DMD4059 Series
Strain Gauge to DC Isolated Transmitter
M-5000/1114
User’s Guide
Model
DMD4059
DMD4059-DC
Power
85-265 VAC, 50/60 Hz or 60-300 VDC
9-30 VDC or 10-32 VAC
Input Range
100 Ω to 10,000 Ω bridges at 10 VDC
Up to four 350 Ω bridges at 10 VDC
Minimum: 0 to 5 mV range 0.5 mV/V sensitivity
Maximum: 0 to 400 mV range 40 mV/V sensitivity
Millivolt output range is determined by the sensor sensitivity
(mV/V) and the excitation voltage: mV/V sensitivity X excitation voltage = total mV range
Input Impedance
200 k Ω typical
Excitation Voltage
Switch Selectable: 0-10 VDC in 1 V increments
Maximum Output: 10 VDC maximum at 120 mA
Drive Capability: Up to four 350 Ω bridges at 10 VDC
Fine Adjustment: ±5% via multi-turn potentiometer
Stability: ±0.01% per °C
Sense Lead Compensation
Better than ±0.01% per 1 Ω change in leadwire resistance
Maximum leadwire resistance: 10 Ω with 350 Ω at 10 VDC
Zero Offset (Tare)
±100% of span in 15% increments
LED Indicators
Variable brightness LEDs for input/output loop level and status
Output Ranges
Voltage (10 mA max.): 0-1 VDC to 0-10 VDC
Bipolar Voltage (±10 mA max.): ±5 VDC or ±10 VDC
Current: 0-2 mADC to 0-25 mADC
Compliance, drive at 20 mA: 20 V, 1000 Ω drive
Current output can be selectively wired for sink or source
Output Linearity, Ripple & Noise
Better than ±0.1% of span, <10 mV RMS ripple and noise
Output Zero and Span
Multi-turn potentiometers to compensate for load and lead variations, ±15% of span adjustment range typical
Output Test Button
Sets output to test level when pressed
Potentiometer adjustable 0-100% of span
Response Time
70 milliseconds typical, faster response times are available
Common Mode Rejection
100 dB minimum
Isolation
1200 V RMS min.
Full isolation: power to input, power to output, input to output
Ambient Temperature Range and Stability
–10°C to +60°C operating ambient
Better than ±0.02% of span per °C stability
Power
85-265 VAC, 50/60 Hz or 60-300 VDC
DC versions: 9-30 VDC or 10-32 VAC 50/60 Hz
Power consumption: 2 to 5 W depending on number of load cells
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Description
The DMD4059 accepts an input from one to four strain gauges, bridge sensors, load cells, or pressure transducers. It filters, amplifies, and converts the resulting millivolt signal into the selected DC voltage or current output that is linearly related to the input.
The full 3-way (input, output, power) isolation makes this module useful for ground loop elimination and signal isolation.
The adjustable excitation power supply generates a stable source of voltage to drive from one to four 350 Ω (or greater) devices. Sense lead circuitry is included to cancel the effects of leadwire resistance.
Input, output, excitation and zero offset (up to ±100% of span) are field configurable. Non-interactive zero and span simplifies calibration.
A 20 VDC loop excitation supply for the output can be selectively wired to power passive mA devices.
A green input LED and a red output LED vary in intensity with changes in the process input and output signals.
An output test button provides a fixed output (independent of the input) when held depressed. The test output level is potentiometer adjustable from 0 to 100% of output span.
For latest product manuals: omegamanual.info
MADE IN
2
DMD4059 Series Strain Gauge to DC Isolated Transmitter
Range Selection
Rotary switches and a slide switches on the side of the module are used to select input and output ranges to match your application.
Switch A: Excitation voltage
Switch B: Input range
Switch C: Input offset (see table on next page)
Switch D: Output range
Switch E : Set to "V" for voltage output or
Set to "I" for current output
It is generally easier to select ranges before installing the module on the DIN rail. The tables below list available settings, ranges, and offsets. The module side label lists common ranges.
