Solartron Metrology Ametek OD2 Manual

OD2 USER LEAFLET

2Part No. 501107 Issue 13
SAFETY SUMMARY
S1. Safety Characteristics
This apparatus has been tested and supplied in a safe condition. This manual contains some
information and warnings which must be followed by the user to ensure safe operation and to
retain the apparatus in a safe condition.
S1.1 Terms in This Manual
CAUTION statements identify conditions or practices that could result in damage to the equipment
or other property.
S1.2 Symbols in This Manual
This symbol indicates where applicable cautionary or other information is to be found.
S2. Safety Instructions
Upon delivery from the factory the instrument complies with the required safety regulations, see
para. S1. To maintain this condition and to ensure safe operation, the instructions below must be
carefully followed.
S2.1 Power Source
This product is intended to operate from a power source that will not apply more than 48 volts DC
between the supply conductors.
S2.2 Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an explosive atmosphere unless it has been
specically certied for such operation.
S2.3 Grounding the Product
This product is grounded through the grounding conductor of the power supply.
S2.4 Do Not Remove Covers or Panels
To avoid personal injury, do not remove the lid. Do not operate the product without the lid properly
tted.
CAUTION: Electrical Safety
Under normal circumstances, you are unlikely to suffer any real harm from the low voltages and
currents used in the OD2 Transmitter. However, the electrical connections should be made with
the power off.
SERVICE SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators’ Safety Summary
This product contains no user serviceable parts
Adjustments may be made to the internal gain settings by qualied personnel, Chapter 5 refers.

3
Part No. 501107 Issue 13
Section Title Page
Safety Summary .................................................................................... 2
Service Safety Summary ....................................................................... 2
List of Contents ...................................................................................... 3
List of Drawings ..................................................................................... 4
List of Tables .......................................................................................... 4
1. GENERAL
1.1 Introduction ..................................................................................... 5
1.2 Specification.................................................................................... 5
1.3 Safety Considerations..................................................................... 5
1.4 Instruments Covered by Manual ..................................................... 5
1.5 Maintenance and Repair ................................................................ 5
1.6 Dismantling the Instrument ............................................................ 5
2. INSTALLATION
2.1 Introduction .................................................................................... 6
2.2 Initial Inspection ............................................................................. 6
2.3 Preparation for Use ........................................................................ 6
2.4 Power Requirements ..................................................................... 6
2.5 Working Environment ..................................................................... 6
2.6 Physical Description ....................................................................... 6
2.7 Mounting ........................................................................................ 7
3. OPTIONS
3.1 Introduction .................................................................................... 8
3.2 4-20mA or 0-20mA Operation ........................................................ 8
3.3 4-20mA Operation .......................................................................... 8
3.4 0-20mA Operation .......................................................................... 8
3.5 Frequency Selection ...................................................................... 9
3.6 Tuning Capacitor Selection ............................................................ 9
3.7 Gain Selection ................................................................................ 10
4. ELECTRICAL CONNECTIONS
4.1 Terminal Designation ..................................................................... 11
4.2 Transducer Connections ................................................................ 11
4.3 Non-Standard Connections ............................................................ 12
4.4 Connecting Instrumentation ........................................................... 12
5. SETTING UP
5.1 Gain Selection ................................................................................ 14
5.2 Zero Adjustment ............................................................................. 14
5.3 Other Switch Settings .................................................................... 14

