OMEGA OMEGA LDX-4 Signal Converter User Manual

User’s Guide
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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
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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.
LDX-4
M-1128/0505
1.0: Index
Section
Title
Index . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.6.1
Voltage Connections. . . . . . . . . . . . . . . 11
2.0
Safety Information . . . . . . . . . . . . . . . . 3
4.6.2
Current Connections . . . . . . . . . . . . 12
3.0
Introduction . . . . . . . . . . . . . . . . . . . . . 5
4.7
Using an EMC Cable Gland . . . . . . . . 13
3.1
LDX-4 Enhancements . . . . . . . . . . . . 5
5.0
Setting up the Transducer and LDX-4 . . . 14
4.0
Installation . . . . . . . . . . . . . . 6
5.1
Links Explained . . . . . . . . . . . . . 15
4.1
Mounting . . . . . . . . . . . . . . 6
5.2
Basic Procedure . . . . . . . . . . . . . . . . 16
4.2
Operational Environment . . . . . . . . . . . . . . 7
5.3
Sensitivity and the X2, X4, DIV2 Links . . . . 20
4.2.1
Residential, Commercial & Light Industrial
6.0
Half-Bridge Version . . . . . . . . . . . . . . 20
Environments . . . . . 7
7.0
Specifications . . . . . . . . . . . . . . . . 22
4.2.2
Industrial Environments . . . . . . . . . . . . 7
7.1
Electrical . . . . . . . . . . . . . . . . . . . . . 23
4.3
Electrical Connections . . . . . . . . . . . . . . 8
7.2
Mechanical and Connections . . . . . . . . . 24
4.4
Connecting the Transducer . . . . . . . . . . 10
7.3
Environmental. . . . . . . . . . . . . . . . 24
4.5
Connecting the Power Supply . . . . . . . . . 11
7.4
Notes . . . . . . . . . . . . . . . . . . . .25
4.6
Connecting the Signal Out . . . . . . . . 11
Section
Title
1.0
LDX-4
Page
2
Page
M-1128/0505
2.0: Safety Information
Terms in this Manual
WARNINGS:
WARNING statements identify conditions or practices
Do not operate in explosive atmosphere
that could result in personal injury or loss of life.
To avoid explosion, do not operate this equipment in
an explosive atmosphere.
CAUTION statements identify conditions or practices
Safety Critical Environments
that could result in damage to the equipment or other
This equipment is not intended for use in a safety
property.
critical environment.
CAUTION:
Low Voltage
This equipment operates at below the SELV and is
Symbols in this manual
therefore outside the scope of the Low Voltage
This symbol indicates where applicable
Directive.
cautionary or other information is to be found.
This equipment is designed to work from a low
voltage DC supply. Do not operate this equipment
outside of specification.
LDX-4
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2.0: Safety Information
CAUTION:
Electrostatic Discharge
This equipment is susceptible to ESD (Electrostatic Discharge) when being installed or adjusted, or whenever the case
cover is removed. To prevent ESD related damage, handle the conditioning electronics by its case and do not touch the
connector pins. During installation, follow the guidelines below.
- Ensure all power supplies are turned off.
- If possible, wear an ESD strap connected to ground. If this is not possible, discharge yourself by touching a
metal part of the equipment into which the conditioning electronics is being installed.
- Connect the transducer and power supplies with the power switched off.
- Ensure any tools used are discharged by contacting them against a metal part of the equipment into which the
conditioning electronics is being installed.
- During setting up of the conditioning electronics, make link configuration changes with the power supply turned off.
Avoid touching any other components.
- Make the final gain and offset potentiometer adjustments, with power applied, using an appropriate potentiometer
adjustment tool or a small insulated screwdriver.
LDX-4
4
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3.0: Introduction
The LDX-4 MK2 is a development of the original LDX-4. It is a compact conditioning module powered from a single DC
supply. Adjustable gain and zero controls are provided for use with the complete range of Omega transducers. The unit
is of robust construction, housed in a die cast aluminium box providing a substantial degree of mechanical protection.
