Connector Options:
MODEL LPD100
INSTALLATION AND
OPERATING MANUAL
for
4/20 mA LOOP INDICATOR
in
mm
Figure 2
Ordering Information:
Model:
LPD100
Connector Option
Calibration Range
(A,B,C,D,E) Zero/Full Scale Units of Measure
example:
LPD100A
-14.7/100 psig
Description:
LPD100 loop indicator with “A” connector option (see above)
calibrated so that the display reads -14.7 psig @ 4 mA and 100 psig @
20 mA. If the calibrated range is greater than 1999 counts, add a “K” to
the end of the model number.
Exanple: LPD100AK -14.7/2500 psig Same as above except calibrated
to display 2500 psig @ 20 mA.
K796418 Rev B
The model LPD100 loop indicator is a digital display designed to
connect directly to the Ametek HPT100 series transducer. Its purpose
is to produce a local indication of the process in either pressure, current
or percent of full scale. The display span settings and decimal positions
are factory set. The unit span and zero may be adjusted in the field with
externally accessible potentiometers.
The LPD100 is connected in series with the transducer and is powered
by the same 2 wire 4-20 mA current loop of the transducer A typical
installation attached to a transducer is shown in Figure 1.
Electrical Connections:
Typical Electrical Connections :
+
Pressure
Transducer
(HPT 100)
(+) 4-20 mA
4 to 20 mA
+
(+) 4-20 mA
100.0
A
LPD100
(-) 4-20 mA
-
Load Resistor
24 V
Power
Supply
(-) 4-20 mA
Connector Designations:
Transducer Connection
Options A-B-C-D
Power Connection
Options A-B
Pigtail Designations:
Transducer Connection
Option E only
Power Connection
Options C-D-E
RED- (+) 4-20 mA
RED- (+) 4-20 mA
BLK- (-) 4-20 mA
BLK- (-) 4-20 mA
100.0
Figure 1
The available options allow for connector to connector connections, connector to
pigtail connections or pigtail to pigtail connections. The options are illustrated in
Figure 2.
Display Position:

The LPD100 options A through D can swivel on the Bendix type connector up to
320° of rotation. This is accomplished by loosing the swivel locking nut , turning the
housing to the correct orientation, and tighten the swivel locking nut. The swivel
locking nut need only be hand tightened to prevent rotation.
Zero and Span Adjustments:
The ZERO and SPAN adjustments are marked on the top side of the indicator. With 4
mA applied to the loop, adjust the ZERO for the correct zero reading on the display.
With 20 mA applied to the loop, adjust the SPAN for the correct full scale reading on
the display. This procedure may need to be repeated until the zero and full scale
readings are correctly set.
Note: The LPD100 is a indicator of the transducer output. It
is not intended to be a calibration device and should not be
used to set the transducer output.
GRN - CHASSIS
GND
Note: Shield wire connected to chassis.
A
LPD100
GRN - CHASSIS
GND
Specifications:
SIGNAL CURRENT:............................... 4 to 20 mA, DC
OVERLOAD............................................ 60 mA forward, 75 mA reverse
VOLTAGE DROP @ 20 mA................... 3.5 Volts, Max.
DISPLAY................................................. 0.3” H, 3 ½ Digits LPD100, 4-½ Digits LPD100_K
LEAST SIGNIFICANT DIGIT ................Fixed Zero @ Least Significant Digit for LPD100_K
ZERO RANGE......................................... 20% of selected range
SPAN ....................................................... -100 to 1999 counts LPD100/-1000 to 19990
LPD100_K
OVERRANGE INDICATION ................. “1” in most significant digit, rest of digits blank
WEIGHT.................................................. 2.5 oz. max. w/o cable
MATERIAL & FINISH ........................... Clear anodized aluminum
HOUSING................................................ Face 2.08” H, 2.08” W; 1.48”min/2.75” max. D
................................................................. Face 52,8mm” x52.,8mm x; 37,6/69,9 mm D
ROTATION ............................................. 320°
ACCURACY, INCLUDING LINEARITY...............±(0.1 % F.S. + 1 count), @ 25°C
TEMPERATURE COEFFICIENT ...........................±200 PPM/°C
OPERATING TEMPERATURE ..............................-20 to +70 degree C
STORAGE TEMPERATURE...................................-40 to +85 degree C
READING RATE......................................................2.5 Readings/second