Determine how to drive and read an unknown three wire pressure sensor
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This three-wire pressure transducer pinout, drive type, and electrical specifications are unknown. It should be a typical industrial transducer. I have tried assuming it is an amplified device with a 0-5, 0-10 V output, or 4-20 mA output. No combination of wiring results in a correlated output signal.
The transducer comes out of a late 1990’s designed Agilent 1100 HPLC scientific pump, where it measures the output pressure up to 440 bar (6500 PSI). It is part of a pulse dampener, so I wish to keep it intact. I do not have access to the drive PCB any longer.
The markings are: Agilent Technologies Part No. 5065-9907 Revision A Date code 21/03 PA-23R / 81088 440 bar
I suspect this may be a Keller OEM transducer. Keller’s currently advertised lines do not include a 23R, but they follow a similar product naming convention – PA-23R could make sense.
The transducer has three wires in a 0.100 pitch ribbon cable, so unshielded, One is black striped.
I’ve monitored the drive voltage while powering the transducer for repetitive pulses as evidence of a microcontroller.
The only configuration that shows any response at all is #5 below. The output voltage decreases slightly as pressure increases. However, the output voltage depends on the supply voltage. This seems unusual if it is an amplified transducer.
The pin-to-pin resistance matrix is:
| pin 1 | pin 2 | pin 3 | |
|---|---|---|---|
| pin 1 | x | 1.52 MΩ | 13.98 MΩ |
| pin 2 | 1.52 MΩ | x | 11.12 MΩ |
| pin 3 | 13.94 MΩ | 11.08 MΩ | x |
The pin-to-pin voltage drop is:
| pin 1 | pin 2 | pin 3 | |
|---|---|---|---|
| pin 1 | x | 1.64* V | open |
| pin 2 | 0.73 V | x | open |
| pin 3 | 1.93 V* | 1.72 V | x |
*Values decreased when attaching the meter.
Powering the transducer with a 15 VDC supply current limited to 60 mA gives this result set:
| Config | pin 1 | pin 2 | pin 3 | current (mA) |
|---|---|---|---|---|
| 1 | +15 | 0 | out | 43 mA |
| 2 | +15 | out | 0 | 16 mA |
| 3 | 0 | +15 | out | 22 mA |
| 4 | 0 | out | +15 | 0 mA |
| 5 | out | +15 | 0 | 0 mA |
| 6 | out | 0 | +15 | 0 mA |
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asked 1 hour ago
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- I googled Keller and found the following datasheet, manual, and spec: (1) download.keller-druck.com/api/download/feHh39CHy7AhquSGgv3UCS/…, (2) download.keller-druck.com/api/download/8p9KraBomWGhZsPhncEEc/en/…. (3) Electrical Connection – GSP Plug EN 175 301-803-A (DIN 43650) – tlfong01 1 hour ago
- could you upload a picture? – Abel 1 hour ago
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Keller 23 Connection
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answered 3 mins ago
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