Determine how much output in millivolts the load cell will produce at full load. Multiply the manufacturer's mV/V sensitivity specification by the applied excitation voltage.
For example, a load cell rated for 3 mV/V sensitivity using 10
VDC excitation will produce an output of 0 to 30 mV for load variations from 0 to 100%.
3 mV/V sensitivity X 10 VDC excitation = 30 mV range
Excitation Voltage Setup
Refer to the sensor manufacturer's recommendations to determine what excitation voltage to use.
Excitation
10 V
9 V
8 V
7 V
Switch A
A
9
8
7 Set Excitation rotary switch A to desired excitation voltage.
After installation the excitation fine adjust potentiometer may be used to precisely trim this voltage, if desired.
6 V
5 V
4 V
3 V
6
5
4
3
2 V
1 V
2
1
0 V 0
I/O Range Selection B, C, D, E
1. From the table below, find the rotary switch combination that matches your I/O ranges and set rotary switches B, C, and D.
2. Set switch E to "V" for voltage output or "I" for current output.
3. For ranges that fall between the listed ranges use the next highest setting and trim the output signal with the zero and span potentiometers as described in the Calibration section.
DMD4059
Strain Gauge to
Excitation
A
D
E
1
2
3 4 5 6
7
B C
A
Term. #
10
11
12
13
16
6
9
3
4
Connections
Signal
Sig. Out –
Sig. Out +
Sense Lead
Sig. Input +
Exc. –
Sig. Input –
Exc. +
Power +
Power –
Input
B
D
E
1
2
3 4 5 6
7
B C
A
DC Isolated Transmitter
Offset
C
D
E
1
2
3 4 5 6
7
B C
A
Output
D
4
6
7 8
3 2
1
9
Output
V I
E
1. Set Switch A for desired Excitation Voltage.
2. Set Switches B/C/D for desired Input / Output ranges.
3. Set Switch E for Voltage or Current as required.
4. Set Excitation / Zero / Span / Test Cal. Controls
Excitation Switch
Voltage
10V
9V
8V
7V
6V
5V
4V
3V
2V
1V
0V
Position
4
3
6
5
8
7
A
9
2
1
0
INPUT
For more Details and Instructions see
Data Sheet
OUTPUT
0-5 mV0-10 mV0-20 mV0-25 mV0-30 mV0-40 mV0-50 mV0-100 mV0-200 mV0-250 mV
Rotary Switches
0-1V
0-5V
1-5V
+/-5V
0-10V
+/-10V
4-20mA
BCD
200
209
206
204
203
205
207
BCD
A00
A09
A06
A04
A03
A05
A07
BCD
300
309
306
304
303
305
307
BCD
600
609
606
604
603
605
607
BCD
E00
E09
E06
E04
E03
E05
E07
BCD
B00
B09
B06
B04
B03
B05
B07
BCD
000
009
006
004
003
005
007
BCD
800
809
806
804
803
805
807
BCD
100
109
106
104
103
105
107
BCD
400
409
406
404
403
405
407
0-30mV IN, 4-20mA OUT: CODE 0E7 Set switch “B” to 0; “C” to E; “D” to 7
Using Offset Switch C
Offset switch C allows canceling or taring of non-zero deadweights or other sensor offsets such as:
O Compensate for tare weights or scale deadweight to get zero output when a load is on the platform.
O Compensate for low-output sensors (e.g., less than 1 mV/V) that may have large zero offsets. Switch C can realign the zero control so it has enough range to produce the desired zero output.
O Raising the offset to allow calibration of bipolar sensors such as ±10 mV.
O Lowering the offset to compensate for elevated input ranges such as 10-20 mV.
1. Switch C does not interact with any other switch and is the only switch needed to correct zero offsets. Its only purpose is to adjust or cancel effects of the low end of the input range not corresponding nominally to 0 mV. Setting this switch to
“0” results in no offset.
