Datel DMS-40PC-4/20S-24GS-I Manuel - Page 3
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4 ½ D I G I T , 4 - 2 0 m A I N P U T , L E D D I S P L A Y M E T E R S
Display Reading
4mA
20mA
1. 0000
2250-2500
2. 0000
2500-2800
3. 0000
2800-3200
4. 0000
3200-3850
5. 0000
3850-4300
6. 0000
4300-4900
7. 0000
4900-5600
8. 0000
5600-6200
9. 0000
6200-6800
10. 0000
6800-7750
11. 0000
7750-8600
12. 0000
8600-9850
13. 0000
9850-11000
14. 0000 11000-12000
15. 0000 12000-13000
16. 0000 13000-14000
17. 0000 14000-15300
18. 0000 15300-16300
19. 0000 16300-17800
20. 0000 17800-20000
Since the DMS-40PC-4/20S uses extremely-stable thin-film chip
resistors, periodic re-calibration is typically required only in environ-
mentally demanding applications where shock, vibration and tempera-
ture extremes may have a detrimental affect on the 20-turn potentiom-
eters.
(4) Input Grounding: Except for the "-I" suffix models which feature
isolated current loop inputs, all other DMS-40PC-4/20S meters are
supplied with their 4-20mA negative-input terminals (TB1-2, "-")
internally connected to their power supply ground terminal (TB2-2,
"-V"). This single-ended input configuration is compatible with most
grounded-referenced 4-20mA transmitters.
Applications in which the DMS-40PC-4/20S and its associated 4-20mA
transmitter are connected to a common ground and the transmitter
drives two or more loads (for example, the meter is in series with a
PLC) must have the meter connected as the first device in the current
loop, that is, closest to the system ground (see Figure 2). If this
connection scheme is not possible and/or the meter must be connected
in the middle of the current loop, then'-I' suffix models must be used to
provide the required isolation between the meter's current loop input
and the power supply ground ("-V"). See Figures 2, 3, 4, and 5 for
typical loop connections.
Table 2. Decimal Point Settings
Switch S2
SW3
SW4
DP1
DP2
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · E-mail: [email protected] · Internet: www.datel.com
Table 1. DIP-Switch Settings
Switch S1
SW1
SW2
SW3
Off
On
On
Off
On
On
Off
On
On
Off
On
On
On
Off
On
On
Off
On
On
Off
On
On
Off
On
Off
Off
On
Off
Off
On
On
On
Off
On
On
Off
On
On
On
On
On
On
On
Off
Off
On
Off
Off
On
Off
On
On
Off
On
Off
Off
On
Off
Off
On
SW5
SW6
DP3
DP4
SW4
SW5
SW6
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
On
Off
On
On
Off
On
On
Off
On
On
Off
Off
Off
On
Off
Off
On
On
Off
On
On
Off
On
Off
On
On
Off
On
On
Off
On
On
Off
On
On
Using the Decimal Point Settings Table as a guide, the DMS-40PC-4/
20S's decimal points can be enabled to suit the user's particular readout
requirements. Place the selected decimal point's DIP switch to the ON
position (up) to illuminate the decimal point. The decimal points are
merely placeholders, that is, they can all be illuminated or all turned off;
they have no affect on the meter's operation and/or display readings.
perating and Setup Instructions
O
The following procedure must be performed as the first re-calibration step
every time DIP switches S1 and S2 are changed to select a new display
range. The following procedure also assumes the DMS-40PC-4/20S is
initially completely mis-adjusted, i.e., both potentiometers and both DIP
switches S1 and S2 are randomly set. When performing switch settings,
make sure that the DIP switch's small actuator is pushed up as far as it
will go to ensure that the switch is truly set to the ON (closed) position.
1. Set R7 (gain/span adjust) and R3 (zero/offset adjust) fully
clockwise, roughly 20 turns, then using the settings found in the
selected range, place the DIP switches on S1 and S2 to the
appropriate positions for the desired display reading.
2. Apply a precision 4mA input with proper polarity and adjust R3
(top 20-turn potentiometer) until the meter's display reads "0000".
3. Apply a precision 20mA input and adjust R7 (bottom 20-turn
potentiometer) until the display reads the maximum desired reading.
Repeat steps 2 and 3 to make sure the adjustments did not affect
one another.
3
DMS-40PC-4/20S
Switch S2
SW1
SW2
On
On
Off
On
On
Off
Off
Off
On
On
Off
On
On
Off
Off
Off
On
On
Off
On
On
On
Off
On
On
On
Off
On
On
On
Off
On
On
On
Off
On
On
On
Off
On