HL Series Displacement Sensors
HL Series high-temperature displacement sensors provide accurate noncontacting measurement of conductive surface motion in hostile environments. Thermal compensation techniques that maintain sensitivity and linearity with small zero shifts make these accurate high temperature measurements possible.
ZSY’s sensors feature laser-welded Inconel construction, making them perfect for a variety of extreme environment applications.
The sensors use the versatile ZED82 family of signal conditioning electronics. Single channel systems are available in the NEMA-enclosed ZED82 or bench-top/ rack-mountable ZED82. The NEMA enclosure houses an internal power supply, digital panel meter and window kit. Up to eight measuring channels are available in the rack-mountable ZED82. (See ZED82 data sheet for a complete description and additional specifications for these electronics.)
MAIN FEATURES
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Sensor Cables
Sensor cable extension
Most sensors can handle longer cable lengths, although increasing the cable length can and will affect some performance specifications. Shorter than standard cable lengths are also available. Call an apps engineer to discuss your particular requirements.
When passing the cable through a pressure barrier, a weld sleeve can be added at a location specified by the customer. The weld sleeve allows for welding the cable in place without welding directly to the hardline cable sheath. This sleeve can also be used with compression fittings to prevent crushing the thinner hardline cable sheath.
Standard published ranges are based on meeting a set of performance specs. Custom calibrations are possible to meet specific application needs. Contact a ZSY applications engineer if a custom calibration is desired.
Target material
Unless otherwise specified, nonferrous systems will be calibrated with an aluminum target, ferrous systems will be calibrated with a 4130 steel target. If your target material is significantly different in conductivity and/or permeability it may be best to calibrate using the same material as your target.
Temperature compensation
Extreme Environment sensors are temperature compensated as standard.They are provided with output data at ambient and two additional temperatures specified by the customer. Linearity optimization is done at one of these three temperatures, as specified by the customer.
Output voltage range can be different from the published specifications.Contact an applications engineer if you desire a custom output.
The electronics comes in a Eurocard format. Enclosure options include a full 19-inch rack, a 3/4 benchtop rack, and a 1/2 benchtop rack.
NEMA
In harsh locations, up to two channels can be housed in a NEMA enclosure.
Power supplies
P-3400
SERIES For economy and reliability in a modular power supply, P-3400 Series is unsurpassed. The regulated ±15 Vdc output is compatible with all eddy cuurent measuring systems requiring an external power source, or for any other use requiring a ±15 Vdc output.
The P-3410 features 100mA output with one terminal block, and will power one measuring channel. The P-3450 features 500 mA output with three terminal blocks, and will power up to six measuring channels.
P-3600
SERIES Compatible with the ZED23 and ZED24, these switching power supplies offer clean, reliable, DC voltage output in a small, DIN-rail-mount package.
Calibration fixtures
Calibration of a displacement measuring system verifies that the system output relates to a known physical displacement. Calibration of a ZSY eddy current measuring system requires the ability to position a target at specific locations relative to the range of the sensor.
All ZSY balanced bridge-type measuring systems are calibrated prior to shipment, and ready to use out of the box. Certain requirements can necessitate the need to recalibrate the system:
> Sensor replacement due to physical damage.
> New calibrated range requirements.
> Sensor/bridge change to different model.
> Calibration check/recalibration program.
Proper sizing of a calibration fixture is based on sensor diameter. The calibration fixture has a recommended maximum sensor size for use, based on the physical size of the fixture that sets the radial distance from the sensor to the fixture itself. When a sensor larger than the recommended maximum is calibrated using the fixture, the performance of the system can be affected.
This fixture can be used with virtually any inductive type sensor manufactured in a cylindrical housing, and is provided with a rotating-shaft micrometer head with an aluminum anvil/target. If a different target material is desired, a suitably-sized piece of the target material is attached to the existing anvil.
For larger diameter sensors, ZSY offers hard impact precision ceramic calibration spacers. The set includes seven spacers, 1.5 inches in diameter in the following thicknesses: 0.050 inch, 0.100 inch, 0.200 inch, 0.300 inch, 0.400 inch, 0.500 inch and 1.00 inch. Each spacer may be purchased separately, and a 0.025 inch spacer is also available.
CALIBRATION ACCESSORIES
Micrometer calibration fixture (sensors up to 3U in size), digital micrometer with inch/mm display, 0-1" travel, 0.0001" display resolution. Part number 855578-001.
