Martel Electronics DPM742-BL User Manual
DPM 742-BL
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4-20mA Loop Powered Indicator with Backlighting
PRODUCT DESCRIPTION
The DPM 742-BL gives an accurate, zero adjusted indication of a 4-20mA current. Calibration is by two multi-turn
potentiometers which allow sensitive adjustment of the instrument over a very wide range. Decimal points are jumper
link selectable. LED
A low drift bandgap reference circuit ensures accurate readings over a wide temperature range.
backlighting ensures excellent readability under low light conditions. Connection is via screw terminals. The module's
low cost means it will suit high and low volume applications. This module is supplied with a plastic mounting bezel. A
waterproof seal to IP67 / NEMA 4X is achievable, using the optional BEZ 700-IP metal bezel.
FEATURES
• 12.7
mm (0.5") Digit Height
• 4-20mA Loop Powered Indication
• Low Volt Drop
•
Programmable Decimal Points
•
LED Backlighting (30mA @ 5V typ.)
• Bandgap Reference
• Wide Adjustment Range
• Auto-polarity on Display
• IP67 / NEMA 4X Protection via BEZ 700-IP
ORDERING INFORMATION
Stock Number
Standard Meter DPM 742-BL
IP67 / NEMA 4X Bezel BEZ 700-IP
ELECTRICAL SPECIFICATIONS
Specification Min. Typ. Max. Unit
Accuracy (overall error) * 0.05 0.1 % (±1 count)
Linearity ±1 count
Sample rate 2.5 samples/sec
Operating temperature range 0 50 °C
Temperature stability 200 ppm/°C
Loop Volt Drop 5 5.6 V
Supply current 4 20 mA
Backlight supply voltage 4.75 5.0 ** V d.c.
Backlight supply current @ 5V d.c. 30 50*** mA
Full scale reading (@20mA) 0 1999 Count
Offset adjustment range -1900 +1900 Count
* To ensure maximum accuracy, re-calibrate periodically.
** An external series resistor is required above 5V, see Applications.
*** This specification linearly derates to 30mA @ 50°C.
LASCAR ELECTRONICS LTD.
MODULE HOUSE
WHITEPARISH
WILTSHIRE SP5 2SJ
UK
TEL: +44 (1794) 884567
FAX: +44 (1794) 884616
E-mail: sales@lascar.co.uk
LASCAR ELECTRONICS INC.
3750 West 26th Street
Erie
PA 16506
USA
TEL: +1 (814) 835 0621
PO Box 770, Londonderry, NH 03053 1-800-821-0023
FAX: +1 (814) 838 8141
E-mail: us-sales@lascarelectronics.com
www.martelcorp.com
www.lascarelectronics.com
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. BLDG.
63-65 HUNG TO ROAD
KWUN TONG KOWLOON
HONG KONG
TEL: +852 2797 3219
FAX: +852 2343 6187
E-mail: b4lascar@samsongroup.com.hk
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DPM 742-BL
DIMENSIONS
All dimensions in mm (inches)
4-20mA Loop Powered Indicator with Backlighting
34.5 (1.36)
64.5 (2.54)
Panel cut-out: 62.0 - 32.0
(2.44 - 1.26)
PANEL FITTING
Panel thickness: 1.0 - 3.0
(0.04 - 0.12)
25.0 (0.98)
53.0 (2.17)
46.7 (1.84)
60 (2.36)
2.8 (0.11) dia
30 (1.18)
17.7 (0.7)
1.6 (0.06)
6.1 (0.24)
13.0
(0.51)
Insulating
Washer
FUNCTIONAL BLOCK DIAGRAM
BL+
BL-
I+
I-
4-20mA
Vdc
8
1
Shake-proof
Washer
21
CONNECTIONS
3
(rear view)
JA JB
Offset
DP
321
Span
Lk1
I+ I- BL+ BL-
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.lascarelectronics.com
www.martelcorp.com
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