The LDX-4 MK2 incorporates its own voltage regulation for operation from 10-30 VDC and can provide outputs of up to
±10 V together with ±20 mA.
3.1: LDX-4 Enhancements
The LDX-4 MK2 has been designed as a form, fit and function replacement for the original LDX-4, but with several
enhancements.
- Wider gain range, allowing ALL Omega transducers to be connected without the need for attenuation resistors.
- Up to ±10 VDC and ±20 mA are available for all gain settings.
- Fixed and variable offsets make setting of uni-polar output easier.
- Gain and offset adjustment are fully independent.
- Selectable transducer excitation frequency.
- Selectable transducer load resistances.
- Selection between forward and reverse connection.
- Fully CE Compliant.
- Half-Bridge transducers can now be accommodated with simple plug wiring changes.*
* For half-bridge only variant see section 6.0.
LDX-4
5
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4.0: Installation
4.1: Mounting
The LDX-4 may be mounted in a variety of ways and in any attitude. Ensure that there is enough space for the cover to
be removed to allow for internal adjustments. Space should also be allowed for the transducer connector, EMC glands
(if fitted) and cabling. It is recommended that the LDX-4 case be connected to earth or chassis. This earth connection is
not a safety earth, but is part of the overall electrical screening scheme.
Underside Mounting
Top-Side Mounting
Note: If replacing LDX-4
MKI a retrofit mounting kit
is available if
repositioning holes is not
possible.
LDX-4
6
M-1128/0505
4.0: Installation (continued)
4.2: Operational Environment
This section discusses the type of installation required depending on the electrical environment.
4.2.1: Residential, Commercial and Light Industrial Environments
Typically, this will be an office, laboratory or industrial environment where there is no equipment likely to produce high
levels of electrical interference, such as welders or machine tools.
Connections may be made using twisted, unscreened wire. This is a cost effective option and will give good
performance in this environment.
Standard equipment wire such as 7/0.2 (24AWG) can be twisted together as required. Standard data cable such as
generic CAT5 UTP will also give good performance.
4.2.2: Industrial Environments
Typically, this will be an industrial environment where there is equipment likely to produce high levels of electrical
interference, such as welders, machine tools, cutting and stamping machines.
Connections should be made using screened cable. Braided or foil screened cables may be used. The cable screen
should be connected to the LDX-4 case at cable entry point. The case of the LDX-4 should be connected to a local
ground. An EMC cable gland is recommended. This is supplied with the LDX-4.
When selecting the type of wire or cable to be used, consider the following parameters:
- Screening.
- Conductor size (resistance).
- Mechanical aspects such as flexibility and robustness.
This is not a complete list. Installations may require other special cable characteristics.
LDX-4
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M-1182/1004
4.0: Installation (continued)
4.3: Electrical Connections
The LDX-4 requires three connections.
1.
Transducer.
2.
Power Supply.
3.
Output Signal, Voltage or Current.
A small hole should be made in the grommet prior to passing the wires through. If a screened cable is to be used, an
EMC cable gland is recommended (see section 4.7).
For best performance in electrically noisy environments, the case of the LDX-4 should be connected to a local earth.
This can be achieved via the mounting bracket. This earth connection is not a safety earth, but is part of the overall
electrical screening scheme.
The wiring layout arrangements are similar for LDX-4 fitted with EMC glands and screened cable.
