Metretek MTEK6000 Series, User Manual, Page: 30 / 81

MTEK6000 SERIES USER'S MANUAL
3-4 January 2002
Low Pressure Alarm
If the gas pressure should fall below the
Low Pressure Alarm Setpoint, a
Low
Pressure alarm will be initiated. The alarm
will remain active until the pressure rises
above the Low Pressure Reset parameter
value. The setpoints are user configurable
with default values of -100 and -80
respectively (see Appendix A for parameter
addressing for your device).
Low Supply Volts Alarms
If the supply voltage to the unit falls below
the Low Supply Volts Alarm Setpoint value,
a
Low Supply Volts alarm will be initiated.
The alarm will remain active until the
supply voltage is greater than the Low
Supply Volts Alarm Reset parameter. The
setpoints are user configurable with default
values of 2.9 and 3.1 volts respectively for
battery powered units (see Appendix A for
parameter addressing for your device).
Low Temperature Alarm
If the gas flow temperature should fall
below the Low Temperature Alarm Setpoint,
a
Low Temperature alarm will be initiated.
The alarm will remain active until the
temperature rises above the Low
Temperature Reset parameter value. The
setpoints are user configurable with default
values of -100 and -80 respectively (see
Appendix A for parameter addressing for
your device).
Lost Differential Pressure Alarm (EFM)
A
Lost Differential Pressure alarm is
generated when the differential pressure
circuitry is over-ranged. This can occur if
the differential pressure transmitter is
defective, or disconnected from the analog
board causing differential pressure readings
to be above or below the range of the
transducer.
Lost Pressure Alarm
A Lost Pressure alarm is generated when
the pressure circuitry is over-ranged. This
can occur if the pressure transducer is
defective, or disconnected from the analog
board causing pressure readings to be above
or below the range of the transducer.
Lost Temperature Alarm
A Lost Temperature alarm is generated
when the temperature circuitry is over-
ranged. This can occur if the thermal
(temperature) probe is defective, or
disconnected from the analog board causing
temperature readings to be above or below
the range of the probe.
LowVolt Shutdown
On battery powered units, if the battery
voltage decreases to approximately 2.8
volts, an interrupt will be triggered and the
unit will enter Low Voltage (Critical)
Shutdown mode.
Low batt will be
displayed on the display. This is an
indication that the supply voltage is
absolutely too low to operate the unit
properly. The battery must be changed at
this point or adequate supply voltage
applied. For units that are externally
powered, this point will occur when the
input voltage drops to approximately 6.0
volts. In this mode, all operations cease, and
the unit operates in a protective mode. The
on-board battery will continue to protect the
unit's memory; therefore data prior to
entering this mode will be maintained. The
supply voltage is monitored constantly and
the unit will reset itself should the supply
voltage become greater than 6.0 volts. If the
unit is left alone without applying adequate
supply voltage, the battery will continue to
drain and the outside display will eventually
go blank.
When sufficient supply voltage is applied
and the unit powers-up, a
LowVolt
Shutdown alarm will be recorded.