PAXLPV00 Red Lion Controls, PAXLPV00 Datasheet - Page 6
PAXLPV00
Manufacturer Part Number
PAXLPV00
Description
METER PROCESS VOLT 3 1/2-DIGIT
Manufacturer
Red Lion Controls
Series
PAX®LITEr
Type
Voltmeterr
Specifications of PAXLPV00
Measuring Range
0 ~ 25 VDC
Display Style
Red Characters, Black Background
Display Type
LED
Display Face Size
3.80" L x 1.95" W (96.5 x 49.5mm)
Display Digits
3.5
Display Digits - Height
0.560" (14.22mm)
Backlight
Without
Mounting Type
Panel Mount
Termination
Screw Terminals
Voltage - Supply
85 ~ 250VAC
No. Of Digits / Alpha
3-1/2
Meter Function
DC Process
Meter Range
± 0V To ± 25V
Digit Height
14.2mm
Power Consumption
6VA
Operating Temperature Range
0°C To +60°C
Supply Voltage Ac, Min
85V
Accuracy
±0.05% %
Common Mode Rejection Ratio
100 dB
Connection Type
Cage-Clamp
Cut Out, Panel
3.62×1.77 "
Dimensions
4.2"L×3.8"W×1.95"H
Display Digit Height
0.56 "
Function
Voltage
Number Of Digits
3-1/2
Primary Type
Electronic
Range, Measurement
±25 VDC
Response Time
1 sec.
Temperature, Operating
0 to 60 °C
Voltage, Input
±25 VDC
Voltage, Supply
85 to 250 VAC
Weight
0.65 lbs.
Character Size
0.56"
Display Font Color
Red
Rohs Compliant
NA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
na, Contains lead / RoHS non-compliant
Other names
RLC113
SPAN ADJUSTMENTS
decimal points, when the input signal is varied from minimum to maximum. For
example, if a unit is to display 25.0 @ 1 V and 100.0 @ 5 V, the span is 750 (the
difference between 250 and 1000). Had the minimum display been -25.0 @ 1 V
and +100.0 @ 5 V, the span would be 1250 (1000 - (-250) = 1250). (Note: the
terms “GAIN,” “SCALE,” and “SENSITIVITY” are also frequently used
interchangeably with the term “SPAN.”) The PAX Lite Process Volt Meter can
be set up over a very wide span range by means of the coarse DIP switches S6-
S10, and the fine screwdriver adjustment pot, located at the back cover. The
coarse span switches add parallel input resistors to the summing amplifier (K2),
thereby increasing its gain, or sensitivity, as
more
Effectively, adding more parallel input
resistors increases the slope of the transfer
curve (at right) and increases the numerical
readout for a given input signal change. The
input summing resistor values are weighted in
a binary progression, so they can be switched
in combinations to give 32 discrete steps of
span. The fine adjust control brackets these
coarse steps and can be adjusted to the exact
span needed.
The values shown are “units per volt.” For example, if S6 only is turned “ON,”
the numerical readout will change approximately 550 units for a signal voltage
change of 1 volt. If S7 were also turned “ON,” the numerical readout would
change approximately 825 units for a signal voltage change of 1 volt. The span
adjust pot has a continuous span range of approximately 0- 45.
4.0 S
Span is defined as the numerical range that the display traverses, disregarding
The approximate span contributed by each switch is shown on the rear label.
summing
CALING THE
resistors
DESCRIPTION OF OPERATION
(shown above). Input voltage can be reversed in polarity resulting in negative numerical readout with a minus
(-) sign displayed. Input terminals 3 and 4 are connected to the signal voltage. The buffer amplifier (K1)
conditions and filters the input signal voltage and applies it to the input of the scaling circuit. The procedure
for scaling PAX Lite Process Volt Meters is simplified by dividing the scaling process into two separate
components, span adjustments and offset adjustments which are defined in the following discussion.
The PAX Lite Process Volt Meter consists of a digital volt meter combined with an analog scaling circuit
are
added.
M
PAXLPV SCHEMATIC
ETER
6
OFFSET ADJUSTMENTS
resistors increases the slope of the
transfer curve (at right) and increases the
numerical readout for a given input
signal
discussion of span, the transfer curves
were shown as “ZERO-BASED,” i.e.,
the numerical readout displays “0” when
the signal goes to zero. With voltage
ranges such as 0-5 V or 0-10 V, and with
Bi-Polar (+/-) signals this is often the
desired condition. However, with voltage
ranges such as 1-5 V or 1-10 V, the minimum voltage level usually represents
the zero level of the parameter being displayed. There are also many
applications where the minimum (or zero level) represents some value that does
not fall on a zero based transfer curve. To accommodate non-zero based
applications, the PAX Lite Process Volt Meter has provisions for offsetting the
transfer curve over a wide range. Essentially, offset moves the transfer curve up
or down to change its intercept with the numerical readout axis, but it does not
change the slope (SPAN) of the transfer curve. In the PAX Lite Process Volt
Meter, offset is accomplished by adding (or subtracting) a constant at the input
of the summing amplifier (K2). This offset constant is summed in with a
switched binary resistor network and a fine adjust offset control in a similar
manner to that used for span adjust. Switches S2-S5 can be turned on in
combinations to give 16 different coarse offset levels. Each switch is labeled to
show the approximate amount of offset contributed when it is turned “ON.”
Switch 1 selects the polarity of the switched-in offset value and allows
offsetting the transfer curve “UP” (adding the offset constant) or “DOWN”
(subtracting). The offset adjust pot has a numerical readout range of +/-100 and
brackets all the coarse switched ranges.
Effectively, adding more parallel input
change.
In
the
foregoing