Power Supply
Signal Out
FINE GAIN
Transducer
FINE OFFSET
NULL
OUTPUT
FREQ
LO COARSE GAIN
(ON) 1 2 3 4 5 6 (7)
HI
(OFF)
+VE
POWER
0V
V OUT 0V I OUT
Separate Power Supply and Signal Out wires
-VE
+VE
5V
10V
COARSE
OFFSET
G
BK
W
R
B
10K
2K
-¦R¦
|F|
-DIV 2
X2
X4
LDX-4
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M-1128/0505
4.0: Installation (continued)
4.3: Electrical Connections
Power Supply and Signal Out wires from one end only
Signal Out
Transducer
FINE GAIN
FINE OFFSET
NULL
Power Supply
OUTPUT
FREQ
LO COARSE GAIN
(ON) 1 2 3 4 5 6 (7)
HI
(OFF)
+VE
POWER
0V
V OUT 0V I OUT
Connections to the power supply should be routed to one side as shown. This helps to reduce interference between
power supply wires and the more sensitive parts of the circuitry.
-VE
+VE
5V
10V
COARSE
OFFSET
G
BK
W
R
B
10K
2K
-¦R¦
|F|
-DIV 2
X2
X4
LDX-4
9
M-1128/0505
4.0: Installation (continued)
4.4: Connecting the Transducer
Transducers fitted with a 5-pin DIN plug are simply screwed into the case mounted socket. Transducers not fitted with a
plug should be wired to the plug supplied. For the half-bridge only variant see section 6.0.
Blue
Green
Secondary Centre Tap
Red and White
In Phase for Inward
Displacement
Black
Transducer Body Ground
CORE
VA
Green and White Signal
Yellow
Half-Bridge Electrical Connections
Energising
Primary
Red and Blue
Blue
Ve
Yellow
Measured
Output
Energising
Yellow
Signal
VA
In Phase for Inward
Red and Yellow
Displacement
Centre Tap
VB
Red and Blue
CORE
LVDT Electrical Connections
VO
Black
Yellow
Centre Tap
VO
Transducer Body Ground
VB
Red
Red
White
Standard LVDT Gauging Probe Plug Connections
Standard Half-Bridge Gauging Probe Plug Connections
Black
Black
Cable Screen
Cable Screen
Blue
LVDT
Half-Bridge
Case
White
Blue
3
+
4
2
4
2
5
1
Yellow
5
1
-
Green
Red
Red
Plug view
into pins
Case
Note 1: + indicates inward movement of the tip.
Note 2: The transducer body may be disconnected from the cable screen by
cutting the black wire inside the connector
LDX-4
Case
3
+
Yellow
Case
LINK
Plug view
into pins
Note 1: + indicates inward movement of the tip.
Note 2: The transducer body may be disconnected from the cable screen by
cutting the black wire inside the connector
10
M-1128/1005
4.0: Installation (continued)
4.5: Connecting the Power Supply
The LDX-4 requires a dc power supply in the range 10-30 V. A fully regulated supply is not required, but the voltage at
the input to the LDX-4 must remain within specification. Ideally, the 0 V at the power supply should not be connected to
earth or the chassis, as this would result in ground loops being formed. The 0 V supply, 0 V signal and case are all
internally connected together at the LDX-4.
4.6: Connecting the Signal Out
The output signal may be voltage or current.
4.6.1: Voltage Connections
Voltage can easily be monitored using a variety of instrumentation such as voltmeters. Voltage drops along wires
contribute to measurement errors, so care must be taken when using long cable lengths (100 m for example). High
impedance instruments are more prone to interference.
Power Supply
+ 10-30 V
0V
Process Monitor
Iout
0V
Vout
0V
+VE
+
Voltage
The signal 0 V should always be used as reference. If power supply 0 V is used, then error voltages may be introduced.
LDX-4
11
M-1128/0505
4.0: Installation (continued)
4.6.2: Current Connections
Current output requires the use of purposely designed current input instrumentation. Current output is more suitable for
transmitting over longer distances because current is not lost due to wiring resistance. Additionally, with a low
impedance, a current loop is less likely to pick up noise.
Process Monitor
Power Supply
+
+ 10-30 V
0V
Iout
0V
Vout
0V
+VE
Current
The total loop resistance (resistance of measuring equipment and wiring) must not exceed specification.
Note: The LDX-4 is not loop-powered, so a power supply must not be used in-line with the current output.