2. To RAISE the output zero, rotate switch C from “1” thru “7”, until the Zero control can be set for your application.
3. To LOWER the output zero, rotate switch C from “9” thru
“F”, until the Zero control can be set for your application.
4. After all switches are set, repeat the calibration procedure.
Offset
% of Span
105%
90%
75%
60%
45%
30%
15%
0%
–15%
–30%
–45%
–60%
–75%
–90%
–105%
Switch C
D
E
F
B
C
9
A
1
0
3
2
5
4
7
6
Output
Switches
Input
0-5 mV
0-10 mV
0-20 mV
0-25 mV
0-30 mV
0-40 mV
0-50 mV
0-100 mV
0-120 mV
0-200 mV
0-250 mV
0-300 mV
0-400 mV
0-1 V
BCDE
0-2 V
BCDE
0-4 V
BCDE
1-5 V
BCDE
0-5 V
BCDE
0-8 V
BCDE
2-10 V
BCDE
0-10 V
BCDE
±5 V
BCDE
±10 V 0-2 mA 0-4 mA 0-8 mA 2-10 mA 0-10 mA 0-16 mA 4-20 mA 0-20 mA
BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE
200V 208V 201V 206V 209V 202V 207V 203V 204V 205V 200I 208I 201I 206I 209I 202I 207I 203I
A00V A08V A01V A06V A09V A02V A07V A03V A04V A05V A00I A08I A01I A06I A09I A02I A07I A03I
300V 308V 301V 306V 309V 302V 307V 303V 304V 305V 300I 308I 301I 306I 309I 302I 307I 303I
600V 608V 601V 606V 609V 602V 607V 603V 604V 605V 600I 608I 601I 606I 609I 602I 607I 603I
E00V E08V E01V E06V E09V E02V E07V E03V E04V E05V E00I E08I E01I E06I E09I E02I E07I E03I
B00V B08V B01V B06V B09V B02V B07V B03V B04V B05V B00I B08I B01I B06I B09I B02I B07I B03I
000V 008V 001V 006V 009V 002V 007V 003V 004V 005V 000I 008I 001I 006I 009I 002I 007I 003I
800V 808V 801V 806V 809V 802V 807V 803V 804V 805V 800I 808I 801I 806I 809I 802I 807I 803I
F00V F08V F01V F06V F09V F02V F07V F03V F04V F05V F00I F08I F01I F06I F09I F02I F07I F03I
100V 108V 101V 106V 109V 102V 107V 103V 104V 105V 100I 108I 101I 106I 109I 102I 107I 103I
400V 408V 401V 406V 409V 402V 407V 403V 404V 405V 400I 408I 401I 406I 409I 402I 407I 403I
C00V C08V C01V C06V C09V C02V C07V C03V C04V C05V C00I C08I C01I C06I C09I C02I C07I C03I
900V 908V 901V 906V 909V 902V 907V 903V 904V 905V 900I 908I 901I 906I 909I 902I 907I 903I
Electrical Connections
Check white model/serial number label for module operating voltage to make sure it matches available power.
WARNING! All wiring must be performed by a qualified electrician or instrumentation engineer. See diagram at right for terminal designations and wiring examples.
Avoid shock hazards! Turn signal input, output, and power off before connecting or disconnecting wiring. Connect I/O wiring before power wiring.
Module Power Terminals
When using DC power, either polarity is acceptable, but for consistency with similar products, positive (+) can be wired to terminal 13 and negative (–) can be wired to terminal 16.
Signal Input Terminals
Connect up to 4 strain gauges or load cells. See manufacturer’s specifications for wiring designations and wire color-coding.
Polarity must be observed when connecting inputs.
CAUTION: Never short the excitation leads together. This will cause internal damage to the module.
