Absolute Process Instruments APD 4059 D _ Bridge, strain gauge, load cell transmitter, isolated I/O. Fully isolated.
Cecomp Electronics, APD 4059 D, Isolated DC Amplifier for 1 to 4 Sensors, 85-265 VAC,9-30 VDC, 10-32 VAC Power
Features:
- Drive up to Four 350 Ω Bridges
- Adjustable Excitation Power Supply
- Sense Lead Compensation
- One Minute Setup for Hundreds of I/O Ranges
- Removable Plugs for Faster Installation
- Non-Interactive Zero and Span
- Full 3-Way Input/Output/Power Isolation
- Input and Output LoopTracker® LEDs
- Output Test or Calibration Resistor Options
Applications:
- Load Cell Weighing Systems and Scales
- Strain Gauge Pressure Sensors and Transducers
- Tanks, Scales, Extruder Melt Pressure, Crane Loads
The APD 4059 D accepts an input from one to four strain gauges, bridge type sensors, load cells, or pressure transducers. It filters, amplifies, and converts the resulting millivolt signal into the selected DC voltage or current output that is linearly related to the input.
The full 3-way (input, output, power) isolation makes this module useful for ground loop elimination, common mode signal rejection or noise pickup reduction.
The adjustable excitation power supply generates a stable source of voltage to drive from one to four 350 Ω (or greater) devices. Sense lead circuitry is included to cancel the effects of leadwire resistance, if required.
Input, output, excitation and zero offset are field configurable, via external rotary and slide switches. Offsets up to ±100% of span can be used to cancel sensor offsets or non-zero deadweights (taring). Non-interactive zero and span simplifies calibration.
Sink/Source Versatility
For maximum versatility the APD 4059 D milliamp output can be selectively wired for sinking or sourcing. This allows connection to any type of mA input receiving device.
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 output test button greatly aids in saving time during initial startup and/or troubleshooting. The test output level is potentiometer adjustable from 0 to 100% of output span. A calibration resistor switch replaces the test button.
Specifications Table:
| Input | 100 Ω to 10,000 Ω Bridges, 0.5 mV/V to 40 mV/V, 1-10 VDC Excitation |
| Output | 0-1 V to ±10 V or 0-2 mA to 4-20 mA (Sink or Source) |
| Strain Gauge Input |
Minimum: 0 to 5 mV range 0.5 mV/V sensitivity Maximum: 0 to 400 mV range 40 mV/V sensitivity Millivolt output range is determined by the sensor sensitivity (mV/V) and the excitation voltage: mV/V sensitivity X excitation voltage = total mV range |
| Input Impedance | 200 kΩ typical |
| Common Mode Rejection | 100 dB minimum |
| Calibration Resistor Options |
M01 option: Switch with calibration resistor inside module. M02 option: Switch for external (load cell) calibration resistor. |
| Excitation Voltage |
Switch Selectable: 0-10 VDC in 1 V increments Maximum Output: 10 VDC maximum at 120 mA Drive Capability: Up to four 350 Ω bridges at 10 VDC Fine Adjustment: ±5% via multi-turn potentiometer Stability: ±0.01% per °C |
| Sense Lead Compensation | Maximum leadwire resistance: 10 Ω with 350 Ω at 10 VDC |
| DC Output Ranges |
Voltage (10 mA max.): 0-1 VDC to 0-10 VDC Bipolar Voltage (±10 mA max.): ±5 VDC or ±10 VDC Current: 0-2 mADC to 0-20 mADC Compliance, drive at 20 mA: 20 V, 1000 Ω drive Current output can be selectively wired for sink or source |
| Output Calibration |
Multi-turn zero and span potentiometers ±15% of span adjustment range typical Zero offset switch: ±100% of span in 15% increments |
| Output Test |
Adjustable 0-100% of span |
| Output Ripple and Noise | Less than 10 mVRMS ripple and noise |
| Linearity | Better than ±0.1% of span |
| Ambient Temperature Range and Stability | -10°C to +60°C operating ambient |
| Response Time | 70 milliseconds (14.3 Hz) |
| Isolation |
1200 VRMS minimum Full isolation: power to input, power to output, input to output |
| Connectors | Four 4-terminal removable connectors, 14 AWG max wire size |
| Power | 89-30 VDC (either polarity) or 10-32 VAC, 2 to 5 Watts depending on number of load cells |