LDX-4
12
M-1128/0505
4.0: Installation (continued)
4.7: Using an EMC Cable Gland
To ensure the cable screen is properly connected to the LDX-4 case, an EMC cable gland should be used. This is
supplied as an optional extra. The diagrams below assume a single 4-way cable is being used. Remove the grommet
and fit the cable gland as shown below.
30 mm
10-15 mm
125 mm
Rotate Gland Body
to Tighten
Screen
Case Wall
- Prepare cable as shown.
Sealing
Ring
- Slide the Dome nut, sealing ring and plastic insert over cable.
Rolled Back Screen
- Fold and roll the screen back over itself to form a lump.
- Push cable into gland body followed by the plastic insert
(ensure anti-rotation slots engage), sealing ring and Dome nut.
- Ensure all components are properly seated before tightening
the dome nut.
LDX-4
13
Dome
Nut
Plastic
Insert
Gland
Body
M-1128/0505
5.0: Setting up the Transducer and LDX-4
The LDX-4 may be set-up with output signals anywhere within a ±10 VDC or ±20 mA range. Typical outputs are
±10 Vdc, ±5 VDC, 0-10 VDC and 4-20 mA. These procedures apply to voltage and current output.
Voltage and current output are available at the same time, although they cannot be individually adjusted. Either voltage
or current should be chosen as the calibration reference.
All outputs use 0 V signal as the signal reference.
A list of standard link settings is available, see section 5.2.
CAUTION:
During installation and adjustment, the top of the enclosure has to be removed for access to user adjustments.
At this time, standard ESD handling precautions for electronic equipment should be followed.
LDX-4
14
M-1128/0505
5.0: Setting up the Transducer and LDX-4 (continued)
5.1: Option Links - Explained
The table below and subsequent diagrams explain the link functions and show the factory setting.
Link
Options
Standard Setting
1 link on Positron 1 to 6
Link ON Position 1
Course Gain
Description
Sets the basic gain
Fine Gain
Adjustment between course gain ranges Potentiometer Adjustment
Mid Position
Course Offset
Shifts the output by a fixed amount
No offset - Links Parked
Fine Offset
Fine trim around any fixed offset
Link ON -VE or +VE and Link ON 5V or 10V
No offset - Link Parked
Potentiometer Adjustment
(7) Null
Used during set-up to null output
ON, OFF
OFF
Freq.
Selects transducer primary frequency
Mid Position
Hi Freq. - Link Parked
100kΩ Parked, 10kΩ - ON, 2kΩ - ON
100KΩ - Link Parked
Polarity (FR)
Enables output signal direction change
2 Links across Forward or Reverse
F Position - 2 Link ON
Input Gain
Input Gain of x1, x2, x4 or divide 2
X1 - Parked, X2 - ON, X4 - ON, DIV2 - ON
Link parked on X2
FINE GAIN
FINE OFFSET
NULL
OUTPUT
FREQ
LO COARSE GAIN
(ON) 1 2 3 4 5 6 (7)
HI
(OFF)
+VE
POWER
0V
V OUT 0V I OUT
Lo - ON, Hi - Parked
Input Resistance Sets transducer secondary load
-VE
+VE
5V
10V
Link ON
Link PARKED
COARSE
OFFSET
Link OFF
G
BK
W
R
B
10K
2K
-¦R¦
|F|
-DIV 2
X2
X4
LDX-4
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M-1128/0505
5.0: Setting up the Transducer and LDX-4 (continued)
5.2: Basic Procedure
To set-up the LDX-4, some basic steps should be followed.
The following steps describe a typical setting procedure and applies to most applications. Other procedures may be
used as appropriate.
Step 1
Step 2
Set-up LDX4 links
Align LDX-4 and
Transducer Null
V/V
±V
Hz
Ω
KΩ
Zero
electronics
Step 3
Set LDX-4 and
Transducer Range
-5V
+5V
Zero
electronics
Step 4
Step 5
Add Offset
if Required
Final Checks
0V
Shift
zero
+5V
electronics
transducer
transducer
transducer
Null
Null
Null
+10V
For a bi-polar output i.e. ±10 VDC or ±20 mA, follow steps 1 to 3.
