Emerson Combination pH/ORP Sensor Section Description and Specifications, Physical Specifications

MODEL 399VP pH/ORP SENSOR	SECTION 1.0
	DESCRIPTION AND SPECIFICATIONS

SECTION 1.0.

DESCRIPTION AND SPECIFICATIONS

1.1FEATURES AND APPLICATIONS

1.2PHYSICAL SPECIFICATIONS

1.3ORDERING INFORMATION

1.1 FEATURES AND APPLICATIONS

The Rosemount Analytical Model 399VP Sensor meas- ures the pH or the Oxidation Reduction Potential (ORP) of aqueous solutions in pipelines, open tanks, or ponds. It is suitable for virtually all applications where a low cost sensor is required. The combination electrode features a ceramic junction constructed in an annular design around the pH/ORP sensitive membrane. The double or triple junction reference cell configuration is resistant to process solutions containing ammonia, chlorine, cyanides, sulfides, or other poisoning ions.

The glass electrode is housed in a molded Tefzel body and sealed with Viton1 O-rings to guard against process leakage. The cable end of the sensor is also sealed, eliminating cable shorts caused by exposure to moisture. This construction makes for a highly chemical resistant disposable sensor and does not require electrolyte replenishment.

The custom glass electrode is available with either a standard hemi bulb or an optional flat bulb to best meet your application needs. Flat glass is advanta- geous in abrasive or coating applications that etch or build up on the glass respectively. In coating applica- tions, such as slurries, the flat surface allows the process flow to act as a scrubbing agent to reduce coating and maintenance whereas in abrasive appli- cations pitting from silicates and other similar materi- als is minimized by the flat surface to provide longer life. The hemi bulb is ideal for general purpose use and for those processes requiring greater accuracy over the entire pH range

Installation is easily achieved through the wide variety of mounting configurations. The Model 399VP fea- tures 1 in. (MNPT) front and rear facing connections for insertion, submersion or flow through pH and ORP applications.

1.2 PHYSICAL SPECIFICATIONS

Materials of Construction: Tefzel, glass, ceramic and Viton (also, Platinum for ORP sensor)

Process Connections: 1 in. MNPT

Interconnecting Cable: None - must use mating VP cable

Measured Range: pH: 0-14*

ORP: –1500 -+1500mV *Percent Linearity over pH range:

	Hemi Bulb	Flat Bulb
1-2 pH	94%	93%
2-12 pH	99%	98%
12-13 pH	97%	95%

Temperature Compensation: Automatic 0 to 85°C (32° to 185°F) (Temperature compensation is not required for 399 ORP when used with Models 1060, 1023 or 1181 ORP)

Maximum Pressure: 790 kPa abs (100 psig) at 65°C (Refer to Graph A below)

Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)

1Registered trademarks of E. I. du Pont de Nemours and Company.

GRAPH A. Pressure/Temperature Limitations

for Model 399VP

1