CiDRA SONARtrac HD VF-100 User Manual

Page 82

Page 10-7

20638-02 Rev 01

The following is an example of Pulse settings applied to Total Flow:

Output: Total Flow

Flow Rate: 400 gal/min
Pulse Output: Totalizer

Multiplier: 10

Pulse Width: 1 ms

Low cutoff: 0% or 270.1 gal/m (no cutoff)

In the above example, Pulse output would be 400 gpm / 10 = 40
pulses per minute.

•

Alarm

The transmitter alarm is a tri-state output. The Alarm modes are ‘Off’
(no alarm conditions present) indicated by the transmitter mounted
LED off and no signal being sent to the DCS, ‘Warning’ (an alarm
condition has entered a range of condition(s) where the integrity of
readings may be suspect) indicated by the transmitter mounted LED
and alarm output relay blinking, and ‘Critical’ (an alarm condition in
which the output of the meter can no longer be considered valid)
indicated by the alarm LED on the transmitter being constantly on and
constant relay closure output to the DCS. The measurement result
should be discarded and closed loop controls switched to manual
during a critical alarm.

The alarm can be cancelled either manually or will clear automatically
when the alarm condition is no longer present depending on the menu
option selected (see below).

The following table lists the alarm parameters with their default values.

Alarm Parameter

Condition

User

Entry

Warning

Default Value

Critical

Default Value

TMP>

> 80 °C

> 90 °C

Band Temperature

TMP<

< 0 °C

SPL>

> 200 dB

RMS Sound Pressure
Level

SPL<

< 50 dB

< 80 dB

Volumetric Flow Quality

VFQ<

< 0.3

< 0.2

Event log updated

LOG

Sensor overload

OVL

FLW>

> 30 ft/s

Volumetric Flow or True
Liquid Flow

FLW<

< 3.2 ft/s

< 3 ft/s

Sensor Failure

FAIL

Table 16

Alarm Triggers

Note: The alarm trigger for Flow (VF or TLF) can be set from the
transmitter menu. All other values must be set using SONARtrac
Basic (or higher level) user program.