For a uni-polar output i.e. 0-10 V, 0-20 mA or 4-20 mA, follow steps 1 to 4.
In either case, step 5 (final checks) should be followed on the completion of the set-up.
LDX-4
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5.0: Setting up the Transducer and LDX-4 (continued)
5.2: Basic Procedure
STEP 1 - Set-up LDX-4 Links
If the transducer characteristics are known, set the frequency and input resistance links as required. If the transducer
characteristics are not known, the standard link settings should be used.
If your transducer is known to be outside of the standard sensitivity range, the X2 or DIV2 links will have to be used.
See section 5.3.
STEP 2 - Align LDX-4 Null and Transducer Null
Null the LDX-4.
1. Put the Gain link on position (7) as shown. This allows any electronics offset in the
output stage to be removed.
2. Adjust the Fine Offset control to give as near to zero output as practical.
Null the transducer.
1. Replace the Gain link to the original position.
2. Adjust the position of the transducer to give as near to zero output as practical.
This is the centre of the mechanical range.
NULL
Any electrical offset in the LDX-4 is removed. The transducer position is adjusted so that transducer and LDX-4 nulls are
aligned.
FREQ
LO
(ON) 1 2 3 4 5 6 (7)
HI
(OFF)
If the transducer cannot be centered for practical reasons an offset will remain within the system. There may be
noticeable interaction between Gain and Offset adjustment. This does not prevent the OD4 being set-up, however
several iterations may be required when adjusting Gain and Offset. Please contact your supplier if guidance is required.
LDX-4
17
M-1128/0505
5.0: Setting up the Transducer and LDX-4 (continued)
5.2: Basic Procedure
STEP 3 - Setting Bi-Polar Full-scale Output
1. Move the transducer to the position where maximum LDX-4 output is required.
2. If the polarity of the output is wrong, move the Polarity (FR) links to the R position (see link diagram).
Normal Output Polarity
Reverse Output Polarity
10K
2K
-¦R¦
|F|
-DIV 2
X2
X4
10K
2K
-¦R¦
|F|
-DIV 2
X2
X4
3. Move the RANGE link between 1 and 6 until the LDX-4 output is near the required value.
4. Adjust the Fine Gain control to give the required output.
5. A bi-polar output has now been set, proceed to step 5. If a uni-polar output is required, proceed to step 4.
Example: ±10 VDC is required from a ±1 mm transducer. Set the transducer to +1 mm and set the output to 10 V.
If your transducer is known to be outside of the standard sensitivity range, the X2, X4 or DIV2 links will have to be used.
See section 5.3.
LDX-4
18
M-1128/0505
5.0: Setting up the Transducer and LDX-4 (continued)
5.2: Basic Procedure
STEP 4 - Setting Uni-polar Full-Scale Output (adding an offset)
1. Move the transducer to the null position. LDX-4 output will be 0 V or 0 mA.
2. Apply offset using the +VE, -VE, 5 V and 10 V links and then adjust the Fine Offset control to set the offset precisely.
3. Perform final checks, step 5.
Example: 0-10 V is required for a ±1 mm transducer. Set the transducer to give ±5 V over the full range and then, with
the transducer at null, add +5 V offset. Adjust the Fine Offset control to give 5 V. When the transducer is moved to the
+1 mm position, the output will be +10 V.
Example: 4-20 mA is required for a ±1 mm transducer. Set the transducer to give ±8 mA over the full range and then,
with the transducer at null, add +2.5 V (approx. 5 mA) offset. Adjust the Fine Offset control to give +12 mA. When the
transducer is moved to the +1 mm position, the output will be +20 mA.
STEP 5 - Final Checks
Ensure that the calibration is correct by moving the transducer across the required mechanical range, checking
calibration points. Fine adjustment can be made if required.
