DATEL, Inc., Mansfield, MA 02048 (USA)
·
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
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E-mail: [email protected]
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Internet: www.datel.com
3
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
DMS-40PC-4/20S
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.
Table 1. DIP- Switch Settings
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.
Switch S2
SW3
SW4
SW5
SW6
DP1
DP2
DP3
DP4
Table 2. Decimal Point Settings
Switch S1
Switch S2
Display Reading
SW1
SW2
SW3
SW4
SW5
SW6
SW1
SW2
4mA 20mA
1. 0000 2250-2500
Off
On
On
On
Off
Off
On
On
2. 0000 2500-2800
Off
On
On
On
Off
Off
Off
On
3. 0000 2800-3200
Off
On
On
On
Off
Off
On
Off
4. 0000 3200-3850
Off
On
On
On
Off
Off
Off
Off
5. 0000 3850-4300
On
Off
On
On
Off
Off
On
On
6. 0000 4300-4900
On
Off
On
On
Off
Off
Off
On
7. 0000 4900-5600
On
Off
On
On
Off
Off
On
Off
8. 0000 5600-6200
On
Off
On
On
Off
Off
Off
Off
9. 0000 6200-6800
Off
Off
On
On
On
Off
On
On
10. 0000 6800-7750
Off
Off
On
On
On
Off
Off
On
11. 0000 7750-8600
On
On
Off
On
On
Off
On
On
12. 0000 8600-9850
On
On
Off
On
On
Off
Off
On
13. 0000 9850-11000
On
On
On
Off
Off
On
On
On
14. 0000 11000-12000
On
On
On
Off
Off
On
Off
On
15. 0000 12000-13000
On
Off
Off
On
Off
On
On
On
16. 0000 13000-14000
On
Off
Off
On
Off
On
Off
On
17. 0000 14000-15300
On
Off
On
Off
On
On
On
On
18. 0000 15300-16300
On
Off
On
Off
On
On
Off
On
19. 0000 16300-17800
Off
Off
On
Off
On
On
On
On
20. 0000 17800-20000
Off
Off
On
Off
On
On
Off
On
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.
O
perating and Setup Instructions