Emerson Process Management 396PVP Section Installation, Unpacking and Inspection, Mounting

MODEL 396P and 396PVP	SECTION 2.0
	INSTALLATION

SECTION 2.0

INSTALLATION

2.1 UNPACKING AND INSPECTION.

Inspect the outside of the carton for any damage. If dam- age is detected, contact the carrier immediately. Inspect the hardware. Make sure all the items in the packing list are present and in good condition. Notify the factory if any part is missing. If the sensor appears to be in satisfactory condition, proceed to Section 2.2, Mounting.

NOTE

Save the original packing cartons and materi- als as most carriers require proof of damage due to mishandling, etc. Also, if it is necessary to return the sensor to the factory, you must pack the sensor in the same manner as it was received. Refer to Section 6.0 for return instructions. If the sensor is to be stored, the vinyl boot should be filled with pH buffer solu- tion and replaced on sensor tip until ready to use.

CAUTION

Buffer solution, in the vinyl boot, may cause skin or eye irritation.

WARNING

Glass electrode must be wetted at all times (in storage and in line) to maximize sensor life.

2.2 MOUNTING.

The sensor has been designed to be located in indus- trial process environments. Temperature and pressure limitations must not be exceeded at any time. A caution label regarding this matter is attached to the sensor. Please do not remove the label. See Figure 2-1.

CAUTION

Internal electrolyte fill solution may cause skin or eye irritation.

Mounting Guidelines:

1.Shake the sensor in a downward motion to remove any air bubbles that may be present inside the tip of the pH glass.

2.Do not install the sensor on the horizontal. The sensor must be 10° off the horizontal to ensure accuracy.

3.Do not install the sensor upside down.

4.Air bubbles may become trapped in the sensor end between the glass bulb and the sensor body. This problem is most commonly encountered in areas of low flow or during calibration. Shake the probe while immersed in solution to remove bubbles. This problem can be avoided by ordering the sen- sor with the slotted tip (option -41).

In most cases, the pH sensor can simply be installed as shipped and readings with an accuracy of ± 0.6 pH may be obtained. To obtain greater accuracy or to ver- ify proper operation, the sensor must be calibrated as a loop with its compatible analyzer or transmitter.

2.2.1Flow Through and Insertion Mounting. Model 396P and 396PVP Sensors have a 1-inch MNPT process connection at the front of the sensor for mounting into a 1-1/2 inch tee or the process pipes. See Figure 2-1 through Figure 2-7 for installation con- figurations.

NOTE

LARGE PIPE WRENCHES MUST NOT BE USED TO TIGHTEN THE SENSOR INTO A FLANGE OR OTHER TYPE OF MOUNTING.

2.2.2Submersion Mounting. Model 396P and 396PVP Sensors also have a 1 inch MNPT process connection at the back of the sensor. Utilizing a stan- dard 1 inch union, the sensor may be mounted to a 1 inch SCH 80 CPVC or PVDF standpipe (see Figure 2- x). Tapered pipe threads in plastic tend to loosen after installation. It is therefore recommended that Teflon1 tape be used on the threads and that the tightness of the connection be checked frequently to assure that no loosening has occurred. To prevent rain water or con- densation from running into the sensor, a weatherproof junction box is recommended (see Figure 2-x). The sensor cable must be run through a protective conduit for isolation from electrical interference or physical abuse from the process. The sensor should be installed within 80° of vertical, with the electrode facing down. The sensor’s cable should not be run with power or control wiring.

1Teflon is a registered trademark of E.I. du Pont de Nemours & Co.

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