4Part No. 501107 Issue 13
Section Title Page
6. CALIBRATION
6.1 Calibration with Standard Solartron Transducers ........................... 15
6.1.1 As 4-20mA Transmitter ................................................................ 15
6.1.2 As 0-20mA Transmitter ................................................................ 15
APPENDIX A - Generation Transducer Connections (LVDT) ..................... 16
APPENDIX B - Specification ...................................................................... 17
LIST OF DRAWINGS
1.1 Instrument Identification................................................................ 5
2.1 Mounting Holes ............................................................................ 7
3.1 4-20mA Option ............................................................................. 8
3.2 0-20mA Option ............................................................................. 8
3.3 Gain Selection Switch .................................................................. 10
4.1 Connector 1 ................................................................................. 11
4.2 Connection 2 ................................................................................ 12
4.3 4-20mA Transmitter Connections ................................................. 13
4.4 0-20mA Transmitter Connections ................................................. 13
LIST OF TABLES
3.1 Frequency Selection .................................................................... 9
3.2 Switch Settings ............................................................................ 9
3.3 Gain Selection Switch 8 ................................................................ 10
4.1 Connector 1 ................................................................................. 11
4.2 LVDT Connections ....................................................................... 11
5.1 Gain Selection............................................................................... 14
B1.1 Common Specifications ............................................................... 17
B1.2 Instruments Referred to by this Manual ....................................... 17
Return Of Goods
Solartron Sales Ofces

5
Part No. 501107 Issue 13
1. GENERAL
1.1 INTRODUCTION
The Model OD2 Transmitter is designed for use with ac inductive type LVDT displacement trans-
ducers. It has a dual function: (1) its onboard oscillator derives power from the supply and pro-
duces a sine wave carrier to drive the transducer primary winding; (2) its amplier, demodulator
and lter circuit conditions the transducer output and a voltage-to-current converter produces
this as a dc milliamp drive. The transmitter is especially suitable where a readout is required at a
substantial distance from the transducer and for interfacing with a controller, or computer in auto-
mated manufacturing processes.
1.2 SPECIFICATIONS
Instrument specications are listed in Table B1.1. These specications are the performance stan-
dards or limits against which the instrument is tested.
1.3 SAFETY CONSIDERATIONS
Before operation, the instrument and manual, including the safety page, should be reviewed for
safety markings and instructions. These must then be followed to ensure safe operation and to
maintain the instrument in a safe condition.
1.4 INSTRUMENTS COVERED BY MANUAL
Attached to the top of this instrument is a name plate (Fig. 1.1 ), this manual only refers to instru-
ments listed in Table B1.2.
1.5 MAINTENANCE AND REPAIR
If the instrument is suspected of being unsafe, take it out of operation permanently. This is the
case when the instrument:
- shows physical damage;
- does not function anymore;
- is stressed beyond the tolerable limits (eg. during storage and transportation).
1.6 DISMANTLING THE INSTRUMENT
Before opening the instrument, disconnect it from all power sources. Refer to the Service Safety
Summary. Calibration, maintenance or repair must be performed only by trained personnel being
aware of the risks.
Fig. 1.1 - Instrument Identication

6Part No. 501107 Issue 13
2. INSTALLATION
2.1 INTRODUCTION
This section provides installation instructions for the instrument. It also includes information about
initial inspection and damage claims, preparation for use and packaging, storage and shipment.
2.2 INITIAL INSPECTION
Inspect the shipping container for damage. If the container or cushioning material is damaged,
it should be kept until the contents of the shipment have been checked for completeness and
the instrument has been checked mechanically and electrically. If the contents are incomplete,
or if there is a mechanical damage or defect, or if the instrument does not pass the operator’s
checks, notify the nearest Solartron Metrology office. Keep the shipping materials for carrier’s
inspection.
2.3 PREPARATION FOR USE
CAUTION:
Do not perform electrical tests when there are signs of shipping damage to any portion of the
outer enclosure.
It is recommended that all installation instructions are read fully prior to installation of the
instrument.
2.4 POWER REQUIREMENTS
A dc power supply of 13V to 48V and up to 30mA is required. Because the transmitter is
frequently installed at a considerable distance from the indicator/control point, there is a
possibility that the supply cable connections will be reversed. The transmitter is protected by an
internal diode against possible damage caused by reversed polarity.
For correct operation 13V must be achieved at the transmitter at 20mA full scale, the total
resistance of the installed indicator and cable must not be too large. As a general guide do not
exceed the value of R calculated using the following formula:
Where Vs = actual power supply voltage
For example, if Vs = 24V, R O 550 ohms.
2.5 WORKING ENVIRONMENT
Model OD2 Transmitters will operate in environmental temperatures from 0 to 60oC (32 to
140oF).
Provided the lid and cable entry seals have been properly applied, the enclosure will withstand
low pressure water hosing to IP65 specification requirements. This version is therefore ideally
suited for installation in dirty or damp industrial environments or in the open where it may be
exposed to rain.
2.6 PHYSICAL DESCRIPTION
The OD2 Transmitter can be supplied enclosed in a grey ABS plastic box measuring 120mm x
80mm x 55mm (4.75in x 3.15in x 2.16in) deep with sealed cover and cable entries, one for the
transducer wire and the other for the supply cable.
Alternatively, it is available simply as a basic printed circuit card measuring 94mm x 72mm (2.7in
x 2.83in) for mounting into the customer’s own enclosure. Cable glands accept wires from 1mm
to 5mm (0.04in to 0.02in) diameter.
Vs
- 13
0.02
ohms
R≤

