TOHNICHI CEM3-G-BTA (01) PDF DOCUMENT

The TOHNICHI CEM3-G-BTA is a digital torque and angle wrench with the following features:

• Records and outputs the final torque and angle of a tightening operation.

• Performs Pass/Fail judgments based on set torque and angle thresholds.

• Uses torque and angle values to detect double tightening errors.

• Features a built-in Bluetooth® module for wireless data transmission.

The TOHNICHI CEM3-G-BTA judges the tightening result based on set thresholds for torque and angle. The result is displayed as a two-digit alphabet code.

The graph on the tool illustrates different judgment zones based on Torque (T) and Angle (θ). The key thresholds are:

• Trg: Trigger torque (where angle measurement begins)

• TL: Lower limit torque

• TH: Higher limit torque

• θw: Double tightening detection angle

• θL: Lower limit angle

• θH: Higher limit angle

The two-digit judgment code is interpreted as follows:

First digit alphabet (Torque Judgment):

• “O”: OK (Torque is within the lower and higher limits)

• “L”: Low NG (Torque is below the lower limit)

• “H”: High NG (Torque is above the higher limit)

Second digit alphabet (Angle Judgment):

• “D”: Double tightening detection NG (Angle is less than θw)

• “O”: OK (Angle is within the lower and higher limits)

• “L”: Low NG (Angle is below the lower limit)

• “H”: High NG (Angle is above the higher limit)

Example: A judgment code of “LD” means “Low torque NG and Double tightening detection NG”.

The TOHNICHI CEM3-G-BTA provides specific judgment results based on the combination of torque and angle settings. The following table details the judgment codes and conditions. Note that tightening direction NG is prioritized over torque judgment, and double tightening detection NG is prioritized over other angle judgments.

The buttons on the TOHNICHI CEM3-G-BTA have the following functions:

• ▲ (Upper arrow key): Advances the counter one by one or continuously (fast-forward) to read out measured data.

• ▼ (Down arrow key): Reverses the counter one by one or continuously (fast-forward) to read out measured data.

• MD (Mode key):

– When the counter is “000”: Push and hold for 2 seconds to enter the settings menu.

– When the counter is between “001” and “999”: Push to process the measured data (e.g., Max., Min., Ave.).

• MEM (Memory key): Saves the current measured data and advances to the next counter. It also transfers the data to an external device via Bluetooth® or cable.

• C (Clear key): Clears saved measurement data. In RUN mode, it performs an auto zero adjustment.

• POWER (Power button):

– When turning on with angle setting enabled, the tool performs an angle speed check. The tool must be kept still for more than 2 seconds to avoid an “Err0” message.

– When power is on, Bluetooth® is also turned on (indicated by a red LED).

– To power off only the tool display, press the Power key once.

– To turn off both the tool and the Bluetooth®, press and hold the Power key for 2 seconds.

To calibrate the TOHNICHI CEM3-G-BTA, first set the memory counter to “000” using the upper (▲) and down (▼) arrow keys. Then, proceed to calibrate the tool using a torque wrench tester for torque calibration and an angle calibrator for angle calibration.

The TOHNICHI CEM3-G-BTA has two measurement modes with distinct purposes:

• Inspection mode (MODE-M): This mode is used for re-tightening and breakaway inspections. When high and low limit torque values are set, the tool will judge the measured torque result. The double tightening detection feature is turned off in this mode. The display will show “M” on the left side.

• Tightening mode (MODE-T): This mode is used for the tightening process. It allows you to set high/low torque limits, high/low angle limits, a double tightening detection angle, and the direction of tightening. As the applied torque reaches about 80% of the low limit torque, the tool will beep intermittently and the blue LED will flash. Once the low limit torque is reached, the tool will emit a continuous beep and the red LED will light up. The display will show “T” on the left side.

The display mode of the TOHNICHI CEM3-G-BTA depends on the memory counter setting:

• RUN mode (Counter is “000”): This mode shows the torque value being applied at the moment. The display returns to zero when the torque is released. If angle setting is on, the left display shows the angle value, with clockwise (CW) rotation being positive and counter-clockwise (CCW) being negative.

