The Yokogawa UM330 digital indicator with alarms is a precision alarm instrument with universal input 1/8 DIN. For excellent monitoring operability, the UM330 displays process variables on a large display. The UM330 digital indicator is also provided with four alarm setting points (or setting outputs; one is optional). A retransmission output an 15 Vdc loop power supply are provided as standard. A communication function or 24Vdc loop power supply is available as an option to the UM330 digital indicator.
Signal Computation Function

* Measure input computation: Bias addition (-100.0 to 100.0% of measured input range width), first-order lag filter (time constant off, 1 to 120 s)
* Contact input: Retains and displays maximum and minimum readings from measured variable. Resets the maximum and minimum readings.

Alarm Function

Six different types of alarms are provided. If an alarm occurs, the alarm lamp indicates it. Four (one is optional) of the six can be used as relay contact outputs.

Alarm types:

* PV high limit, PV low limit, Deenergized on
* PV high limit, Deenergized on PV low limit
* Fault diagnosis, and FAIL output

Setting ranges for process variable alarms:

* PV alarms; -100.0 to 100.0% of measured input range
* Alarm hysteresis width; 0.0 to 100.0% of measured input range width

Delay timer:

* 0.00 to 99.59 (minute, second)
* An alarm is output when the delay timer expires after the alarm setpoint is reached
* Setting for each alarm is possible.

Fault diagnosis alarm:

* Input burn out
* A/D conversion error
* TC RJC error

FAIL output: Software failure, Hardware failure

Stand-by action:

* Stand-by action can be set to make PV alarm
* OFF during start-up

Display and Operation function

* PV display:4 digit display for engineering data
* Parameter display: 4-digit digital display for various data, including parameters
* Status display: 4 alarm LEDs (AL1, AL2, AL3, AL4)
* Operation keys: Up and Down keys, increase/decrease setpoints or various parameters
* SET/ENT key: Sets setpoint data, calls or switches various parameters
* SELECT display: Allows selection and registration of frequently changed parameters from the operation parameters during operation
* Security function: An operation inhibiting mode using a password is provided