Some bridges may have one or two sense leads. See manufacturer’s specifications. Sense leads allow the DMD4059 to compensate for leadwire resistance effects. Observe polarity when connecting sense leads.
If no sense lead is used, jumper sense (+) terminal 6 and excitation (+) 12.
Calibration should be done after all connections are made.
Signal Output Terminals
Polarity must be observed when connecting the signal output.
The DMD4059 output can be wired to provide either a sinking or sourcing mA output. If your device accepts a current input, determine if it provides power to the current loop or if it must be powered by the DMD4059 module.
Use a multi-meter to check for voltage at your device’s input terminals. Typical voltage may be 9-24 VDC. See the wiring diagram for the appropriate connections.
DMD4059 Series Strain Gauge to DC Isolated Transmitter
3
Output Wiring
Current sinking output switch E set to “I”
External device provides power to output loop
Loop
Power
Source
+
–
1
Current sourcing output switch E set to “I”
+20 V at terminal 4
Voltage output switch E set to “V”
1
1
4-20 mA
Device
R i
+ –
– +
2 3 4
Passive
4-20 mA
Device
R i
– +20V
2
2
3 4
Voltage
Device
– +
3 4
No Sense Leads
Jumper 6 to 12 ONLY if sense leads are NOT used
Sensor shield wire
(if equipped) should be grounded at one end only
Sig
–
V 0 –
Exc +
V EX +
Strain
Gauge
V 0 +
Sig
+
5 6 7 8
OMEGA Engineering, Inc.
Excitation
Output
LED
Test Cal.
Test
V EX –
Exc –
Span
Input
LED
Zero
DMD4059
Strain Gauge to DC
Isolated Transmitter
9 10 11 12
With Sense Leads
Sensor shield wire
(if equipped) should be grounded at one end only
Sense +
Sig
–
V 0 –
Exc +
V EX +
Strain
Gauge
V 0 +
Sig
+
V EX –
Exc – Sense –
5 6 7 8
OMEGA Engineering, Inc.
Excitation
Output
LED
Test Cal.
Test
Span
Input
LED
Zero
DMD4059
Strain Gauge to DC
Isolated Transmitter
9 10 11 12
Device Connected to Output Terminal Terminal Switch E
Voltage input
Passive mA (current) input.
Module provides loop power mA (current) input device that provides loop power.
Excitation Voltage Trim
Variable Brightness Output
Indicator
Output Test Level Adjust
Push to Test Output
Output Span Calibration
Variable Brightness Input
Indicator
Output Zero Calibration
3 (–)
3 (–)
2 (–)
4
4 (+)
(+20 V)
3 (+)
V
I
I
Calibration
The Zero, Span, and Excitation potentiometers are used to calibrate the output. This calibration procedure does not account for offsets or tare weights. If your system has an offset, tare weight or deadweight, refer to the "Using Offset Switch C" procedure.
To achieve optimum results, the system should be calibrated using an accurate bridge simulator, pressure calibrator, or calibration weights depending on the application.
1. Apply power to the module and allow a minimum 20 minute warm up time.
2. Using an accurate voltmeter across terminals 10 and 12, adjust the excitation voltage potentiometer for the exact voltage desired.
3. Provide an input to the module equal to zero or the minimum input required for the application.
4. Using an accurate measurement device for the module output, adjust the Zero potentiometer for the exact minimum output signal desired. The Zero control should only be adjusted when the input signal is at its minimum.
5. Set the input at maximum, and then adjust the Span pot for the exact maximum output desired. The Span control should only be adjusted when the input signal is at its maximum.
6. Repeat the zero and span calibration for maximum accuracy.
Output Test Function
When the test button is depressed it will drive the output with a known good signal that can be used as a diagnostic aid during initial start-up or troubleshooting. When released, the output will return to normal.
The Test Cal. potentiometer can be used to set the test output to the desired level. It is adjustable from 0 to 100% of the output span.
