EB-LP Datasheet, PDF (1/2 Pages) Murata Manufacturing Co., Ltd. – 4-20mA Current Loop Application Board for DMS-30LCD Meters

®
®
www.datel.com
Actual Size
DMS-EB-LP
4-20mA Current Loop
Application Board for
DMS-30LCD Meters
Features
• Loop-powered, no external
supply required
• Includes gain (span) and offset (zero)
adjustments
• Range and decimal point settings are
DIP-switch selectable
• Covers hundreds of different ranges
• Reliable screw-terminal connections
• Low cost
Functional Specifications
(TA = +25°C)
Full Scale Input
4mA to 20mA
Voltage Drop
7.5V, maximum
Input Resistance
550Ω, nominal
Accuracy
±0.05%FS ±1 count
Operating Temperature Range
0 to +60°C
Temperature Drift
±100ppm/°C, typical
Storage Temperature Range
–20 to +75°C
Humidity
0 to 95%, non-condensing
Dimensions
2.02" (51.31mm)L x 0.83" (21.08mm)W
TB1 Wire Size and Strip Length:
18 to 26 AWG (solid or stranded)
Strip Length 0.20" (5.08mm)
Technical Notes
Description: The DMS-EB-LP was specifically designed for 4-to-20mA current-loop
process-monitoring applications. The board simply mounts onto the rear of a DMS-
30LCD-1-5, allowing both the application board and the meter to be powered solely from
the 4-to-20mA loop input. Align pin 1 of the board with pin 1 of the DMS-30LCD-1-5 and
simply solder the two assemblies together.
Features: Gain (span) and offset (zero) adjustments are both performed using precision,
22-turn potentiometers. Decimal point selections and range changes are all made on an
eight-position DIP switch featuring gold-plated contacts — there are no cumbersome
jumpers or solder gaps to contend with! Connections to the loop are made via a reliable,
screw-type terminal block. The only assembly tool required is a screwdriver!
Applications: The DMS-EB-LP's design accommodates hundreds of different display
reading combinations. This essentially
eliminates the need to order "specials" in
applications in which several different-
range meters are required. OEM
customers should consider using
DATEL's new DMS-30LCD-4/20S which
already has the DMS-EB-LP soldered to
a rugged DMS-30LCD-1-5 digital
12
D1
ON
R10
R3
SW1
Zero
Adjust
1 2345 678
C2
R12
R7
Gain
Adjust
R6
R9 _TB1
R1 R8
+–
SG9
RJ4
SG10
U1
TB2
C3 C1
12
D2
voltmeter.
12
(–) INPUT LO
11
(+) INPUT HI
ANALOG ¹⁰
COMMON
9
8
7
REF. IN
R4
R5
2.21k
698
R7
2k
Gain Adjust
D2
RLZ5231
R2
2.94k
C3
2.2µF, 10V
RJ4
R6
0
90.9
8
V+
2
CAP+
V–
C1
2.2µF
1
BOOST
U1
5
10V
4
CAP–
R10
10k
C2
GND
2.2µF
10V
3
D1
LM4041
1 _+5V
SUPPLY
2
3 _5V
RETURN
4
DP3
5
DP2
6
DP1
ON
R12
SW1
5k
1 2345678
R1
90.9
Ordering Information
DMS-EB-LP
DMS-BZL1
DMS-BZL2
Current loop board
Bezel assembly
Bezel assembly with
sealing gasket
1 2 TB1
+
–
LOOP
INPUT
LOOP
RETURN
4-20mA
R8
26.7
R9
10.5
R3
5k
Zero Adjust
Figure 1. DMS-EB-LP Schematic Diagram
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com