It may only be possible to set the output accurately at the two calibration points. This is due to non-linearity within the
transducer.
LDX-4
19
M-1128/0505
5.0: Setting up the Transducer and LDX-4 (continued)
5.3: Transducer Sensitivity and the X2, X4, DIV2 Link
The LDX-4 compensates for changes in primary signal amplitude by producing an internal error signal that is the ratio
between the primary and secondary signals. If the transducer output signal is too high or too low, errors may occur that
can degrade the performance of the LDX-4 / transducer combination. For these transducers, the X2, X4 or DIV2 input
gain link must be used.
Transducer Full Range Output
In general, transducer sensitivity is quoted as mV/V/mm
Where:
mV is the output of the transducer
V is the primary voltage
mm is the mechanical position of the transducer from null (usually mid mechanical range).
To get the transducer Full Range Output, multiply all three together.
Example:
GP911-1 sensitivity is 210 mV/V/mm
GP911-1 range is ±1 mm
LDX-4 primary voltage 3 V
Transducer Full Range Output = 210 x 3 x 1 = 630 mV (0.63 V)
Set the X2, X4, DIV2 link as shown in the table below.
Transducer Full Range Output
Input Gain Link Setting
400 mV FR to 2500 mV FR
Standard Range - Link Parked on X2
2500 mV FR to 5000 mV FR
High Transducer Output - Link ON DIV2
150 mV FR to 400 mV FR
Low Transducer Output - Link ON X2
55 mV FR to 150 mV FR
Very Low Transducer Output - Link ON X4
LDX-4
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M-1128/0505
6.0: Half-Bridge only Variant
This is a half-bridge optimised variant of the standard product. The excitation frequency is higher (see specification) and
the transducer input connector is wired to accept half-bridge transducers with standard connections.
6.1: Connecting the transducer
The 5-pin DIN plug is screwed into the case mounted socket. Transducers not fitted with a plug should be wired to the
plug supplied. LVDT transducers cannot be connected to this input.
Blue
Standard Half-Bridge Gauging Probe Plug Connections
Black
VA
CORE
Cable Screen
Half-Bridge
Blue
Case
VO
3
+
VB
4
2
5
1
Red
Yellow
Half-Bridge Electrical Connections
Red and Blue
Energising
Yellow
Signal
Red and Yellow
In Phase for Inward Displacement
Black
Transducer Body Ground
Red
Case
Yellow
Centre Tap
Plug view
into pins
Note 1: + indicates inward movement of the tip.
Note 2: The transducer body may be disconnected from the cable screen by
cutting the black wire inside the connector
6.2: Setting up the Half-Bridge Transducer
The setting up procedure is the same as LVDT transducers. See section 5. The sensitivity of half-bridge transducers is
generally lower than for LVDT types, the x2 and x4 gain position may have to be used.
LDX-4
21
M-1128/0505
7.0: Specifications
7.1: Electrical
Parameter
Value
Power Supply
Typical Voltage / Current
Voltage Range
Current Range
24 VDC at 55 mA
10 to 30 VDC
140 mA at 10 V to 50 mA at 30 V
Transducer Excitation
Energising Voltage
Energising Frequency
3 Vrms nominal
2.5 kHz (Lo) or 5 kHz (Hi) nominal
10 kHz (Lo) or 13 kHz (Hi)
Energising Current
Special
LDX-4
see note 1
link selectable
Half-Bridge version only
30 mA max.
