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	Voltage: 0-50 mVDC to ±10 VDC Current: 0-1 mADC to 0-20 mADC, 4-20 mA
Input Impedance	Voltage: 1 MÎ© minimum Current: 50 Î© typical
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 Low range - Minimum: 0-100 Hz, Maximum: Hz 0-1500, Increments: 100 Hz High range - Minimum: 0-2 kHz, Maximum: 0-30 kHz, Increments: 2 kHz
Output Waveform and Logic	Square wave, 50% duty cycle. Normal acting, output increases with increasing input
Output Drivers	MOSFET output: open drain, 24 VDC maximum Isink 50 mA maximum Von 0.6 V maximum at 50 mA Isink TTL output: Jumper terminals 1 and 2 TTL voltage: 1 to 12 Vp-p depending on load
Cutout Controls	Low cutout: Disables output if input is below low cutout level, potentiometer adj. 2% to 25% of range High cutout: Disables output above 120% of output span Red output LED blinks if either cutout level is near trip point
Output Calibration	Multi-turn non-interactive zero and span potentiometers Zero: ±15% of selected span typical Span: 50 to +20% of selected span typical
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	10°C to +60°C operating ambient Better than ±0.02% of span per °C stability
Response Time	70 milliseconds nominal
Isolation	1200 VRMS minimum Full isolation: power to input, power to output, input to output
Installation Environment	IP 40, requires installation in panel or enclosure For use in Pollution Degree 2 Environment Mount vertically to a 35 mm DIN rail
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

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