T.J. Snow > Supplies > Miyachi > Dedicated Weld Checkers

Permanent Mount Weld Checkers:

MM-121B Weld Checker -- forresistance spot welders
MM-131B WeldChecker -- for Capacitor Discharge type resistance welders.

Both Feature:

Stores 15 different windows. Measuresand monitors weld current and cycles at every half cycle for each schedule.
Warning Light indicates weld conditionsoutside of set parameters
Operates as a preset counter (up to99,999 welds) to indicate number of welds completed.
Detects NO CURRENT via initiation signalinput.
RS-422 (15 pin) Data out port.
Option external audio alarm and remotemonitoring capability
Bright, easy-to-read, LED monitor displays.
Enclosed front panel protects againstoil mist and dust

MM-121B

A high precision weld monitor for resistancespot welders. Measures both the weld current and the cycles and displaysthese values digitally, comparing them with the current and cycle parametersset by the user.

**Miyachi MM-121B Weld Checker Specifications**
Power:	Requirements:	110VAC ±10%, 50Hz/60Hz, automaticselection
Power:	Consumption:	15VA, not including "NG" (110V)output. 50VA max.
Current Measurement:	Pick-Up:	Toroidal coil
	Ranges:	2 ranges: 9.99: 0.50-9.99KA 99.9: 0.50-99.9KA
	Accuracy:	±2% against full scale orless
	Value:	Average true RMS for measured intervalregardless of wave shape.
	Interval:	First: 1-99 cycles Last: 1-99 cycles
	Display:	3 digit, .3 in (.8 cm) 7 segmentLEDs
	Outputs:	Trigger-- indicated weld is beingmeasured (1k, 5mA, 12VDC) Signal-- analog wave form representingsecondary wave form (1k, 5mA) Both are available through a rearpanel plug.
Cycle Measurement:	Ranges:	0.5 to 99.5
	Accuracy:	Absolute
	Display:	3 digit, .3 in (.8 cm) 7 segmentLEDs
Current Monitoring:	Settings:	3 digit; 000-999
	Gate Input:	Monitor inhibiting input
	No Current:	Current drop below trigger sensitivity(2% against full scale) is regarded as "NO CURRENT", triggering a red LEDwhen the external solenoid valve is off.
	Limits:	HIGH and LOW each trigger red LEDs. NORMAL triggers a green LED. Thereis an automatic reset at the beginning of the next weld sequence. The internalrelay signal is output for 100mS.
Cycle Monitoring:	Settings:	HIGH and LOW -- two digit. 0.5-99.5cycles.
Cycle Monitoring:	Limits:	HIGH and LOW each trigger red LEDs. NORMAL triggers a green LED. Thereis an automatic reset at the beginning of the next weld sequence. The internalrelay signal is output for 100mS.
Functions:	Schedule Setting:	15 schedules. The current scheduleis selected by pressing the SCHED switch on the front panel, or via rearpanel plug. 0-9 pulses. Measures and monitors impulse welding.
Functions:	Counter:	1 setting for all 15 schedules.0 to 99,999 Preset: Flashing LED indicates whenthe preset number of welds is reached. Step: Flashing LED indicated whenthe number of welds for step-up is reached.
Physical Properties:	Dimensions:	Height 8.9 in x Width 3.5 in. xDepth 12 in. (226mm x 90mm x 307mm)
Physical Properties:	Weight:	11 lb. (5kg)

LargePicture of the MM-121B Weld Checker:

Miyachi MM-121B Weld Checker

MM-131B

Designed to deliver precise capacitordischarge type resistance welder monitoring. Measures both the weld currentand the pulse width. The measured values are digitally displayed and comparedagainst current and pulse width parameters entered by the user. It canmeasure both peak values (1p) and effective values (RMS) simultaneouslyand monitor either. The unit can also simultaneously measure pulse widthsas time from the start of the welding until the peak current (Tp) is reached,and the time until the current reaches half of the peak (Th), and monitorone of these values.
(See the Graph below)

Graph of the wave form: Graph of Waveform

**Miyachi MM-131B Weld CheckerSpecifications**
Power:	Requirements:	110VAC ±10%, 50Hz/60Hz, automatic selection
Power:	Consumption:	15VA, not including "NG" (110V) output. 50VA max.
Current Measurement:	Pick-Up:	Toroidal coil
	Ranges:	2 ranges: 9.99: 0.50-9.99KA 99.9: 0.50-99.9KA
	Accuracy:	±2% against full scale or less
	Value:	Peak value or RMS regardless of wave shape.
Pulse Width Measurement:	Ranges:	2 ranges: 9.99: 0.50-9.99MS 99.9: 0.50-99.9MS
	Accuracy:	± 1% against full scale
	Display:	Value: Tp (Time to reach peak of current value) or Th (Time to reach Ip/2)
Weld Current and Pulse Width Monitoring:	High and Low Settings:	3 digit; 000-999 One Display for Both
	No Current:	Current drop below trigger sensitivity (2% against full scale) is regardedas "NO CURRENT", triggering a red LED when the external solenoid valveis off.
	Limits:	HIGH and LOW each trigger red LEDs. NORMAL triggers a green LED. There is an automatic reset at the beginningof the next weld sequence. The internal relay signal is output for 100mS.
Functions:	Schedule Setting:	15 schedules. The current schedule is selected by pressing the SCHEDswitch on the front panel, or via rear panel plug.
Functions:	Counter:	1 setting for all 15 schedules. 0 to 99,999 Preset: Flashing LED indicates when the preset number of welds is reached.
Physical Properties:	Dimensions:	Height 8.9 in x Width 3.5 in. x Depth 12 in. (226mm x 90mm x 307mm)
Physical Properties:	Weight:	11 lb. (5kg)

Large Picture of the MM-131BWeld Checker:

Miyachi MM-131B Weld Checker

For further information, please contact T. J. Snow. We will be gladto help you select the correct weld checkerfor your application.

Compare Weld Checker Models in chart form.

Contact Information:	6203-6207Jim Snow Way P. O. Box 22847 Chattanooga,TN 37422	(423)894-6234 1-800-NOW-SNOW FAX (423) 892-3889 ORDER FAX (423)490-2417
	welders@tjsnow.com