Displacement Measuring System Model ZED24 is a non-contact, analog proximity measuring system. The system operates on a traditional Colpitts oscillator circuit. This low-cost, easy-to-use system can be utilized for precision static and dynamic measurements of conductive targets.The ZED24 system consists of two subassemblies: sensor with integrated cable, and signal conditioning electronics module. Two standard sensor configurations are available, the 24C and the 24CM.
The ZED24 electronics is housed in a DIN rail mount enclousre with terminal connections for +12 Vdc to +24 Vdc input power and the variable voltage and switched ouptuts. offers either the P-3410 or P-3450 power supplies. The system comes standard with
one of two production sensor configurations — the
24C or the 24CM. Both of these sensors are rated for
continuous operation up to 400°F (205°C).
Selected performance data and dimensions for these two sensors are shown in the data sheet. Additional sensor configurations are available upon request.
MAIN FEATURES
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Sensor Cables
In-line cable connector splice
Many sensors come with integral sensor cables. Routing this cable in some applications is difficult and something you only want to do once. Including an in-line connector splice in the cable, near the sensor itself, allows for easy sensor replacement should the need arise.
Hermetic in-line connector splice
Some applications pass the sensor through a pressure boundary, most commonly a vacuum chamber wall. We offer an in-line hermetic bulkhead splice for these applications.
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
The ZED24 may be used in a variety of applications using target materials such as ferrous or stainless steel or aluminum. Applications include displacement, vibration, sorting and event capture. With its good sensitivity to small targets, and high speed switching, it is ideal for RPM sending in harsh environments. The opto-isolated switched output makes the ZED24 ideal for interfacing to PLC inputs, counters,timers or alarm circuits.
| Parameter | Value |
| Resolution | <0.008% of measuring range using a 24CM sensor on a 4130 steel target at mid scale, mid gain, and 12 Vdc input. |
| Input voltage | Regulated 12 Vdc to 24 Vdc. Fuse limit input current from power source to 11 mA, 0.28 W maximum at full load. |
| Analog output | Voltage 0-22 Vdc with 24 Vdc input 0-10 Vdc with 12 Vdc input Current (full load) 4.2 mA maximum Impedance 50 ohms Frequency response 0-10 KHz (± 3db) |
| Switched output | Load current 100 mA maximum AC or DC Load voltage 30 V r.m.s., 42.4 V peak, or 60 Vdc On resistance 30 ohms minimum / 50 ohms maximum Switch point hysteresis 0.56% of full scale for 9C sensor, and 0.97% of full scale for 5Csensor using 24 Vdc input on 4130 steel Frequency response 3.3 KHz |
| Operating temperature range | Electronics +32°F to +150°F (0°C to +66°C) |
| Storage temperature range | Electronics -58°F to +212°F (-50°C to +100°C) |
| Thermal drift | Less than 0.22% per °C of full scale for sensor, electronics or system |
| IP rating | Sensor – IP67 Electronics – IP40 |
| SENSOR | TARGET MATERIAL | STATIC RESOLUTION | |
| inch | mm | ||
| 24C | Non-ferrous (aluminum) | 0-0.175 | 0-4.45 |
| 24C | Non-magnetic (304 stainless) | 0.025-0.200 | 0.64-5.08 |
| 24C | Magnetic steels (4130) | 0.040-0.275 | 1.02-6.99 |
| 24CM | Non-ferrous (aluminum) | 0-0.100 | 0-2.54 |
| 24CM | Non-magnetic (304 stainless) | 0.010-0.125 | 0.254-3.18 |
| 24CM | Magnetic steels (4130) | 0.015-0.150 | 0.38-3.81 |
The ZED24] system operates on a traditional Colpitts oscillator circuit where the sensor acts as the resonating coil for the oscillator. The proximity of the target to the sensor face pulls the oscillator, changing its frequency and amplitude of modulation, and controlling a variable gain oscillator section within the electronic circuit.
The signal is half-wave rectified and filtered to obtain an analog voltage proportional to the target position or displacement. The analog voltage output can be varied by adjustment of the gain. The input power is diode protected and regulated to provide a clean low-noise signal. The output is short-circuit current protected.
The ZED24 may be used in a variety of applications using target materials such as ferrous or stainless steel or aluminum. Applications include displacement, vibration, sorting and event capture. With its good sensitivity to small targets, and high speed switching, it is ideal for RPM sending in harsh environments. The opto-isolated switched output makes the ZED24 ideal for interfacing to PLC inputs, counters,timers or alarm circuits.
The ZED24 may be used in a variety of applications using target materials such as ferrous or stainless steel or aluminum. Applications include displacement, vibration, sorting and event capture. With its good sensitivity to small targets, and high speed switching, it is ideal for RPM sending in harsh environments. The opto-isolated switched output makes the ZED24 ideal for interfacing to PLC inputs, counters,timers or alarm circuits.
Electronics
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