Specialized manufacturer of Digital Pressure Meters and Load Cells

VALCOM CO.,LTD.

 

Rapid Strain Gauge Panel Meter
VGM series


Use in combination with pressure sensors or load cells.

SPC function enables monitoring at 4 points in pressurization process!

Suitable for press fitting, caulking and molding!

  • Measurement at any 4 points during pressurization process improves the accuracy of Go/No-Go judgment significantly.
  • Lower in cost compared to pressure waveform data comparators.
  • Initial peak removal function enables comparative measurement without counting irregular peaks that may appear when contacting the work.
  • 3 types of output: Analog 4-20 mA, 0-10V and BCD are available.
  • Peak hold function
    "A type" that shows the peak value at all times or "B type" that shows peak per shot can be selected.
  • Digital zero function
    This function determines the value displayed immediately before as "zero".
  • Tracking zero function
    This function corrects the internal zero shift digitally and automatically.
  • Pattern select function
    Up to 4 patterns of comparison can be set.

Clear Initial Peak Function

Clear Initial Peak Function

To exclude sudden input from counts when contacting work, Clear Initial Peak function is provided.

This function enables comparison while ignoring initial peak values that are not necessary as the condition for comparison.
It is also useful if effective maximum load falls short of the initial peak value like when the maximum load is held at all times.
The time period ("T" in the figure) for clearing initial peak can be set as desired. This allows comparative measurement suitable to the system to be used.

Peak Hold Function

Peak Hold Function

This function displays the peak of the load value. Two types A and B are available. A type displays the peak value at all times, whereas B type shows peak per shot.

Peak hold A is of free run type. It holds the peak value until the PH terminal signal is open or level "1" is reached.In the case of right figure, the second peak of point B is ignored and the first of point A will be held until a value more than the point A.

Peak hold B type displays the maximum load value shot by shot.
While the PH terminal signal is open or level is "1", the peak value is kept being held. However, the display will not follow it and will be displayed at each fall of PH terminal.
In the case of right figure, the third peak of point F is ignored because PH terminal is 0, and the peak at point G will be displayed.

Digital Zero Function

This function determines the value displayed immediately before as zero.

Display thereafter will be as follows:
(Input value − Digital zero value) = Displayed value

Where this function is useful!
This function is effective when there is a preload such as the weight of jig is on the load cell. Use of the digital zero function ignores the weight of the jig and detects the load only, thus ensuring correct measurement.

Comparison Result Check Function

This function allows the results of comparison to be checked when the SPC function is used.

Press S + while the SPC function is working. The results of comparison C1 to C4 finished so far can be checked. The pattern number area shows the comparison number and the main display shows measured value when comparison has been carried out. Comparison area shows the set values of comparison C1 to C4. Each time the button is pressed, the selected number changes.

When judged as NG due to an abnormal pressure, this function is useful for identifying the point where the abnormal pressure occurred among C1 to C4 in the process immediately before.

Comparison Result Check Function

Pattern Select Function

This function allows the user to set up to 4 patterns of comparison C1 to C4 and select them as desired.

Up to 4 patterns of comparison C1 to C4 can be set. Since patterns can be switched easily by shorting the external circuits, changes to the comparative setting values when changing the work can be reduced significantly. (It is also possible to switch patterns via the front keys according to the condition data setting.)

Tracking Zero Function

Tracking Zero Function

This function corrects zero-shift internally and automatically. It works when the digital zero works.

Checks the measured value at the preset correction cycle, and corrects it to zero if within the correction range. Correction cycle and range can be set as desired. (See figure at right.)

Correction cycle = 3 samples, When correction range = 3 digits

①Digital zero and tracking zero functions start. Display is zero because the measured value is within the correction range.
②③Displayed values are within 3 digits, and therefore corrected to zero.
④No correction because the measured value is out of correction range.
⑤Displayed value is again within 3 digits, and corrected to zero.

VGM-2SO-A3-1/VGM-2SO-A5-1/VGM-2SO-B4-1 Common specifications

Specifications

Operation method Successive comparison method
Accuracy (*1) ± (0.15% of F.S. +1digit) (23°C±5°C)
± (0.05% of F.S. +1digit) (23°C±5°C, Sampling speed=20, 10, 5, 2, 1 times/sec)
Sampling speed 2000 times/sec
Display 7 segment LEDs (Light emitting diode numeric elements) Height 14.2mm (red)
height of comparison setting deisplay unit, 8mm (green)
Temperature characteristic ± (0.005% of rdg +0.5digit)/°C
Polarity display "-" is displayed when the result of computation is negative
Overrange display "o.L." or "-o.L."is displayed for the input signal of exceeding the measuring range
Zero display Leading zero suppression
Monitor display Peak hold (PH), digital zero (DZ), and digital zero backup (ME)
Applicable sensor Various strain gauge type sensors (350Ω)
Sensor power supply 5 VDC ±10% 60 mA
Zero point adjustment range −1.000 to +1.000 mV/V
Gain adjustment range 0.001 to +3.300 mV/V
Minimum input range 0.5µV/digit (At a sensor power supply voltage of 5 VDC)
Maximum input voltage 3.3 mV/V
Maximum display 9999 (all 4 digits)
Decimal point Settable to any postion (Selected by the front key)
  • *1 Take the accuracy of the selected pressure sensor or load cell into account.

