Absolute Process Instruments APD 7500 _ transmitter. Fully isolated.
Cecomp Electronics, APD 7500, DC to Frequency Transmitter, 85-265 VAC, 60-300 VDC Power
Features:
- 24 Selectable Inputs and 30 Selectable Outputs
- Setup via Rotary Switches and Easy-to-use Tables
- Zero and Span Output Calibration Potentiometers
- 1200 V Full Isolation Input/Output/Power
- Adjustable Low Frequency Cutout
- Input and Output LoopTracker® LEDs
- Functional Test Push Button
Applications:
- Analog to Frequency for Totalizers and Counters
- Use With APD 7580 for Remote Monitoring
The APD 7500 accepts a DC voltage or current input and provides an optically isolated frequency output that is directly proportional to the input. Common applications include pulse counting or totalizing of DC process signals from devices such as flow transmitters, analog signal transmission over long distances, or analog inputs into PLCs. The full 3-way (input, output, power) isolation makes this module useful for ground loop elimination, common mode signal rejection or noise pickup reduction.
A low frequency cutout potentiometer can be adjusted to disable the output when the input falls below a pre-determined level. The APD 7500 can be field-configured via external rotary and slide switches. Common ranges are on the module label, however, virtually unlimited combinations are possible.
The APD 7500 has an open drain MOSFET (open collector) output which requires a user supplied external power supply and pull-up resistor allowing the module to be interfaced with a wide variety of devices. To convert the output to a powered TTL output, simply jumper terminals 1 and 2.
Sink/Source Versatility
For maximum versatility the input can be selectively wired for sinking (unpowered) or sourcing (powered) milliamp output. The 13 VDC loop excitation supply can be used to power a milliamp current loop if required. The input can also be wired for an externally powered loop.
LoopTracker
API exclusive features include two LoopTracker LEDs (green for input, red for output) that vary in intensity with changes in the process input and output signals. These provide a quick visual picture of your process loop at all times and can greatly aid in saving time during initial startup and/or troubleshooting.
Output Test
An API exclusive feature includes the test button to provide a fixed output (independent of the input) when held depressed. The test output level is potentiometer adjustable from 0 to 100% of the output span. The output test button greatly aids in saving time during initial startup and/or troubleshooting.
Specifications Table:
| Input | 0-50 mV to ±10 VDC, 0-1 mA to 4-20 mA (Field rangeable voltage or milliamps) |
| Outputs | Field rangeable 0-100 Hz to 0-30 kHz |
| DC Input Ranges |
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| Input Impedance |
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| Input Loop Power Supply | 13 VDC nominal, regulated, 25 mADC, max. ripple <10 mVp-p (May be selectively wired for sinking or sourcing mA input) |
| Frequency Output Ranges | Switch selectable
|
| Output Waveform and Logic | Square wave, 50% duty cycle. Normal acting, output increases with increasing input |
| Output Drivers |
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| Cutout Controls |
Red output LED blinks if either cutout level is near trip point |
| Output Calibration | Multi-turn non-interactive zero and span potentiometers
|
| Output Test/Override | Front momentary button or external contact closure sets output to test level. Potentiometer adjustable 0-100% of span. |
| Linearity | Better than ±0.4% of span |
| Ambient Temperature Range and Stability |
|
| Response Time | 70 milliseconds nominal |
| Isolation |
|
| Installation Environment |
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| Connectors | Four 4-terminal removable connectors, 14 AWG max wire size |
| Power | 85-265 VAC, 50/60 Hz or 60-300 VDC, 2.5 W maximum |