7
Part No. 501107 Issue 13
2.7 MOUNTING
The instrument has four (4) 4.2mm (0.165in) diameter mounting holes on 108mm x 50mm (4.25in
x 1.97in) centres. These mounting holes are segregated from the electronics by partitioning in the
box moulding which may thus be secured to any surface using only two screws without affecting
the sealing.
Fig. 2.1 - Mounting Holes Fig. 2.1 - Mounting Holes
2.8 ELECTRICAL AND EMC CONSIDERATIONS
The OD2 meets the following requirements
Emissions
EN61000-6-3, specically EN 55022 Conducted Emissions Class B and EN55022 Radiated Emis-
sions Class B.
Susceptibility
EN610004-3 Radiated Immunity 1.4GHz to 2.7GHz 3V/m
EN610004-3 Radiated Immunity 80MHz to 1GHz 10V/m
ESD
EN610004-4-: ±4kV contact and ±8kV air
Installation Guidance
The type of cabling used to connect the OD2 depends on the electrical environment. In a clean
environment unscreened twisted pairs provide a low cost suitable connection, in an environment
where electrical noise is higher, such as installation inside a machine or on the factory oor it is
advised to use screened cables.
Do not route power cables close to the OD2 or any interconnecting cables as these may cause a
disturbance in the performance. Avoid as much as possible mounting the OD2 close to any kind of
switch gear or other equipments that can produce high intensity electrical or magnetic elds.
Wherever possible keep cables below 3m in length.
50mm
108mm
Fig. 2.1 Mounting Holes
Note: Two securing screws and two nuts
for alternative xing to a DIN46277-1 rail are
supplied loose with the transmitter.

8Part No. 501107 Issue 13
3. OPTIONS
3.1 INTRODUCTION
OD2 Transmitter will operate with most Solartron transducers having strokes up to E100mm
(E4in), in particular with the SM, AC, AX, AT and some of the MACH 1’s. Switches on the printed
circuit card are used to set up the transmitter for a specific transducer type and onboard Span/
Zero controls are provided for calibration purposes.
3.2 4-20mA OR 0-20mA OPERATION
The OD2 will operate equally well as either a 4-20mA two wire transmitter or a 0-20mA three wire
transmitter.
3.3 4-20mA OPERATION
As a 4-20mA transmitter, only two wires are used to connect to the power supply and indicator:
Fig. 3.1 - 4-20mA Option
The transmitter draws 4mA to operate the electronics and the position of the transducer controls
a 0-16mA current sink wired in parallel. Therefore the position of the transducer is indicated by
the current consumption and a broken cable by zero current. Due to its inherent fault indication,
the need for only two wires and its low susceptibility to electrical noise/cable resistance, it is ideal
for industrial environments.
3.4 0-20mA OPERATION
The 0-20mA transmitter works on the same principle, but has three wires.
Fig. 3.2 - 0-20mA Option
This has the extra complication of the third wire, but a simpler indicator can be used.
Current
Driven
Indicator
Supply
Conditioner
Transducer
Indicator
Supply
Conditioner
Transducer