• Peak mode (Counter is “001” to “999”): This mode captures and holds the maximum torque value applied during an operation. If low and high limit torque values are set, they are displayed in the upper corners of the left display. When a trigger torque is set, angle measurement starts once that torque is reached. The display holds the maximum angle value even after the torque is released. CW rotation is positive, and CCW is negative.

The following table explains the error messages, their indications, and solutions for the TOHNICHI CEM3-G-BTA.

Auto Memory / Reset:

After a tightening or measurement, the values are automatically saved, and the memory counter advances to the next position. The timing for this auto memory function can be set from 0.1 to 5 seconds. To disable this feature, set the timer to 0.0 seconds.

Mute:

By setting the buzzer to “Off” in the settings menu, the buzzer sound for key operations will be turned off. However, critical alarms such as the over-torque alarm, tightening completion notification, and NG judgment alarm will remain active.

Electric Power Saving:

If the tool is left without any key or tightening operation for about 1 minute, the 7-segment LED display will darken to save electricity. This mode is only available when the Auto Power Off feature is set to ON.

Auto Power Off:

The power will automatically turn off if the tool is left idle for a set time (default is 3 minutes) or is in an unloading condition (torque is less than 7.5% of max capacity). This feature can be set to OFF. In a “LoBATT” (low battery) condition, the power will turn off in 1 minute regardless of this setting.

The residual battery amount is indicated on the display by a battery icon with four bars:

• Four bars solid: Full

• Two bars solid: Half remaining

• One bar blinking: Time to charge battery

• Empty icon blinking (“LoBATT” condition): No battery available. Recharge immediately. In this state, key operations will not work, and the tool will automatically turn off in 1 minute. Settings and data are retained.

When the applied torque exceeds 105% of the maximum measurable torque, the display value and “- – – -” will blink alternatively, and the buzzer will sound. The following table provides the specific values for each model in N·m. Values in () indicate the minimum setting value for trigger torque; accuracy below this value is not guaranteed.

This example demonstrates a tightening operation with specific settings. To measure angle, both angle setting and trigger torque must be enabled.

Example Settings:

• Angle setting (Ang): ON

• Measurement mode (SEL): MODE-T

• Lower limit torque (Lo): 30N·m

• Higher limit torque (Hi): 45N·m

• Trigger torque (Trg): 5N·m

• Double tightening detection angle (An_d): 5 deg

• Lower limit angle (An_L): 10 deg

• Higher limit angle (An_h): 50 deg

• Auto reset timer (Ar): 0.5 sec

• NG output setting (ng): NG_MAN

• Output format (dCn): M3+ID

Procedure:

1. Set the tool to Peak mode by setting the counter between “001” and “999” and begin the measurement.

2. When the applied torque reaches the trigger torque (5 N·m in this example), the tool starts measuring the angle.

3. As the torque approaches 80% of the lower limit torque (24 N·m), the tool will beep intermittently, and the blue LED will blink to alert you that the target is near.

4. When the torque reaches the lower limit (30 N·m), the tool will emit a continuous beep, and a solid blue LED will indicate the completion of tightening.

5. After releasing the torque load, the tool judges the measured data. This happens automatically if the Auto reset timer is on; otherwise, press the “MEM” key.

– If the judgment is OK: The blue LED turns on, and the tool outputs the measured torque and angle data to the external device.

– If the judgment is NG (with NG_MAN setting): A solid red LED will light up. The left display will alternate every second between showing the NG judgment code (e.g., “OD-NG”) and the measured angle. You must press “MEM” to save and send the data.

6. The tool saves the data, advances the counter to the next number, and resets the measured data display to zero, ready for the next operation.

This example demonstrates an inspection operation (re-tightening or breakaway). To measure angle, both angle setting and trigger torque must be enabled.

