Yokogawa Digital Limit Alarm, MVHK
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MVHK Digital Limit Alarm

Brand: Yokogawa Electric Corporation
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This plug-in type Limit Alarm for DC input receives DC current or DC voltage signal. 

It is equipped with Active color PV display (PV display color changing function).
Features
  • Either 2 points of alarms (relay transfer contact [1a1b], 2 points), 4 points of alarms (relay NO contact, 4 points) or 2 points of alarms/1 point fail output can be selected.
  • An alarm status in the event of an alarm can be recognized.
  • Detects FAIL condition by self-diagnosis function (FAIL output type)
  • Equipped with easy-to-see large LED display as standard.
  • Using the economical mode enables the low power consumption operation (normal operation: approx. 0.5 W, 1 VA).
  • Input range and each parameter setting can be changed by the operation keys on the front panel.
  • Can be equipped with monitor output (1 to 5 V DC, 4 to 20 mA DC or RS-485 communication) .

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Specifications

Brand

Accuracy

  • ± 0.1 % of Output Span - Output Accuracy
  • ± 0.1 %, ± 1 % Digit of Instrument Input Range Span - Input Display Accuracy & Alarm Action Point Setting Accuracy

Alarm

  • 2 Orange LEDs for 2-Points of Alarms - Alarm Indicator Lamp
  • 4 Orange LEDs for 4-Points of Alarms - Alarm Indicator Lamp
  • High-Limit Alarm
  • Low-Limit Alarm

Communication

  • 2-Wire Half-Duplex
  • Baud Rate: 1,200, 2,400, 4,800 or 9,600 bit/sec
  • Data Length: 7-bits, 8-bits
  • EIA RS-485
  • LADDER Communication
  • Modbus ASCII/RTU
  • PC-Link Communication Protocol
  • PC-Link with Sum
  • Start-Stop Synchronization
  • Stop Bit: 1-bit, 2-bits

Consumption

  • 0.5 W, 1 VA (Normal Operation: Approximately) - Power Consumption Operation
  • 2.4 W, 110 Vdc - Power Consumption
  • 3 W, 24 Vdc - Power Consumption
  • 3.9 VA, 100 Vac - Power Consumption
  • 5.3 VA, 200 Vac - Power Consumption

Display

  • -1999 to 9999 - Input Scaling (Displayed Value)
  • 4-Digits - PV (Measured Value) Display & Data Display
  • 7-Segment - PV (Measured Value) Display & Data Display
  • Character Height of 0.35” (9 mm) - Data Display
  • Character Height of 0.53” (13.5 mm) - PV (Measured Value) Display
  • Green LED - PV (Measured Value) Display & Data Display
  • LED Display
  • Red LED - PV (Measured Value) Display

Distance

  • 1,200 metres - Max.

Electrical Connectors

  • 3-Pin 2-Piece Connector for Monitor Output
  • M3.5 Screw Terminal for Input/Output & Power Supply

Electrical Rating

  • 0.1 A at 120 Vdc - Contact Rating
  • 0.5 A at 220 Vac - Contact Rating
  • 1 A at 120 Vac - Contact Rating
  • 1 A at 30 Vdc - Contact Rating

Enclosure, Body Material

  • ABS Resin (Black), UL 94 V-0

Humidity

  • 5 to 90 % Relative Humidity, Non-Condensing - Operating Humidity Range

Input Signal

  • 0-50 mA DC
  • -10-10 Vdc

Insulation Resistance

  • 100 megaohms at 500 Vdc between Inputs, Alarm Outputs, Power Supply & Monitor Output Mutually

Materials of Construction

  • Modified Polyphenylene Oxide Resin, Including Glass Fiber (Black), UL 94 V-1 - Socket

Mounting

  • DIN Rail Mounting for Side-by-Side Mounting
  • Plug-In Typical
  • Wall Mounted

Operating Temperature

  • 0° to 50° C (32° to 122° F)

Output

  • 1-5 Vdc
  • 4-20 mA DC
  • -6 to 106 % - Output Variable Range

Output Format

  • Relay Contact - Signal Typical

Power Supply

  • 100-240 Vac/dc (-15 %, 10 %), 50/60 Hz
  • 24 Vdc ± 10 %

Power Supply Effect

  • ± 0.1 % of Span or Less for the Fluctuations within the Allowable Range of Each Power Supply Specification - Effect of Power Supply Fluctuation

Resistance

  • 1 Megaohm (100 kiloohms During Power Off) - for Voltage Input Resistance
  • 100 ohms (with External Receiving Resistor) - for Current Input Resistance
  • 2 kiloohms or more for 1-5 Vdc - Allowable Load Resistance
  • 250 ohms (with External Receiving Resistor) - for Current Input Resistance
  • 350 ohms or Less for 4-20 mA DC - Allowable Load Resistance

Resolution

  • 1 second - for Alarm ON & OFF Delay Setting Resolution
  • 1-Digit - Setting Resolution

Response Time

  • 500 milliseconds

Supply Voltage

  • 1,000 Vac/minute between (Alarm Outputs 1 & 4) & (Alarm Outputs 2 & 3) & between Inputs & Monitor Output - Withstand Voltage
  • 2,000 Vac/minute between Inputs, (Alarm Outputs 1, 2, 3, 4), Monitor Output & Power Supply Mutually - Withstand Voltage

Temperature Effect

  • ± 0.2 % of Span or Less for a Temperature Change of 10° C (50° F)

Documentation

Specification

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