ANDERS ELECTRONICS DPM8180-2 Service Manual
digital panel meters user guid e
DPM8180-2 Process Meter
features
CE approved and marked
Large (14.2mm) red LED characters
Choice of inputs (4-20mA, 10-50mA, 1-5V, 0-10V)
Engineering read-outs e.g. pressure, flow, level
Offset and span adjustable
Adjustable sensor excitation output (5-24V dc)
Display hold facility
The DPM8180 is a low cost, high performance mains powered
signal process panel meter. Engineering units such as
pressure, flow, temperature and level can be displayed.
It has an adjustable, 5-24V dc (50mA) excitation supply for
powering transmitters and active transducers without the need
for an external supply.
User calibration is performed by adjusting DIP switches and
multi-turn potentiometers to choose the input format and set
the corresponding display values
OPERATING SPECIFICATION
Line voltage 115/230V +10%, -20%
Line frequency 50/60 Hz
Accuracy +/- 0.1% of reading +/- 1 digit
Temperature coefficient 100 PPM/C
Operating temperature 0 to 50°C
Storage temperature -10 to 60°C
Humidity below 85% RH
Power consumption 6 VA
CMRR 110dB
.
meters
anders
ELECTRICAL SPECIFICATION
Range 4-20mA 10-50mA 1-5V 0-10V
Input impedance 10 Ohms 10 Ohms 1 MOhm 1 MOhm
Maximum input 200mA 200mA 100V 100V
TERMINAL DEFINITIONS
TERMINAL SYMBOL DESCRIPTION
1 IN HI Sensor input signal high
2 IN LO Sensor input signal low
3 EX V- Excitation voltage -ve o/p
4 HOLD Connect to pin 2 to hold display
5 EX V+ Excitation voltage +ve o/p
6 n/c No connection
7 230V
8 115V AC power source
90V
DPM8000
series
RPM
8
8
8
Excitation
voltage
adjust (P1)
Offset trim (P2)
FIGURE 3 INSTALLATION DIAGRAM
DP8180-2V4 Rev. 4 09/03
ON
1234567 8
SW1
Offset
EDG
EDG
ON
1234
SW2
Span
8
FIGURE 2 CONNECTING A 2 WIRE SENSORFIGURE 1 FRONT VIEW (COVER REMOVED)
Span
trim (P3)
FIGURE 4 DIMENSIONS
STEP BY STEP INSTRUCTIONS
Remove instrument from protective plastic bag and clip
1
off front cover.
Pull off the three green safety terminals from the rear of
2
the meter. The complete panel meter assembly can now
be removed from its case by carefully levering the base of
the LED display board over the plastic retaining lug while
pushing gently on the terminal pins at the rear.
3
Select the required input format from
switches on SW3 accordingly (see fig.5). Return the meter
assembly to the case and replace the green terminals.
Decide the display range required and set the decimal
4
point using SW1(1 to 3), according to
NOTE
If your display is for example 0 - 35.0, then the
number of counts (R2) is still 350 for the calculations in
step 5 below.
For your chosen display range, apply the formulae from
5
the list below, for your chosen input format. For example,
for a 4-20mA input and display range of -100 to 500, the
lower reading R1 = -100 (at 4mA) and the upper reading
R2 = 500 (at 20mA).
Input format Offset figure (OF) Span figure (SF)
Note: the offset figure (OF) can have a negative value.
Using your value for OF, set offset switches SW1(5 to 8)
6
according to
according to the polarity of OF as indicated in
Using your value for SF, set span switches SW2(1 to 4)
7
according to
Make electrical connection to the meter with reference to
8
the Terminal Definition table on page 1.
Apply an accurate lower input signal, e.g. 4mA, and adjust
9
the offset trim potentiometer (P2) until the display reads
your R1 value
Apply an accurate upper input signal, e.g. 20mA and
10
adjust the span trim potentiometer (P3) until the display
reads your R2 value.
Repeat steps 9 and 10 until consistent readings are
11
achieved.
If you require the excitation output , measure the voltage
12
with an external voltmeter across pins 5 and 3 and adjust
to the required voltage using potentiometer P3.
When satisfied with the calibration, remove the input
13
signal,
remove all the electrical connections.
Clip the cover back on and insert the meter into the panel
14
cut-out. "Snap" the mounting clips into the side of the
case (refer to installation diagram) and tighten the fixing
screws until secure in the panel - do not over tighten!
With the meter installed in the panel, re-make the
15
electrical connections to the meter with reference to the
Terminal Definition Table on page 1. The meter is now
ready for use.
Worked Example
16
= - 87.5
Following the step by step instructions the switch
positions will be as follows
sw
1-1sw1-2sw1-3sw1-4sw1-5sw1-6sw1-7sw1-8sw2-1sw2-2sw2-3sw2-4sw3-1sw3-2sw3-3sw3-4
off off on off off off off off on off off off on on off off
Note location of components as per fig. 1.
Table 1
Table 2
4-20mA OF=(5xR1 - R2)/4 SF=(R2 - R1)/160
10-50mA OF=(5xR1 - R2)/4 SF=(R2 - R1)/400
1-5V OF=(5xR1 - R2)/4 SF=(R2 - R1)/160
0-10V OF= -R1 SF=(R2 - R1)/200
Table 4
. Set the polarity switch SW
and set the
.
Table 3
Table 5
.
.
turn off the
OF=(5xR1 - R2)/4
OR=(5x0 - 350)/4
auxiliary a.c. power supply
Input 4-20mA Display 0-35.0 Kg
SF=(R2 - R1)/160
SR=(350 - 0)/160
=2.19
1-4
.
and
FIGURE 5 PLAN VIEW SHOWING SWITCH SW3
78945 6
A to D Converter Chip
SW3
Input
format
EDG
ON
1234
123
Key to tables: 0 = switch OFF position
1 = switch ON position
TABLE 1 INPUT FORMAT SETTING
3-1
SW
4-20mA
10-50mA
1100
1 - 5V 0 0 1 0
0 - 10V 0 0 0 1
SW
3-2
SW
3-3
TABLE 2 DECIMAL POINT SELECT SETTINGS
1-1
SW
DP1100
DP2010
DP3001
SW
2-2
SW
3-3
TABLE 3 POLARITY SELECT
Polarity SW
Negative 0
Positive 1
1-4
TABLE 4 OFFSET FIGURE (OF) SETTINGS
Offset Figure SW
1-5
0 - 199 0 0 0 0
200 - 399 1 0 0 0
400 - 599 0 1 0 0
600 - 799 0 0 1 0
800 - 999 0 0 0 1
1000 - 1199 1 0 0 1
1200 - 1399 0 1 0 1
1400 - 1599 0 0 1 1
1600 - 1799 1 0 1 1
1800 - 1999 0 1 1 1
2000 - 2200 1 1 1 1
SW
1-6
SW
1-7
TABLE 5 SPAN FIGURE (SF) SETTINGS
Span Figure SW
2-1
0 - 2 0 0 0 0
2 - 4 1 0 0 0
4 - 6 0 1 0 0
6 - 8 0 0 1 0
8 - 10 0 0 0 1
10 - 12 1 0 0 1
12 - 14 0 1 0 1
14 - 16 0 0 1 1
16 - 18 1 0 1 1
18 - 20 0 1 1 1
20 - 22 1 1 1 1
SW
2-2
SW
2-3
SW
SW
SW
3-4
1-8
2-4
DP8180-2V4 Rev. 4 09/03
DQGHUV
Tel: +44 (0)20 7380 8167 Fax: +44 (0)20 7874 1908 www.anders.co.uk
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Bayham Place, London NW1 OEU UK
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