9
Part No. 501107 Issue 13
3.5 FREQUENCY SELECTION
Switch S1, S2, S3 and S4 select the excitation frequency with reference to Table 3.2. The opti-
mum frequency for the transducer in use should be selected (see Table 3.1).
Table 3.1 - Frequency Selection
3.6 TUNING CAPACITOR SETTING
Switch S5, S6 and S7 introduce tuning capacitors in parallel with the transducer primary coil with
reference to Table 3.3 set S5 to S7 to the optimum capacitance for the transducer in use.
Transducer SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
SM/1 On On Off Off On On Off On
SM/3 On On Off Off Off On Off Off
AC/15 & 100 Off Off On On Off Off On Off
AC/25 & 50 Off Off On On Off On Off Off
AC/250 Off Off On On Off Off On On
AX1 to 5 Off Off On On On On On Off
MACH 1 Series (5kHz)
BS/1.5 & BS/15 Off Off On On On On On Off
BS/2.5 & BS/7.5 Off Off On On On On Off Off
BS/5 & BS/10 Off Off On On Off Off On Off
BS/25 Off Off On On On On On Off
Table 3.2 - Switch Settings
Note: Refer to BS settings for BT transducers
Frequency Selection
Switch 1, 2, 3 and 4
13kHz
5kHz
Off On
S1
S2
S3
S4
S1
S2
S3
S4
S5
Off On

10 Part No. 501107 Issue 13
Fig. 3.3 - Gain Selection Switch 8
3.7 GAIN SELECTION
Switch 8 allows selection of Hi and Lo gain. In the Hi position (normal for gauging transducer)
the span pot RV2 will allow a gain adjustment of 5 and has an input range of 0 to 320mV for a
4-20mA output. In the Lo position (normal for displacement transducers) the span pot RV2 will
allow a gain adjustment of 5 and an input range of 0 to 150mV for a 4-20mA output (ref. Table
5.1).
Table 3.3 - Gain Selection Switch 8
5
6
7
4
3
2
1
Span
Zero
Gain Switch
On
RV1
RV2
2
3
4
5
6
7
8
1
Gain Selection
Switch 8
Lo
Hi
7
8
7
8

11
Part No. 501107 Issue 13
4. ELECTRICAL CONNECTIONS
4.1 TERMINAL DESIGNATION
Connections should be made to the appropriate terminals detailed in Table 4.1 and 4.2. Refer to
Section 2 prior to making any connections.
Transducer Connections
Terminal Number Designation
1 Excitation (+)
2 Excitation (-)
3 Input (+)
4 Input (-)
Table 4.1 - Connector 1
Fig. 4.1 - Connector 1
4.2 TRANSDUCER CONNECTIONS
LVDT Connections - The following connections for standard Solartron transducers should be
made:
AX/AC/SM/AE Series
and MACH 1 (5kHz)
Pin Number Function
Red 1 Excitation (+)
Blue 2 Excitation (-)
White 3 Demodulator Input (+)
Green 4 Demodulator Input (-)
Yellow to White or Green via resistor provided
Table 4.2 - LVDT Connections
4
3
2
1
Con 1

12 Part No. 501107 Issue 13
4.3 NON-STANDARD CONNECTIONS
For non-standard transducer connections please contact your nearest Solartron Metrology office.
Note: To reverse the transducer output, ie. change for + for inward movement from null to - for
inwards movement from null, reverse connections for the green and white wires (AX/AC series)
or the black and red wires (MACH 1 series).
4.4 CONNECTING INSTRUMENTATION
Connections should be made with no power applied to the OD2. Once connections have been
made pass the wire through the grommet in the case. If required provide some cable retention to
prevent unwanted disconnection from the terminal block. Do not operate the OD2 unit without the
top cover securely fastened.
Fig. 4.2 - Connector 2
5
6
7
1
8
Con 2

