Specialized manufacturer of Digital Pressure Meters and Load Cells

VALCOM CO.,LTD.

 

Small, Rapid Strain Gauge Panel Meter
VGM2A/B series


Use in combination with pressure sensors or load cells.

Industry's most compact body full of functions!!

All functions consolidated in a body of 48(W) × 24 (H) mm.

  • Scaling function [Sets the values to be displayed for actual inputs as desired.]
  • Zero shift function [Easy to adjust zero point]
  • Auto AZ function [Sets the initial measurement as zero automatically.]
  • Auto zero function [Measures from the last displayed value as "zero" (Tare)]
  • Tracking zero function [Corrects slow zero-shift internally and automatically.]
  • Auto peak hold function [Switches measurement to the peak hold mode automatically if the preset value is exceeded]
  • Analog output function [Scales the analog output range as desired.]
  • Level comparator function [Compares the level of measurements to output signals]
  • Window comparator function [Compares the measurements between two windows (areas) to output signals.] * VGM2B only
  • Control input chattering filter function [Filters chattering to prevent malfunction.]
  • Key lock protection function [Prevents incorrect setting or malfunction due to inadvertent key operations.]
  • Linearization function [Corrects the slope of the analog output or displayed value.] * VGM2A only

Level comparator function VGM2A: S1–S3, VGM2B: S1

Level comparison is made to measured values and the comparison result is
reflected to the S1–S3 output. Setpoint is set by the comparison setting(S1–S3 hereinafter, SET)
in comparison data. Hysteresis can be added to the comparison action by the hysteresis setting(HYS1–HYS3 hereinafter HYSS)

Level comparator function

Window comparator function *VGM2B only

Window comparison is made to measured values and the comparison result is
reflected to the S2 output. The window high limit setpoint is set by the comparison
data high limit setpoint(SHI) The window low limit setpoint is set by the comparison data low limit setpoint(SLO)
Hysteresis can be added to the comparison action by the hysteresis setting(HYSW)

Window comparator function

Linearizing correction function *VGM2A only

This function allows the slope of the analog output or displayed value for the sensor input to be corrected.

Linearizing correction function

Measuring block Specifications

Applicable sensor Various strain gauge sensors (120Ω–1kΩ)
Sensor power supply DC5V±10% 60mA
Measuring range ±4mV/V
Span adjusting range VGM2A: ±3.000mV/V
VGM2B: 0.001–3.000mV/V
Zero adjusting range ±1.000mV/V
Display setting range ±9999 (Decimal point can be set to any position)
Minmum measuring sensitivity 0.2µV/V/digit
(Resolution of 1000 at span of 0.2mV/V and resolution of 9999 at span of 2.0mV/V)
A/D conversion Consecutive comparison
Sampling speed Can be freely set within range of 1–1000 times/sec
Filtering Moving averaging (Can be freely set within range of OFF–256 times)
Accuracy (*1) ±0.1%F.S.±1digit (23°C±5°C, and sampling speed of less than 20 times)
±0.15%F.S.±1digit (23°C±5°C, Standard)
Temperature characteristics ± (0.005% of rdg+0.5digit)/°C
Display unit 7-segment LED (Character height 7mm red)
Over range warming Flashing at measuring limit point
  • *1 Take the accuracy of the selected pressure sensor or load cell into account.

Comparison block Specifications

Control method Computation by microcomputer
Comparison VGM2A: 3-point MOS FET relay output (Level comparator 3-point (S1–S3))
VGM2B: 2-point MOS FET relay output (Level comparator 1-point (S1),
Window comparator 1-point (S2))
S1 comparison condition High limit/low limit evaluation is freely selectable
S2 comparison condition VGM2A: High limit/low limit evaluation is freely selectable
VGM2B: GO/NG evaluation is freely selectable
S3 comparison condition *VGM2A only High limit/low limit evaluation is freely selectable
Setting range ±9999
Comparison cycle Synchronizing with sampling period
Comparison output Insulated the main ciruit by photocoupler (MOS FET relay AC/DC250V, 80mA)
Hysteresis Can be freely set within range of 1–999digit for each setpoint
Response speed 3msec. or less (1000 times/s, No filter)

Data input/output specifications

Output range corresponding to displayed value changes (Free settbale within range)
A3: 4–20mA, A4: 0–5V, A5: 0–10V
Output cycle Synchronizing with sampling period
Load resistance A3: 250Ω or less
A4: 10kΩ or more
A5: 10kΩ or more
Output accuracy ±0.5%F.S. (23±5°C) (for displayed value)
Temp. coefficient: ±200ppm/°C
Response speed 3msec. or less (1000 times/s, No filter)
Resolution A3: Approx. 45000 resolution to 4–20mA
A4: Approx. 55000 resolution to 0–5V
A5: Approx. 55000 resolution to 0–10V

External control input specifications

Electrical rating "0" level: 0–1V, "1" level: 3–5V
Input current: 5mA or less

Other common specifications

Functions Tracking zero function, zero shift function, ect.
Memory backup Using EEPRO (No. of write times guaranteed 1000,000 times 1 million)
Memory error warning Memory check is cnducted every time power is turned on to display error if detected
Operating temperature 0–50°C
Operating humidity 35–85%RH (No condensation)
Power supply DC24V±10%
Consuming current 100mA (TYP) at 24V DC
Dielectric strength For 1 min at 500VDC between power supply and other terminals
Insulation resistance More than 100MΩ at 500 VD Cbetween power supply and other terminals
Accessories Instruction manual, mounting bracket, packing, and engineering unit seal

Model Selection

Example

Selection Cheak Model Specifications
1.Model   VGM2A 3 relay output advanced Small, Rapid Strain Gauge Panel Meter
  VGM2B 2 relay output advanced Small, Rapid Strain Gauge Panel Meter
2.Comparison setting output   3SO VGM2A 3-point MOS FET relay outpu
(Level comparator 3-point (S1–S3))
  2SO VGM2B 2-point MOS FET relay output
(Level comparator 1-point (S1), Window comparator 1-point (S2))
3.Analog output specifications   A3 Analog output 4–20mA
  A4 0–5V output
  A5 0–10V output
4.Power supply 4 DC24V

Dimensions (Unit: mm)

External dimensions

Terminal connection

Terminal connection
VGM2A VGM2B
1 COM Control output common (S1 S2) 1 COM Control output common (S1 S2)
2 S1 Control output S1 2 S1 Control output S1
3 S2 Control output S2 3 S2 Control output S2
4 COM Control input common (AZ PH CLR) 4 COM Control input common (AZ CLR)
5 AZ Control input AZ 5 AZ Control input AZ
6 PH Control input PH 6 NC None
7 CLR Control input CLR 7 CLR Control input CLR
8 DC24− Power input DC24V− 8 DC24− Power input DC24V−
9 DC24V+ Power input DC24V+ 9 DC24V+ Power input DC24V+
10 SensorsA Sensor power supply +EXC 10 SensorsA Sensor power supply+EXC
11 SensorsB Sensors input −SIG 11 SensorsB Sensors input −SIG
12 SensorsC Sensor power supply −EXC 12 SensorsC Sensor power supply −EXC
13 SensorsD Sensors input +SIG 13 SensorsD Sensors input+SIG
14 SensorsE For shield wire of sensor cable 14 SensorsE For shield wire of sensor cable
15 COM Control output common (S3) 15 NC None
16 S3 Control output S3 16 NC None
17 AOUT− Analog output − 17 AOUT− Analog output −
18 AOUT+ Analog output + 18 AOUT+ Analog output +

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