Honeywell UDA2182 manual Typical Probe Installation

Appendices

15.15Appendix N – Sample Tap Electrode Mounting Recommendations

Overview

Many applications tap a sample from a main process stream and, after the flow has passed through the measurement manifold, it is discharged to a sink or floor drain.

Typical Probe Installation

A typical probe installation will find the probe mounted in a flow chamber or tee arrangement similar to what is shown in Figure 15-8. Key installation features are provision for flow rate adjustment, a water trap to assure that the probe remains immersed if sample flow is turned off and means to prevent a below atmospheric pressure within the manifold.

	AIR
	VENT
	Air vent prevents vaccuum
	in discharge to drain line
	avoiding air leaks and
	resulting problems.
	pH, ORP,
	Conductivity
	or DO
	PROBE
	3 - 6" Water trap
	keeps probe tip wet
	when sample water
	is turned off
	DRAIN
	OPTIONAL 3-WAY
	VALVE AND DRAIN
	FOR DISSOLVED
	OXYGEN INSTALLATIONS
	FLOW
	METER
FLOW	DRAIN

Figure 15-8 Typical Probe Installation

It is desirable for water to exit the manifold 3 to 6 inches above the sensor tip. This will insure that the sensor remains immersed if sample flow is turned off.

The air vent extension is sized so normal sample flow does not completely fill this tube. Its purpose is to prevent negative pressure within the manifold. Without this air vent, if for example the exit stream is discharged to a floor drain four feet below the manifold,

January 2009 UDA2182 Universal Dual Analyzer Product Manual 229