DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting · BL- Negative power supply connection...
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PRODUCT DESCRIPTION FEATURES • 12.7 • 4-20mA Loop Powered Indication • Low Volt Drop • • • Bandgap Reference • Wide Adjustment Range • Auto-polarity on Display mm (0.5") Digit Height Programmable Decimal Points LED Backlighting (30mA @ 5V typ.) • IP67 / NEMA 4X Protection via BEZ 700-IP LASCAR ELECTRONICS LTD. MODULE HOUSE WHITEPARISH WILTSHIRE SP5 2SJ UK TEL: +44 (1794) 884567 FAX: +44 (1794) 884616 E-MAIL: [email protected] DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting ELECTRICAL SPECIFICATIONS No.: 695 - Page 1 of 4 www.lascarelectronics.com The DPM 742-BL gives an accurate, zero adjusted indication of a 4-20mA current. Calibration is by three multi-turn potentiometers which allow sensitive adjustment of the instrument over a very wide range. Decimal points are jumper link selectable. LED backlighting ensures excellent readability under low light conditions. Connection is via screw terminals. The module's A low drift bandgap reference circuit ensures accurate readings over a wide temperature range. 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. t i n U . x a M . p y T . n i M n o i t a c i f i c e p S ) t n u o c 1 ± ( % 1 . 0 5 0 . 0 * ) r o r r e l l a r e v o ( y c a r u c c A Linearity ±1 count c e s / s e l p m a s 5 . 2 e t a r e l p m a S C ° 0 5 0 e g n a r e r u t a r e p m e t g n i t a r e p O C ° / m p p 0 0 2 y t i l i b a t s e r u t a r e p m e T V 6 . 5 5 p o r D t l o V p o o L . c . d V * * 0 . 5 5 7 . 4 e g a t l o v y l p p u s t h g i l k c a B A m * * * 0 5 0 3 . c . d V 5 @ t n e r r u c y l p p u s t h g i l k c a B t n u o C 9 9 9 1 0 ) A m 0 2 @ ( g n i d a e r e l a c s l l u F t n u o C 0 0 9 1 + 0 0 9 1 - e g n a r t n e m t s u j d a t e s f f O A m 0 2 4 t n e r r u c y l p p u S ORDERING INFORMATION Stock Number L B - 2 4 7 M P D r e t e M d r a d n a t S IP67 / NEMA 4X Bezel BEZ 700-IP LASCAR ELECTRONICS INC. 4258 WEST 12th STREET ERIE PA 16505 USA TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141 E-MAIL: [email protected] * 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. Specifications liable to change without prior warning DPM 742-BL Issue 7 04/2018 C.H. Applies to DPM 742-BL/3 LASCAR ELECTRONICS (HK) LTD. 8th FLOOR, CHINA AEROSPACE CENTRE, 143 HOI BUN ROAD, KWUN TONG, KOWLOON, HONG KONG TEL: +852 2389 6502 FAX: +852 2389 6535 E- mail: [email protected]
Transcript of DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting · BL- Negative power supply connection...
PRODUCT DESCRIPTION
FEATURES• 12.7• 4-20mA Loop Powered Indication• Low Volt Drop••• Bandgap Reference• Wide Adjustment Range• Auto-polarity on Display
mm (0.5") Digit Height
Programmable Decimal PointsLED Backlighting (30mA @ 5V typ.)
• IP67 / NEMA 4X Protection via BEZ 700-IP
LASCAR ELECTRONICS LTD.MODULE HOUSEWHITEPARISHWILTSHIRE SP5 2SJUKTEL: +44 (1794) 884567FAX: +44 (1794) 884616E-MAIL: [email protected]
DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting
ELECTRICAL SPECIFICATIONS
Page 2 of 4No.: 695 - Page 1 of 4www.lascarelectronics.com
The DPM 742-BL gives an accurate, zero adjusted indication of a 4-20mA current. Calibration is by three multi-turnpotentiometers which allow sensitive adjustment of the instrument over a very wide range. Decimal points are jumperlink selectable. LEDbacklighting ensures excellent readability under low light conditions. Connection is via screw terminals. The module's
A low drift bandgap reference circuit ensures accurate readings over a wide temperature range.
low cost means it will suit high and low volume applications. This module is supplied with a plastic mounting bezel. Awaterproof seal to IP67 / NEMA 4X is achievable, using the optional BEZ 700-IP metal bezel.
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ORDERING INFORMATIONStock Number
LB-247MPDreteMdradnatSIP67 / NEMA 4X Bezel BEZ 700-IP
LASCAR ELECTRONICS INC.4258 WEST 12th STREET
ERIEPA 16505
USATEL: +1 (814) 835 0621FAX: +1 (814) 838 8141
E-MAIL: [email protected]
* To ensure maximum accuracy, re-calibrate periodically.** An external series resistor is required above 5V, see Applications.
