Specialized manufacturer of Digital Pressure Meters and Load Cells

VALCOM CO.,LTD.

 

DIN36×72 Rapid Strain Gauge Panel Meter
VMM7 series


Use in combination with pressure sensors or load cells.

High-speed at a maximum of 1000 samples per second, compact design and high functionality.

Alternating green and red LED intuitively understandable for users.

  • Input range of Strain gauges (−4 to 4mV/V) can be connected to pressure sensors and load cells.
  • High speed sampling at a maximum of 1000 samples per second.
  • Models with analog outputs are multiple output type that enables scaling at any range among 0 to 1 V, 0 to 10 V, 1 to 5 V, and 4 to 20 mA.
  • Compact design of 72 (W) × 36 (H) mm (DIN standard) and space-saving, with an easy-to-read large monitor of 16 mm in character height.
  • LED alternates between red and green, allowing the judgment result to be identified by color.
  • Five comparison setting outputs and various functions included as standard.
    "Start hold", "Digital zero", "Peak hold" and "Pattern select" functions included.

Various Functions

Pattern Select Function

This function stores up to eight patterns of scaling data and comparator data, and allows the users to set patterns as desired.
Pattern selection can be controlled either via terminals or via front keys according to the condition data setting. In case of control via terminals, short the terminals between P.SEL1 to 3 and COM or make them equipotential to enable pattern switching from P-1 up to P-8. In case of control via front keys, hold down the increment key for approx. 3 seconds to switch patterns.

Start Hold Function

This function holds the display at the desired timing. Either A or B type can be set according to the condition data.
A type is a free run mode. In the free run condition, shorting S/H and COM terminals or making them equipotential will hold the displayed value and the comparison judgment value.
B type is a one-shot mode. In the hold condition, shorting S/H and COM terminals or making them equipotential will output the displayed value and the comparison judgment value once.

Peak Hold Function

This function holds any of the maximum (peak) value, the minimum (valley) value, and the difference between the maximum and the minimum (peak – valley) and outputs the value held. (The value to be held is switched according to the condition data.)
Shorting S/H and COM terminals or making them equipotential will turn ON the peak hold function.

Digital Zero Function (Display reset function)

This function forcibly zeros the displayed value. It is useful when subtracting tare weight during load measurement with load cells connected.
Display reset (Digital zero) function ON/OFF can be controlled via terminals or via front keys according to the condition data setting.
In case of control via terminals, shorting the terminals between DZ and COM or make them equipotential to turn ON the display reset function. In case of control via front keys, hold down the shift key for approx. 3 seconds to turn ON the function.

Specifications

Display 7-segment LED display (character height: approx. 16mm)
Polarity display Automatically indicated when the calculation result is negative
Display range −9999 to 9999
Overrange warning "OVER" or "-OVER" indication in response to an input signal exceeding the display range
Decimal point Settable to any digit position
Zero indication Leading zero suppression
External control P.SEL1–3,HOLD,PH,DZ (depending on output units)
Operating temperature ranges 0 to 50°C
Operating humidity ranges 35 to 85%RH (no condensation)
Storage temperature ranges −10 to 70°C
Storage humidity ranges 60%RH or less
Power supply AC power unit: 100 to 240V AC ±10% DC power: 12V to 48V DC ±10%
Power consumption 8VA max. (AC power unit)
7W max. (DC power unit)
Withstand voltage C power: Power terminal to input terminal, COM, comparison output, BCD,
analog output, or RS communications terminal 1500V AC for 1 minute
DC power: Power terminal to input terminal, COM, comparison output, BCD,
analog output, or RS communications terminal 50 V DC for 1 minute
(common): Input terminal to comparison output, BCD, analog output, or
RS-communications terminal 500V DC for 1 minute
Insulation resistance 500 V DC at 100MΩ or more between the noted terminals
Outer demensions 72mm(W)×36mm(H)×118mm(D)
Weight Approx. 160g
Accessories Instruction Manual×1

Strain gauge input specifications

Zero adjustment range −±1mV/V
Span adjustment range 1–3mV/V
Maximum Resolution Sensor Power Supply 5V: 0.5µV/digit
Sensor Power Supply 10V: 1µV/digit
Accuracy(*1) ± (0.1% of F.S.+2digit) (23°C±5°C 35–85%)
Sampling rate 1000 times/sec
Sensor Power Supply 5V±5% 30mA
10V±5% 30mA
Applicable Sensor 350Ω
  • 1) Accuracy applies when the sampling rate is 20 samples/s or less.

