| 4220 Flow Meter |
| Section 4 Submerged Probe Installation |
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Assembling the Rings | The scissors mechanism will work best if the respective assembly |
| is installed to allow the scissors to expand approximately in the |
| middle of the adjustment. Do not overtighten the mech- |
| anism. It is designed to flex somewhat to provide a positive lock, |
| once moderately tightened. |
| When assembling the ring sections, make sure the tongue sec- |
| tions are correctly inserted into the slotted sections. A flat blade |
| screwdriver can help slide the tongue sections through the slots |
| and over the securing buttons. In most cases, it is easiest to |
| assemble the base and extensions above ground, (without con- |
| necting into a circle), before entering the manhole. Then you can |
| pass it down into the manhole. (Do not drop it; this large |
| assembly can be badly bent.) Once maneuvered into the pipe, you |
| can install the scissors mechanism. Under varying conditions, |
| different pipes may require different ways to install the par- |
| ticular assembly. |
| Do not try to install the larger ring assemblies in pipes during |
| conditions of high flow. Always try to install during times of |
| lowest flow, for reasons of safety as well as ease of installation. |
| The hardware kit provides plastic cable ties to secure probe |
| cables along the back of the ring. It also includes flat head bolts |
| and nuts you can use to bolt sections of the ring assembly |
| together. This is recommended when installing the ring in larger |
| pipe sizes, where significant flow exists. Bolting the tongue sec- |
| tions together can greatly increase safety and prevent the |
| assembly from being torn apart. |
Attaching the Probe | Remember that if the probe is not installed in the bottom center |
| of the channel, you must enter a zero level offset. |
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|
| Note |
| There are five pairs of countersunk holes on the base section |
| |
| Isco’s |
| use them to mount the probe carriers or the probes them- |
| selves. |