Example Settings:

• Angle setting (Ang): ON

• Measurement mode (SEL): MODE-M

• Lower limit torque (Lo): 35N·m

• Higher limit torque (Hi): 45N·m

• Trigger torque (Trg): 5N·m

• Double tightening detection angle (An_d): 0 deg (Note: this feature is off in MODE-M)

• Lower limit angle (An_L): 10 deg

• Higher limit angle (An_h): 50 deg

• Auto reset timer (Ar): 0.5 sec

• NG output setting (ng): NG_MAN

• Output format (dCn): M3+ID

Procedure:

1. Set the tool to Peak mode (counter between “001” and “999”) and begin the measurement.

2. When the applied torque reaches the trigger torque (5 N·m), the tool starts measuring the angle.

3. After completing the measurement and releasing the torque load, the tool judges the result. This happens automatically if the Auto reset timer is on; otherwise, press the “MEM” key.

– If the judgment is OK: A solid blue LED turns on, and the tool outputs the measured torque and angle data to the external device.

– If the judgment is NG (with NG_MAN setting): The red LED turns on, the buzzer sounds continuously, and the left display alternates every second between the NG judgment code (e.g., “LO-NG”) and the measured angle. You can press “MEM” to save and output the data, or press “C” to clear it.

4. Data Saving:

– If the judgment was OK or if Auto reset is used, the counter automatically advances to the next number, and the display resets.

– If the judgment was NG and you pressed “MEM” to save, the counter advances to the next number, but the display will show the memory data for that new counter if it already exists.

• Power On: When you press the “Power” switch to turn on the tool, the Bluetooth® module also powers on, and the red power LED will turn on.

• Power Off: To turn off the Bluetooth® power (to save the battery), press and hold the “Power” switch for more than 2 seconds while the tool is on. Just pressing the “Power” switch once will only turn off the tool’s display, not the Bluetooth®.

• Auto Power Off: Note that when the Auto power off feature activates, it only turns off the display; the Bluetooth® power remains on.

• Connection Status: When the Bluetooth® is successfully connected to another device, the blue STATUS LED will turn on. It will turn off after the connection is terminated.

Bluetooth® Communication Specifications:

*Communication distance varies depending on the radio wave environment and the connecting device.

Communication Conditions:

※ The connecting device may require a PIN code or passcode. If so, enter “0000”.

※ When using the optional USB cable (catalog #584), a driver software installation on your PC is required.

The communication format depends on the setting chosen on the tool.

When set to “M3+ID”:

The output is a 59-character string.

The 7-digit ID can be changed via external command. The default is the serial number of the CEM3-G-BTA.

When set to “M-3”:

The output is a 32-character string.

Settings on the TOHNICHI CEM3-G-BTA can be changed by sending ASCII commands from an external device. The tool must not be under torque load when changing settings. When sending multiple commands, ensure there is an interval of more than 200 ms between them. All commands must end with “CRLF”.

Response Commands from the Tool:

The following table lists the configurable settings, display codes, default values, selectable options, and notes for the TOHNICHI CEM3-G-BTA.

Follow these steps to change settings via key operation:

1. Enter Setting Mode: Set the memory counter to “000” using the upper/down arrow keys. Then, press and hold the “MD” key for more than 2 seconds.

2. Navigate Settings: Use the upper or down arrow keys to change the value for the current setting. Press the “MEM” key to save the setting and move to the next one. Press the “MD” key to skip a setting without changing it. Press the “C” key at any time to exit setting mode and return to RUN mode.

Sequence of Settings:

i. Angle feature (Ang): Select ON or OFF.

ii. Measurement mode (SEL): Select MODE-T (Tightening) or MODE-M (Inspection).

iii. Unit of torque (USEL): Select N.m, kgf.cm, kgf.m, lbf.in, or lbf.ft.

iv. Lower limit torque (Lo): Use the down arrow key to change the number and the upper arrow key to move the digit.

v. Higher limit torque (HI): Set the value. Must be greater than the lower limit.

vi. Trigger torque (trg): Set the torque at which angle measurement begins. (Skipped if Angle feature is OFF).

vii. Double tightening detection angle (An_d): Set the angle for double tightening judgment. (Skipped if in MODE-M).

viii. Lower limit angle (An_L): Set the lower angle limit. Must be greater than the double tightening angle.

ix. Higher limit angle (An_H): Set the higher angle limit. Must be greater than the lower limit angle.