Transducer Signal Input
Input Signal Range
Standard
Input Load Resistance
Options
Comments
400 to 2500 mV FR
DIV2 2500 to 500 mV FR
x2 150 to 400 mV FR
x4 55 to 150 mV FR
6 gain ranges (applies to LVDT only)
see note 2
2, 10, 10 kΩ
Forward and Reverse
LVDT Input
Half-Bridge Input
link selectable
link selectable
standard
special plug wiring or half-bridge version only
22
M-1128/0505
7.0: Specifications (continued)
7.1: Electrical
Parameter
Value
Comments
Signal
Output
Output
Output
up to ±10 VDC into 1 kΩ
<1 mVrms
up to ±20 mA into 150 Ω load
see notes 3 and 4
±5 VDC (approx 10 mA) fixed
±10 VDC (approx 20 mA) fixed
±2.8 VDC (approx 5.6 mA)
link selectable
link selectable
Variable (adds to fixed offsets)
Output
Voltage Range
Residual Noise
Current
Output Offset
Coarse
Fine
Temperature Coefficient Gain
Temperature Coefficient Offset
Warm-Up
Linearity
Bandwidth (-3dB)
Protection (see note 6)
Power Supply
Inputs and Outputs
Certification (see note 7)
Immunity
Emissions
LDX-4
see note 5
<0.01% FRO/°C
<0.01% FRO/°C
15 minutes recommended
<0.1% FRO
500 Hz typical
Reverse connection protected
Short circuit protected
Transient and ESD Protected
BS EN61000-6-2:2001
BS EN61000-6-3:2001
23
Immunity for Industrial Environments
Emission for Residential, commercial and
light-industrial environments
M-1128/0505
7.0: Specifications (continued)
7.2: Mechanical and Connections
Parameter
Value
Comments
Transducer
Power Supply
Output Signal
Enclosure - Size
Weight
Material of Case
5-pin circular DIN
Internal Terminal Block
Internal Terminal Block
120 x 65 x 40 mm
300 g (0.66 lbs) approx.
Die-Cast Zinc Alloy (painted)
Excluding connectors
7.3: Environmental
Parameter
Value
Operating Temperature Range
Storage Temperature Range
IP Rating
0 - 60°C
-20 - 85°C
IP40
LDX-4
Comments
24
M-1128/0505
7.0: Specifications (continued)
7.4: Notes
1. Primary voltage absolute value and drift is not specified. The LDX-4 uses ratiometric techniques to compensate for
primary voltage drift.
2. The way in which the LDX-4 functions means a special configuration must be used for transducers outside of the
standard range. This is selectable by links. The majority of Omega LVDT transducers are within the standard range.
See section 5.
3. LDX-4 can drive into a 1 kΩ load but this offers no advantage. 10-100 kΩ is recommended.
4. Output voltage range can be adjusted as required anywhere within this range by using a combination of gain and
offset, for example. ±10 VDC, ±5 VDC, 0-5 VDC, 0-10 VDC, 4-20 mA.
5. Current output may be used at the same time as voltage output. Calibration of voltage and current cannot be
individually adjusted.
6. Protection applies to the product when fully installed according to the user manual. During installation the top of the
enclosure has to be removed for access to user adjustments. At this time standard ESD handling precautions for
electronic equipment should be followed.
7. The LDX-4 complies with the toughest electrical emissions and immunity regulations. Compliance requires
installation according to the user manual. Compliance does not guarantee performance as the installation
environment may be outside of test specification limits. The flexibility of LDX-4 means it can be installed in a variety
of ways according to user requirements. Simple installations with short non-screened cables will meet the lesser
light-industrial immunity regulations. Heavy industrial installations, especially with longer cables, will need more
careful installation with screened cables.
LDX-4
25
M-1128/0505
WARRANTY/DISCLAIMER
RETURN REQUESTS/INQUIRIES
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.
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.
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
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set
forth herein are exclusive, and the total liability of OMEGA with respect to this order,
whether based on contract, warranty, negligence, indemnification, strict liability or
otherwise, shall not exceed the purchase price of the component upon which liability is
based. In no event shall OMEGA be liable for consequential, incidental or special
damages.
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.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© 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.
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 WARRANTY / DISCLAIMER language, and, additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever
arising out of the use of the Product(s) in such a manner.
LDX-4
M-1128/0505
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
Shop online at www.omega.com
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M-1128/0505