Overview

The YOKOGAWA UM33A-020-11 Digital Indicator is a versatile device designed for process control applications. It includes advanced features such as signal computation functions, various alarm types, and contact I/O functionality, making it ideal for complex monitoring tasks.

Technical Specifications

Signal Computation Function

• Measured Input Computation:
  • Bias Addition: -100.0% to 100.0% of the PV input range span
  • First-Order Lag Filter: Time constant adjustable from off to 1 to 120 seconds
  • Linearizer Approximation: 10-segment linearizer with bias
• Contact Input Functionality:
  • Retains and displays maximum and minimum readings from the measured variable
  • Option to reset maximum and minimum readings

Alarm Functions

• Types of Alarm:
  • Measured value alarm
  • PV high/low limit alarm
  • PV rate-of-change alarm
  • Self-diagnosis alarm (FAIL)
• Alarm Features:
  • Alarm output action
  • Alarm stand-by action
  • Alarm latch (forced reset) function
  • Alarm hysteresis
  • Alarm ON/OFF delay timer
• Number of Alarm Settings: 8
• Number of Alarm Output Points: Up to 9 (varies by model code)

Contact I/O Function

• Functionality: Allocates input error conditions, operational conditions, alarm conditions, or other conditions to contact input and output
• Contact Input:
  • PV peak and bottom value reset
  • Latch release (ACK)
• Additional Features:
  • LCD backlight ON/OFF switch
  • PV red/white switch
  • Message interrupt displays: 1 through 4
  • Contact Output: Alarms 1 through 8, status output