Teledyne 4220 installation and operation guide Flow Meter Options and Accessories

4220 Flow Meter

Section 5 Options and Accessories

Greasy substances, being nonconductors of electricity, weaken the electrical potentials formed between the glass mono-electrode and the solution, slowing or halting the response altogether.

The pH Sensor operates satisfactorily mounted either horizon- tally or vertically in the stream. However, horizontal mounting is more secure, and presents less of a debris trap.

•Simple suspension of the probe is not recommended, particularly in streams of high velocity, or those that carry debris.

If you mount the pH probe vertically, mount it securely. Do not just hang it from the top of the pipe by its cable. Suspending the probe in the stream is not stable.

For horizontal mounting, the probe fastens to a sensor carrier that snap-fits to an Isco mounting ring. The mounting rings fit various diameters of round pipes 15" diameter and smaller. For larger pipes, use the Isco Universal Mounting Ring. For installation details, refer to the instruction sheet supplied with the mounting ring.

The mounting rings are held in place by the outward force of spring pressure in the smaller sizes and by a screw arrangement in the larger sizes. After mounting the probe in the ring or strap, route the cable out of the stream so it will not trap debris that could clog the sewer.

Mount the pH Module within 25 feet of the probe, but in a location higher than the highest anticipated level for the flow stream. The amplifier box is sealed and will withstand tem- porary submersion, but this should be avoided.

Note

Do not connect an Isco pH probe and temperature probe to the 201 module at the same time. The “Temperature Probe” input on the 201 module is for use ONLY with non-Isco pH probes that do not have built-in temperature sensing. The Isco pH probe contains its own integral temperature sensor, which, if connected in parallel with a separate temperature probe, will cause erroneous readings.

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