x. Tightening direction (tUrn): Select CW, CCW, or BOTH.

xi. Auto reset timer (Ar): Select from 0.0 to 5.0 seconds.

xii. NG data processing (ng): Select NG_MAN (Manual output) or NGAUTO (Auto output).

xiii. Buzzer (bU): Select ON or OFF.

xiv. Auto power off (PoFF): Select 3MIN, 10MIN, 30MIN, or NONE.

xv. Communication mode (dO): Select BT (Bluetooth®) or PC (Cable). If BT is selected, the next three settings are skipped.

xvi. Baud rate (bPS): Select 2400, 4800, 9600, or 19200 bps.

xvii. Data length (dL): Select 7BIT or 8BIT.

xviii. Parity (Prt): Select EVEN, ODD, or NONE.

xix. Communication format (dCn): Select M-3 or M3+ID. Changing this will clear measured data.

xx. Default setting (dFLt): Select DFT-N (No) or DFT-Y (Yes). Selecting DFT-Y and pressing MEM will perform a factory reset (except for time/date).

xxi. Time and Date (rtC1, rtC2): Set the hour, minute, second, year, month, and day.

After the last setting, the tool will automatically return to the measurement display.

To output a range of stored measurement data, follow these steps:

1. Use the ▲ and ▼ keys to navigate to the counter number that corresponds to the upper end of the data range you want to output (e.g., for data 1 to 200, navigate to 200).

2. Press the “MD” key. The left display will show “STT” and the right display will prompt for the lower end of the range.

3. Use the ▲ and ▼ keys to set the number on the right display to the lower end of the data range (e.g., for data 101 to 200, set the number to 101).

4. Press the “MD” key again. The right display will now show the total number of data points in the selected range that will be output.

5. Press the “MD” key one more time to begin the batch data output.

• If the tool is connected via Bluetooth, the right display will turn off, and the left display will show the counter numbers being sent, from the lower to the upper end.

• NOTE: During data output, only the “C” key is active, which can be used to cancel the output. Other keys will not work.

6. Once the output is complete, the display will show the total quantity of data sent. Press “MD” or “C” to return to the measurement mode.

This function processes a selected range of saved data to calculate the data quantity, maximum, minimum, and average torque. Note that only peak hold and saved data will be processed.

1. Use the ▲ and ▼ keys to set the counter number to the upper end of the data range you wish to process (e.g., 200).

2. Press the “MD” key. “STT” will appear on the left display.

3. Use the ▲ and ▼ keys to set the lower end of the data range on the right display (e.g., 1 for data 1-200, or 101 for data 101-200).

4. Press the “MD” key. The right display shows the number of data points to be processed (e.g., “192”).

5. Press the “MD” key to proceed. The display will now show the maximum (MAX) torque value in the selected range.

6. Press “MD” again. The display will show the minimum (MIN) torque value.

7. Press “MD” again. The display will show the average (AVE) torque value.

8. Pressing “MD” again will cycle back to the maximum value display. You can press the “C” key at any point during the MAX/MIN/AVE display to return to the measurement mode.

You can delete a single data point or a selected range of data.

To delete a single data point:

1. Use the ▲ and ▼ keys to navigate to the counter number of the data you wish to delete.

2. Press the “C” key. The torque value on the right display will change to “0.0”, indicating the data for that counter has been deleted.

To delete a selected range of data (or all data):

1. Use the ▲ and ▼ keys to set the counter number to the upper end of the range you want to delete (e.g., 200).

2. Press the “MD” key. “STT” will appear on the left display.

3. Use the ▲ and ▼ keys to set the lower end of the range on the right display (e.g., 1 for data 1-200). To delete all data, set the upper end to 999 and the lower end to 1.

4. Press the “MD” key. The display will show the number of data points in the selected range (“N”), or the MAX, MIN, or AVE value if you continue to press MD.

5. While the left display shows “N”, “MAX”, “MIN”, or “AVE”, press and hold the “MD” and “C” keys at the same time. The left display will show “CLEAR”.

6. Release both keys. The selected data range has been deleted. The tool will return to measurement mode at the lower end counter number.