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Datel DMS-40LCD-4/20S Manual
4 ½ D I G I T , 4 - 2 0 m A I N P U T , L O O P - P O W E R E D L C D D I S P L A Y M E T E R S
Display Reading
4mA
20mA
1. 0000
2250-2450
2. 0000
2450-2800
3. 0000
2800-3200
4. 0000
3200-3850
5. 0000
3850-4250
6. 0000
4250-4800
7. 0000
4800-5500
8. 0000
5500-6200
9. 0000
6200-6750
10. 0000
6750-7700
11. 0000
7700-8600
12. 0000
8600-9800
13. 0000
9800-10900
14. 0000 10900-12000
15. 0000 12000-12800
16. 0000 12800-14000
17. 0000 14000-15300
18. 0000 15300-16300
19. 0000 16300-17600
20. 0000 17600-19999
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.
4. If necessary, select the appropriate decimal point by setting either
SW3, SW4, SW5, or SW6 of S2 to ON (DP1, DP2, DP3, or DP4,
respectively.
NOTE: Please keep in mind the transmitter's 4mA and 20mA output
accuracy may affect display readings which are at, or very close to, the
high and low limits of the selected range. See Example #2 below and
Technical Note 1 for more information).
Examples
The examples below illustrate how to configure the meter to perform
some typical measurements. Recall that R3 and R7 must be set to their
full clockwise position before calibrating the meter.
1. Desired display readings are:
4mA = "0.000"
20mA = "3.000"
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
S1
S2
ON
ON
ON
1
1
1
2
2
3
3
4
4
5
5
6
6
1
2
3
4
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
Use DIP-switch setting #3 in Table 1 and enable decimal point DP2 by
placing SW4 of switch S2 to ON. Apply 4mA and adjust R3 so the display
reads "0.000". Apply 20mA and adjust R7 so the display reads "3.000".
2. Desired display readings are:
4mA = "0000"
20mA = "8600"
Use DIP-switch setting #11. Apply 4mA and adjust R3 so the display reads
"0000". Apply 20mA and adjust R7 so the display reads "8600". If the
transmitter's full-scale output is less than 20.0mA, it may not be possible to
adjust R7 for a reading of "8600" with setting #11. If this occurs, select
setting #12 and re-calibrate both R3 and R7 to obtain "0000" and "8600". Note
that for these display readings no decimal points are used. Set SW3, SW4,
SW5 and SW6 of switch S2 to OFF.
3. Desired display readings are:
4mA = "0000"
20mA = "10000"
Use DIP-switch setting #13. Apply 4mA and adjust R3 so the display reads
"0000". Apply 20mA and adjust R7 so the display reads "10000". For these
display readings no decimal points are used. Set SW3, SW4, SW5 and SW6
of switch S2 to OFF.
3
DMS-40LCD-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
S1
S2
ON
ON
ON
1
1
2
2
3
4
5
6
2
1
3
4
5
6
1
3
4
S1
S2
ON
ON
ON
1
2
4
1
1
2
3
3
4
5
5
6
6
1
2
3
4