Press and hold the Test button and adjust the Test Cal. potentiometer for the desired output level.
Installation Precautions
WARNING! Avoid shock hazards! Turn signal input, output, and power off before connecting or disconnecting wiring, or removing or installing module.
Mounting to a DIN Rail
The housing clips to a standard 35 mm DIN rail. The housing is
IP40 rated and requires a protective panel or enclosure.
1. Tilt front of module downward and position against DIN rail.
2. Clip lower mount to bottom edge of DIN rail.
3. Push front of module upward until upper mount snaps into place.
Removal
1. Push up on the bottom back of the module.
2. Tilt front of module downward to release upper mount from top edge of DIN rail.
3. The module can now be removed from the DIN rail.
Operation
Strain gauges and load cells are normally passive devices that are commonly referred to as “bridges” due to their four-resistor
Wheatstone bridge configuration. These sensors require a precise excitation source to produce an output that is directly proportional to the load, pressure that is applied to the sensor.
The exact output of the sensor (measured in millivolts) is determined by the sensitivity of the sensor (mV/V) and the excitation voltage applied.
An additional input, the sense lead, monitors the voltage drop in the sensor leads and automatically compensates the excitation voltage at the module in order to maintain a constant excitation voltage at the sensor.
The DMD4059 provides the excitation voltage to the sensors and receives the resulting millivolt signal in return. This input signal is filtered and amplified, then offset, if required, and passed to the output stage. Depending on the output configuration selected, a DC voltage or current output is generated.
The green input LED provides a visual indication that a signal is being sensed by the input circuitry of the module. It also indicates the input signal strength by changing in intensity as the process changes from minimum to maximum.
If the LED fails to illuminate, or fails to change in intensity as the process changes, check the module power or signal input wiring. Note that it may be difficult to see the LEDs under bright lighting conditions.
The red output LED provides a visual indication that the output signal is functioning. It becomes brighter as the input and the corresponding output change from minimum to maximum.
For current outputs, the red LED will only light if the output loop current path is complete. For either current or voltage outputs, failure to illuminate or a failure to change in intensity as the process changes may indicate a problem with the module power or signal output wiring.
Module Power
13 Power AC or DC +
14 Earth Ground
16 Power AC or DC –
13 14 15 16
Diagnostic Voltage Measurements
Using a meter with at least 10 megaohm input impedance, measure the voltage coming from the strain gauge at the locations shown.
Sensitivity is measured in mV/V.
Positive
Meter Lead
+ Exc.
Negative
Meter Lead
– Exc.
Meter Reading
No pressure/load
Excitation Voltage Excitation Voltage
Meter Reading
Full pressure/load
+ Sig.
– Sig.
+ Sig.
– Exc.
– Exc.
– Sig.
+ ½ Excitation Voltage
+ ½ Excitation Voltage
Zero Volts
½ Excitation Voltage + (½ x Excitation Voltage x Sensitivity)
½ Excitation Voltage – (½ x Excitation Voltage x Sensitivity)
Excitation Voltage x Sensitivity
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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without notice. WARNING: These products are not designed for use in, and should not be used for, human applications.
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase.
OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components which wear are not warranted, including but not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY
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CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic
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Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO
OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN
ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.
PATENT NOTICE: U. S. Pat. No. 6,074,089; 5,465,838 / Canada 2,228,333; 2,116,055 / UK GB 2,321,712 / Holland 1008153 / Israel 123052 / France
2 762 908 / EPO 0614194. Other patents pending.
FOR WARRANTY RETURNS, please have the following information available BEFORE contacting OMEGA:
1. Purchase Order number under which the product was PURCHASED,
2. Model and serial number of the product under warranty, and
3. Repair instructions and/or specific problems relative to the product.
FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges.
Have the following information available BEFORE contacting OMEGA:
1. Purchase Order number to cover the COST of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.
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© Copyright 2004 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.
M-5000/1114
