pH probe
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pH probe |
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  CDi Main | CDiComm | Controller | CDiNet | CDiBrowser | Outputs | Temp
| DO | Wiring | Calibration | Pricing
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Very high impedance, isolated pH amplifier and probe  |
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 The pH measurement is treated a little differently in the CDi due to the extremely high
resistance of the pH glass. The minute current produced by the probe cannot be reliably transmitted over long cable
runs. Therefore the amplifier is taken out, and placed in close proximity of the probe.  Output:
-600mV to +600mV for 0-14pH. Low-impedance output allows long cable runs.You Get: Galvanically isolated amplifier and enclosure.Quick
connector with 4 gold contacts. Options: Shielded,
4-wire instrumentation cable. |
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| BNC Cable Entry | |
 To simplify
probe attachment and seal-out humidity, we use a slit grommet type of fitting. |
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| pH Temperature Dependency | |
 The pH amplifier hardware was specifically
designed for intensive aquaculture applications, where pH is maintained at a value of around 7.00 (+- 0.2pH) and
temperature at about 30C (+-5degC).In order
to reduce circuit complexity (price), hardware temperature compensation is not implemented in this design. The
table shows pH temperature dependency at pH values around 7.00pH is negligible. |
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| Pertinent Documentation | |
 pH
Amplifier Assembly | CDi99 Wiring | CDi99 Keyboard Calibration | |
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