13
Part No. 501107 Issue 13
A 4-20mA Transmitter is suited to current-driven indicators and provides a directly compatible
interface with computerised data acquisition and control systems. The Transmitter (Figure 4.3)
draws 4mA to operate the electronics while the position of the transducer controls a 0-16mA
current sink wired in parallel. Thus, the position of the transducer is indicated by the current con-
sumption and a broken cable is identied by zero current. This inherent ability for fault indication,
together with its low susceptibility to electrical noise and cable resistance, and the need for only
two wires make the 4-20mA Transmitter ideal for use in industrial environments.
Fig. 4.3 - 4-20mA Transmitter Connections
A 0-20mA Transmitter (Figure 4.4) works on the same principle, but without linking the two current
drives. It can therefore be used with a simpler indicator although it needs a third wire.
Fig. 4.4 - 0-20mA Transmitter Connections
Supply
Transducer
Current Driven
Indicator
Vs
Resistance = R
Two Wire Transmitter
OD2 Transmitter
7
6
4
mA
5
0-16
mA
Supply
Transducer
Current Driven
Indicator
Vs
Three Wire Transmitter
OD2 Transmitter
Resistance = R
0-20
mA
7
6
4
mA
5

14 Part No. 501107 Issue 13
5. SETTING UP
5.1 GAIN SELECTION
The coarse gain should be selected using Table 5.1 RV2 (span) may then be used for fine
adjustment.
Transducer
Range Useable (mm)
4-20mA 0-20mA
Low Gain High Gain Low Gain High Gain
SM/1 0.7 to 3.6 0.2 to 1.0 0.9 to 4.5 0.3 to 1.3
SM/3 0.8 to 4.1 0.2 to 1.1 1.0 to 5.1 0.3 to 1.5
AC/15 3.1 to 15.6 0.9 to 4.4 3.9 to 19.5 1.1 to 5.5
AC/25 5.3 to 26.5 1.5 to 7.5 6.7 to 33.2 1.9 to 9.4
AC/50 11.4 to 57.0 3.2 to 16.1 14.3 to 71.3 4.1 to 20.2
AC/100 21.2 to 106.0 6.0 to 30.0 26.6 to 132.6 7.6 to 37.6
AC/250 14.2 to 71.4 50.5 to 252.4 18.0 to 90.0 63.0 to 316.0
AX/1 0.5 to 2.5 0.14 to 0.7 0.6 to 3.2 0.2 to 0.9
AX/1.5 & AX/2.5 0.7 to 3.5 0.2 to 1.0 0.9 to 4.4 0.3 to 1.3
AX/5 1.0 to 5.0 0.3 to 1.4 1.3 to 6.3 0.4 to 1.8
MACH 1 Series
(5kHz only)
BS/1.5 0.4 to 2.0 0.1 to 0.6 0.5 to 2.5 0.1 to 0.7
B S/2.5 0.5 to 2.5 0.1 to 0.7 0.6 to 3.2 0.2 to 0.9
BS/5 1.0 to 5.2 0.3 to 1.5 1.3 to 6.5 0.4 to 1.8
BS/7.5 2.1 to 10.4 0.6 to 2.9 2.6 to 13.0 0.7 to 3.7
BS/10 3.9 to 19.3 1.1 to 5.5 4.8 to 24.1 1.4 to 6.8
BS/15 3.7 to 18.6 1.1 to .3 4.7 to 23.3 1.3 to 6.6
BS/25 6.8 to 34.0 1.9 to 9.6 8.5 to 42.5 2.4 to 12.0
Table 5.1 - Gain Selection
Note: The upper gain limit will be set by the transducer. For example, although the 4-20mA
electronics with low gain will allow an AX transducer to be used over the stroke range E2.5mm
(0.31in), it is only a 1mm (0.24in) transducer, so E1mm (E0.24in) is the practical limit.
5.2 ZERO ADJUSTMENT
The Zero (RV1) control allows the zero voltage output position to be adjusted within the normal
stroke of the transducer. Sufficient zero adjustment is provided so that the minimum stroke range
can be used anywhere within the maximum range. For example, with the SM3 transducer and
the 4-20mA transmitter operating with switch 8 OFF (low gain), the Span range is approximately
for E0.8mm (E0.03in) up to E4.1mm (E0.17in) (E3mm in practice). Adjustment of the Zero
control can place the E0.8mm (E0.03in) anywhere in the length of the transducer from -3.0 to
-1.4mm (-0.12 to -0.057in) and from +1.4 to +3.0mm (+0.057 to +0.12in). Less Zero adjustment
is available with a wider span, but does not apply in this case since it would involve moving
outside the transducer’s range.
5.3 OTHER SWITCH SETTINGS
Referring to Chapter 3, Table 3.2, set the other switch settings S1 to S7 to a suitable position.

