Honeywell VPR100 User Manual page 102

Programming Function Blocks and Features
Prompt
RANGE HIGH
TEMPERATURE
UNIT
DIRECT/INDIRECT
CIRCUIT LOW
CIRCUIT HIGH
ELECTRICAL UNITS
LAG
86
Table 4-6 Standard Algorithm Prompts (continued)
Range/Selections
The value must be within the limits
specified for the input type (see Table
1-3). Be sure to use the correct value
for the temperature units used (°F, °C,
K, °R). To enter the full range for the
temperature units selected (see
TEMPERATURE UNITS), select TYPE
again and press Enter without changing
the range type.
Select C for Degrees Celsius, F for
Degrees Fahrenheit, K for Kelvin, R for
Rankine, or NONE.
Select DIRECT for thermocouple,
pyrometer, or RTD inputs. Select
INDIR (Indirect) for volt or millivolt
signal inputs from linear or non-linear
transmitters. Select SQRT (Square
Root) for extracting flow measurements
from a voltage input representing
differential pressure measurements. If
SQRT is chosen, the RANGE LOW and
RANGE HIGH must be adjusted to
specify the upper and lower limits of the
flow units span.
OFF or number
OFF or number
Select whether the CIRCUIT LOW or
CIRCUIT HIGH values specified are in
units of VOLTS, MV (millivolts), or
OHMS.
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VPR & VRX – User Manual
Definition
High end of the input range.
Specifies the temperature units used for
thermocouple, pyrometer, and RTD input
types. The default setting is F. If you
change the default, be sure to change the
analog input's RANGE LOW and RANGE
HIGH values accordingly. The instrument
will not adjust these values by itself.
Ignore the TEMPERATURE UNIT prompt
or set it to NONE, if the analog input being
programmed will not be used for
temperature measurements.
Note that the term "direct" generally applies
to input types where the sensors in direct
physical contact with the monitored
process are also in direct physical contact
with the instrument terminal board. The
term "indirect" applies to inputs from
transmitters since the sensors in direct
physical contact with the monitored
process are indirectly connected to the
instrument through the transmitter circuitry
and wiring.
Appears only if "INDIR" or "SQRT" was
previously selected. Is the actual low end
value of voltage to be used for Indirect
measurements.
Appears only if "INDIR" or "SQRT" was
previously selected. Is the actual high end
value of voltage to be used for Indirect
measurements.
Circuit low and circuit high units.
"LAG" is a time constant applied to the
input measurement value. This provides
digital filtering (LAG) to the measurement.
Lag appears on menu only if EXPANDED
INPUT is enabled under Enable Features
in the Program menu.
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