Comparison block

control method Computing method by microcomputer
Setting range High/low limit setting including polarity; -9999 to 0 to 9999
Comparison operation 1-point comparison by comparisons 1 to 4 or continuous comparison by comparison
Photo-coupler output (NPN type) Voltage:30 V max; Current:20 mA max;
Saturated output voltage:Less than 1.2 V at 20 mA
Hysterseis Can be set from 1 to 999 digits (only for comparision 1) for each compariosn setpoint
Comparison condition Comparison condition Comparion result
Measured value > High setpoint HI
High setpoint ≥ Measured value ≥ Low setpoint value GO
Low setpoint value > Measured value LO

External control

Hold The S/H terminal shorted with the COM terminal or set to level "0"
Start The S/H terminal opened from the COM terminal or set to level "1"
Digital zero The displayed value just before the DZ terminal is shorted with the COM terminal or
set to level "0" is set to "Zero" and this value is stored
Pattern select Four patterns can be freely set by combing the COM terminal with the P.SEL terminals 0 and 1
Peak hold
Valley hold
Peak valley hold
The PH terminal shorted with the COM terminal or set to level "0"
The type of peak hold depends on the respective
setting of comparison 1 to comparison 4
Comparison terminals The comparison terminal C1 to C4 shorted with the COM terminal or set to level "0"
CLEAR The result of comparison released with the CLR terminal shorted with
the COM terminal or set to level "0"
  • *Input rating of each control: "0" Level: 0–1.5V, "1" Level: 3.5–5V, Input current :-2mA or less

VGM-2SO-A3-1/VGM-2SO-A5-1/VGM-2SO-B4-1 Common specifications

Common specifications

Check Model Input/Output specifications
  VGM-2SO-A3-1
Analog output type
(4–20mA)
Output signal 4–20mA
  Load resist 0–270Ω
  Accuracy ±0.5% of F.S.
  Ripple 25 mVp-p (Ripple in 4 to 20 mA; At 250Ω load and 20 mA)
  Resolution Equal to 14 bits
  Temperature coefficient ±200ppm/°C
  Output response Less than 700 µs (0–90%)
  Dielectric strength Between the input terminal and COM of each output (ANALOG OUT: -)
For 1 min. at 500 VDC
Between the input terminal and COM of each output (ANALOG OUT: -)
For 1 min. at 1500 VAC
  Accessories Instruction manual
Terminal cover
Check Model Input/Output specifications
  VGM-2SO-A5-1
Analog output type
(0–10V)
Output signal 0–10V
  Load resist More than 10 kΩ
  Accuracy ±0.5% of F.S.
  Ripple 50mVp-p
  Resolution Equal to 14 bits
  Temperature coefficient ±200ppm/°C
  Output response Less than 700 µs (0–90%)
  Dielectric strength Between the input terminal and COM of each output (RS-232C: SG)
For 1 min. at 500 VDC
Between the input terminal and COM of each output (RS-232C: SG)
For 1 min. at 1500 VAC
  Accessories Instruction manual
Terminal cover
Check Model Input/Output specifications
  VGM-2SO-B4-1
BCD Open-collector
(NPN type)
Measured data Transistor turned "ON" for negative logative "1"
  Polarity signal Transistor turned "ON" for minus display
  OVER signal Transistor turned "ON" for OVER display
  Printing command signal Transistor turned "ON" in the fixed section each time measurement is finished
(Depending on the sampling speed)
  Transistor output capacity Voltage, 30V max.
Current, 15mA max.
Saturated output voltage, Less than 1.2 V at 15 mA
  Dielectric strength Between the input terminal and COM of each output (BCD: D.COM)
For 1 min. at 500VDC
Between the input terminal and COM of each output (BCD: D.COM)
For 1 min. at 1500VAC
  Accessories Instruction manual
Terminal cover
  • *The output becomes "0000" during the following operation.
  • *BCD data output isolated from input

Terminal connection

Terminal connection

Dimensions (Unit: mm)

External dimensions

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