15
Part No. 501107 Issue 13
6. CALIBRATION
6.1 CALIBRATION WITH STANDARD SOLARTRON TRANSDUCERS
6.1.1 4-20mA Transmitter
Move the transducer to the 4mA end of its required travel and adjust the Zero control to give 4mA.
If 4mA cannot be obtained, rotate the Span control clockwise until it can.
Move the transducer to the 20mA end of its required travel and adjust the Span control to give
20mA. If the output stays at 4mA or falls, again the transducer white and green connections are
probably reversed. It will prove necessary to adjust the Zero and Span controls more than once to
achieve a satisfactory stroke range.
6.1.2 0-20mA Transmitter
Move the transducer to the 0mA end of its required travel and adjust the Zero control to give 0mA
on an indicator. The control should be set for just 0mA since the current cannot go negative and a
wide range of Zero control may produce 0mA. It may be necessary to slightly adjust the Span con-
trol clockwise, in association with Zero control, in order to achieve 0mA if the transducer is being
operated over a small range at one end of its travel.
Move the transducer to the 20mA end of its required travel and adjust the Span control to give
20mA. If the current stays at 0mA, try reversing the white and green transducer connections. It
may prove necessary to adjust the Zero and Span controls more than once to achieve a satisfac-
tory stroke range.

16 Part No. 501107 Issue 13
APPENDIX A
GENERAL TRANSDUCER CONNECTIONS: AX, AC, MD, SA, SM Series, & MACH 1
Connections to connector 2 should be made as indicated:
Yellow wire on LVDT’s:
a) Normally left unconnected and insulated.
b) On some transducers a resistor must be connected from yellow to green or white as
instructed on transducer calibration sheet.
c) Do not extend beyond standard cable length fitted to transducer.
Where screen is used, connect to case of plug. Ensure that elsewhere the screen is isolated
electrically.
Cable colours are as fitted to Solartron transducers.
Increase of element impedance marked P gives a positive going voltage output.
Note: The black lead should only be connected if the transducer case is to be grounded.
P
LVDT
Blue
Pin
Red
Screen
2 Energising
1 Voltage
White
Green
4
To Conditioner
3
Black
Ground (4)

17
Part No. 501107 Issue 13
APPENDIX B
Common Specications
Power Supply Oscillator/Demodulator
Power Supply 13 - 42V dc Oscillator frequency 5kHz or 13kHz switchable
Oscillator output voltage 0.9V rms
Oscillator max. current 16mA
Loading Up to 30mA Input sensitivity for rated
output
30 to 530mV/V
in 2 coarse gain positions
Supply Protection Protected internally
against reversed
connections
Range of gain control 3.5:1 switched
5:1 adjustable
Output
Mechanical Non-Linearity Better than 0.02%
Output zero Offset Up to 100% on maximum
gain
Case Size 120mm x 80mm x
54.5mm
Output protection Output open/short circuit
protected
Weight 400g Output ripple @ 5kHz 0.1% rms maximum
Mounting Four (4) Fixing Holes Output lter 25Hz cut off, critically
damped
Termination Connector Screw
Terminals
Effect of Supply Change Negligible
Cable Gland Accept wire 1 to 5mm
dia.
Effect of Temperature
Change
Zero 0.01% per oC
typical
0-60oC Span 0.01% per oC
typical
Case Material Light grey ABS plastic Zero 0.02% per year
typical
Span 0.03% per year
typical
Environment Sealed to IP65 Oscillator protection Open and short circuit
protected
Table B1.1
Instruments Referred to by this Manual
Part Number Description
910764 OD2 Displacement Transmitter
Table B1.2