Comparator Output Specifications

Control method Microcomputer-based calculation method
Judgment value setting range −9999 to 9999
Hystersis Settable in the range of 1 to 999 digits with respect to each judgment value
Comparison action Depending on sampling rate
Comparison conditions indicated value > High-high limit judgment value > high limit judgment value Judgment:HH, HI
High-high limit judgment value ≥ indicated value > high limit judgment value Judgment:HI
high limit judgment value ≥ indicated value ≥ low limit judgment value Judgment:GO
low limit judgment value > indicated value ≥ low-low limit judgment value Judgment:LO
low limit judgment value > low-low limit judgment value > indicated value Judgment:LO, LL
Setting conditions High-high limit judgment value > high limit judgment value > low limit judgment value > low-low limit judgment value
Comparator relay Number of contacts Relay contact ×5
Contact rating 125V AC, 0.3A (resistive load)
30V DC, 1A (resistive load)
Mechanical life 50 million times or more
Electrical life 100,000 times or more (resistive load)
Photocoupler output Output quantity Photocoupler ×5
Output rating Sink current 50 mA MAX.
Voltage applied: 30V MAX.
Output saturation voltage 1.2V or less at 50 mA

Analog Output Specifications

Resistive Load 0 to 1V, 0 to 10V, 1 to 5V:10kΩ or more
4 to 20mA: 550Ω or less
Accuracy ± (0.5% of F.S.)
Ripple 0 to 1V, 0 to 10V, 1 to 5V: ±50mVpp
4 to 20mA: ±25mVpp
Conversion method PWM conversion
Resolution 13 bits or equivalent
Scaling Digital scaling
Response rate Approx. 0.5 seconds

BCD Output Specifications

Output type Open collector output NPN type
Output Logic Selectable (PC logic cannot be changed.)
Output rated DC30V MAX 10mA MAX

RS-232C Output Specifications

Synchronous System Start-stop transmission system
Communication System Full duplex
Transmission Rate 38.4k to 2.4k bps
Star bit 1bit
Data Length 7bit/8bit
Parity Even parity/odd parity/none
Stop bit 1bit/2bit
Character Code ASCⅡcodes
Signal Name in Use TXD, RXD, SG
Number of Units Connected 1
Line Length 15m
Delimiter CR+LF/CR

RS-485 Output Specifications

Synchronous System Start-stop transmission system
Communication System Two-line semi-duplex (polling selecting system)
Transmission Rate 38.4k to 2.4k bps
Star bit 1bit
Data Length 7bit/8bit
Parity Even parity/odd parity/none
Error Detection BCC (block check character) checksum
Stop bit 1bit/2bit
Character Code ASCⅡcodes
Signal Name in Use Non-inverse (+), inverse (−)
Number of Units Connected A maximum of 31 meters
Line Length 500m maximum
Delimiter CR+LF/CR

Model Selection

Example

Selection Check Model Specifications
1.Model VMM7 DIN36×72 Rapid Strain Gauge Panel Meter
2.Comparison Setting Output - - No. of settings Output type
  0SO - - Only B0 can be selected
  4S 4-point (HH/H/G/L/LL) Relay signal×5
AC125V 0.3A (Load resistance)
DC30V 1A (Load resistance)
*Selection with analog output,
RS232C output and RS485 output is impossible.
  4SO 4-point (HH/H/G/L/LL) Photo-coupler×5
Sink current: 50mA MAX.
Applied voltage: MAX.
-
3.Output   D None
  A Can be switched among four types: 1–5V or 0–1V or 0–10V or 4–20mA (with scaling function)
*Can be combined with comparative setting output 4SO
  B0 BCD output (Open collector output) *Only 0SO can be selected
  RS RS-232C *Can be combined with comparative setting output 4S
  R1 RS-485 *Can be combined with comparative setting output 4S
4.Input Signal GV Strain Gauge input (350Ω)
Zero adjustment range -1–1mV/V Span adjustment range 1–3mV/V
Measuring range: -4–4mV/V
5.Power   7 AC100–240V (±10%)
  8 DC12–48V (±10%) *Cannot be selected for B0

Dimensions (Unit: mm)

External dimensions

Connection diagram of I/O screw terminal

Connection diagram of I/O screw terminal Connection diagram of I/O screw terminal Connection diagram of I/O screw terminal Connection diagram of I/O screw terminal Connection diagram of I/O screw terminal

External control terminals

Internal circuit Pull-up at approx. 5V (Resistance value: Approx. 10kΩ)
Control signal HI 4.2–5V for the level COM terminal
Control signal LO 0–0.4V for the level COM terminal
Start hold A type: Shorting the S/H and COM terminals or making them equipotential will hold the display value.
B type: Shorting the S/H and COM terminals or making them equipotential will output the display value.
Digital zero Shorting the DZ and COM terminals or making them equipotential will turn ON the digital zero function.
Peak hold Shorting the PH and COM terminals or making them equipotential will turn ON the peak hold function.

Membership is required to use the download service.
If you have already finished registration, log in from here.

■ E-mail address
■ Password

If not yet, click here to register for membership.