LED will
begin to flash and the alarm tone will beep intermittently.
4. When the target torque is approached, the alarm will change to a
steady tone and the green LED will stop flashing and stay on.
The red LED will also illuminate.
10
Peak Hold Mode Recorded Value Review
Note:
1. The “Peak Hold” mode recorded value review also can be
operated from “Track” mode operation.
2. If you operate in the “Peak Hold” mode, the display will
show please skip to next step.
3. If the record is empty, it will show .
4. This function is not supported on all models.
5. Communication mode is for uploading record data to PC.
6. Communication mode is also for calibration of torque wrench.
Please contact NAVAC technical support for more information.
Press
Peak Hold/Track Mode
Set Peak/Track Mode
Auto Change
Record No.
*Note 2
Record Value
Long Press
Press
Communication
*Note 3
*Note 1
Clear Record
Press
Peak Hold /Track Mode
No
(Give up)
*Note4, 5, 6
(Exit)
Communication
Deleted
(Clear)
Yes
Press
11
MAINTENANCE AND STORAGE
CAUTION:
1. Over-torque (110% of
Max. torque range) could
cause breakage or lose
accuracy.
2. Do not shake violently or
drop wrench.
3. Do not use this wrench as a hammer.
4. Do not leave this wrench in any place exposed to
excessive heat, humidity, or direct sunlight.
5. Do not use this wrench in water (not waterproof).
6. If the wrench gets wet, wipe it with a dry towel
as soon as possible. The salt in seawater can be
especially damaging.
7. Do not use organic solvents, such as alcohol or
paint thinner when cleaning the wrench.
8. Keep this wrench away from magnets.
9. Do not expose this wrench to dust or sand as this
could cause serious damage.
10. Do not apply excessive force to the LCD panel.
11. Apply torque slowly and grasp the center of the
handle. Do not apply load to the end of handle.
BATTERY MAINTENANCE
1. When the wrench is not going to be used for an
extended period of time, remove the battery.
2. Keep a spare battery on hand when going on a
long trip or to cold areas.
3. Do not mix battery types or combine used
batteries with new ones.
4. Sweat, oil and water can prevent a battery’s
terminal from making electrical contact. To
avoid this, wipe both terminals before loading a
battery.
5. Dispose of batteries in a designated disposal area.
Do not throw batteries into a fire.
ATTENTION:
1. A one-year periodic recalibration is
recommended to maintain accuracy.
2. Please contact NAVAC technical support
for calibration details.
Rev.： NTW1 v1
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