Individual ceramic calibration spacers
0.025 inch (0.64 mm) Part number 811149-A025
0.05 inch (1.27 mm) Part number 811149-A050
0.10 inch (2.54 mm) Part number 811149-A100
0.20 inch (5.08 mm) Part number 811149-A200
0.30 inch (7.62 mm) Part number 811149-A300
0.40 inch (10.16 mm) Part number 811149-A400
0.50 inch (12.7 mm) Part number 811149-A500
1.00 inch (25.4 mm) Part number 811149-B000
Set of seven spacers (0.05 through 1.00 inch)
Part number 850859-001
Typical Applications
Nuclear reactors
Steam and gas turbines
Turbine and rocket engines
Chemical processes
Research projects
High temperature processing
| Parameter | Value |
| Operating temperature range | -320°F to 1000°F (+1200°F short term) |
| Operating pressure range | Up to 5000 psi |
| Power input | (120 Vac) |
| Output (electrical zero offset up to 50% of measuring range) | From 0 to 2 Vdc nominal (50 mV/mil) |
| Resolution (at mid range) | |
| Static | 30 to 100 µinch (0.00003 to 0.0001 inch) [0.00076 to 0.0025 mm] |
| Repeatability | 30 to 100 µinch at mid range |
| Nonlinearity | Within ±1% FSO at customer selected calibration temp. |
| Typical temperature coefficients (over maximum specified thermal range) | |
| Zero shift | 0.02 to 0.03%/°F FSO (0.054%/°C FSO) |
| Sensitivity shift | 0.02 to 0.03%/°F FSO (0.054%/°C FSO) |
| Frequency response | 0-10 kHz (3 dB) - Higher available on request |
| Sensor material | Corrosion resistant high temperature nickel chrome alloy (Inconel 718) welded and hermetically sealed |
| Cable material | Nickel chrome alloy (Inconel 600) sheathed, mineral insulated |
| Standard cable lengths | |
| Hardline | 10 feet |
| Softline | 5 feet |
| Target material | Conductors – nonmagnetic magnetic |
| SPECIFICATIONS FOR A NONFERROUS TARGET | ||||
| SENSOR | RANGE inch/mm | OFFSET MAX inch/mm | STATIC RESOLUTION inch/mm | DYNAMIC RESOLUTION inch/mm |
| HL25 | 0.050/1.27 | 0.001/0.025 | 3x10-5/7.6x10-4 | 5x10-5/1.3x10-3 |
| HL50 | 0.150/3.81 | 0.005/0.127 | 5x10-5/1.3x10-3 | 1x10-4/2.5x10-3 |
| HL75 | 0.200/5.00 | 0.010/0.254 | 1x10-4/2.5x10-3 | 1x10-4/2.5x10-3 |
| SPECIFICATIONS FOR A FERROUS TARGET | ||||
| SENSOR | RANGE inch/mm | OFFSET MAX inch/mm | STATIC RESOLUTION inch/mm | DYNAMIC RESOLUTION inch/mm |
| HL25 | 0.035/0.90 | 0.001/0.025 | 3x10-5/7.6x10-4 | 5x10-5/1.3x10-3 |
| HL50 | 0.100/2.54 | 0.005/0.127 | 5x10-5/1.3x10-3 | 1x10-4/2.5x10-3 |
| HL75 | 0.100/2.54 | 0.010/0.254 | 1x10-4/2.5x10-3 | 1x10-4/2.5x10-3 |
Each sensor has dual coils inside the corrosionresistant case. In operation, an electromagnetic field generated by the active coil penetrates the front of the sensor to induce eddy currents in a conductive target within the sensor’s range. Changes in target displacement result in impedance variation in the active coil. This variation is detected by the signal conditioning electronics and converted to a linear analog output signal.
The symmetrical design of the dual coils compensates for constant and slowly changing temperatures from -320°F to +77°F or from 77°F to +1000°F. Measurement quality is unaffected by most corrosive gasses and liquids and most other environmental contaminants such as oil, dirt, radiation, and stray RF and magnetic fields.
The cabling has two sections joined by a LEMO® transition connector: a high-temperature metalsheathed,mineralinsulated section designed to the same environmental specifications as the sensor, and a flexible section of Teflon® jacketed, twisted pair, coax cable for connection to the electronics unit.
Typical Applications
Nuclear reactors
Steam and gas turbines
Turbine and rocket engines
Chemical processes
Research projects
High temperature processing
Typical Applications
Nuclear reactors
Steam and gas turbines
Turbine and rocket engines
Chemical processes
Research projects
High temperature processing
HL25 Sensor
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HL50 Sensor
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HL75 Sensor
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Mounting Considerations
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ZED23 Series Single-channel multi-purpose non-contact displacement sensing system
ZED24 Non-contact high-precision proximity measuring system
ZED97 Flexible, high-resolution position/displacement systems for OEM applications