*** This speci�cation linearly derates to 30mA @ 50°C.
Speci�cations liable to change without prior warning DPM 742-BL Issue 7 04/2018 C.H. Applies to DPM 742-BL/3
LASCAR ELECTRONICS (HK) LTD.8th FLOOR, CHINA AEROSPACE CENTRE,
143 HOI BUN ROAD,KWUN TONG, KOWLOON,
HONG KONGTEL: +852 2389 6502FAX: +852 2389 6535
E- mail: [email protected]
Lk1 DP3 2 1
JA JB
I+ I- BL+ BL-Span
O�set
DIMENSIONSAll dimensions in mm (inches)
CONNECTIONS (rear view)FUNCTIONAL BLOCK DIAGRAM
Page 2 of 4No.: 695 - Page 2 of 4
1 8
I+
I-
BL-
BL+33R
Panel thickness: 1.0 - 3.0(0.04 - 0.12)
Panel cut-out: 62.0 - 32.0(2.44 - 1.26)
64.5 (2.54)
)63.1(5.43
PANEL FITTING
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4-20mA
Vdc
1.6 (0.06)
13.0(0.51)6.1 (0.24)
60 (2.36)
46.7 (1.84)
55.0 (2.17)
)7.0(7.71
)89.0(0.52
)81.1(03
2.8 (0.11) dia
DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting
3
Shake-proofWasher
21
InsulatingWasher
)35.0(5.31
)23.0(52.8
Speci�cations liable to change without prior warning DPM 742-BL Issue 7 04/2018 C.H. Applies to DPM 742-BL/3
1.6(0.06)
6.1(0.24) 13 (0.51)
9.8(0.39)
1.3(0.05)
OFFSET
SPAN(FINE)
SPAN
10.2
5 (0
.40)
16.5
(0.6
5)
22.7
5 (0
.90)
SCREWTERMINAL FUNCTIONS
CALIBRATION
I+ Positive current input.I- Negative current input.BL+ Positive power supply connection to the LED backlighting.BL- Negative power supply connection to the LED backlighting.
The meter is supplied calibrated to read 000 for 4mA loop current and 1000 for 20mA.
CIRCUITDIAGRAM
No.: 695 - Page 3 of 4www.lascarelectronics.com
To re-calibrate, place the Jumper Link across LK1. This disables the O�set adjustment to enable Span adjustment to be made �rst. AfterSpan adjustment is complete, the Jumper Link is removed and the O�set adjustment is made. The Jumper Link is then used to display oneof the decimal points if necessary.
Example to re-calibrate: Meter to read -40.0 at 4mA and 150.0 at 20mA.
1. Calculate the Span by subtracting the desired reading at 4mA from the desired reading at 20mA: 1500 - (-400) = 19002. Place Jumper Link Lk1 with the link header normally used to select the desired Decimal Point.
Link Lk1 is located to the left of the screw terminals.3. Apply 16mA between the + and - screw terminals.4. Set the Fine Span control to approximately mid-way. Set the Coarse Span adjustment to give a reading of
5. Remove Jumper Link Lk1 and place it back on the desired Decimal Point (DP1 in this case).6. Apply 4mA between the - and + screw terminals.7. Adjust the O�set potentiometer so the DPM 742-BL indicates the desired reading at 4mA: -40.08. Adjust Span and O�set as necessary for optimum accuracy. First apply 20mA and adjust Span untill
the reading is 150.0. Then apply 4mA and adjust O�set untill the reading is -40.0.Repeat step 8 until correct readings are obtained at 4mA and at 20mA.
O�set
Span
DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting
Speci�cations liable to change without prior warning DPM 742-BL Issue 7 04/2018 C.H. Applies to DPM 742-BL/3
1900. Use the Fine Span control as necessary to get a precise reading.
*By applying one link across A-B, C-D, E-F or G-H, the O�set range can be altered.
OFFSET
SPAN(FINE)
SPAN
OFFSET
SPAN(FINE)
SPAN
*
JUMPER LINKSDP1 Displays decimal point DP1 (199.9).DP2 Displays decimal point DP2 (19.99).DP3 Displays decimal point DP3 (1.999).Lk1 Used during calibration (see above).
DP 3 2 1DP 3 2 1
DP 3 2 1
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APPLICATIONSThe DPM 742-BL is powered from the 4-20mA signal loop and needs no other power supply. The LED backlighting requires aseparate d.c. power supply. Ensure correct polarity when connecting.
Measuring a 4-20mA loop current.
Measuring a 4-20mA loop currentwith other devices in the loop.
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4-20mATransmitter
4-20mATransmitter
I+ I+I+
I- I-I-
DPM 742-BL
I+
I-
DPM 742-BL
Measuring a 4-20mA loop current with LEDBacklighting switched on.
If the backlighting supply voltage (V+ - 0V) = 5V,then no resistor R is required, and connect BL- to 0V.
Note:
4-20mATransmitter
I+I+ BL+
V+
0V
I-I- BL-
DPM 742-BL
S
R R =30mA
V+ - 5V
OtherDevice
1
OtherDevice
2
DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting
Speci�cations liable to change without prior warning DPM 742-BL Issue 7 04/2018 C.H. Applies to DPM 742-BL/3
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