Emerson Process Management 396P Section Maintenance, Automatic Temperature Compensator, Elements

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MODEL 396P and 396PVP

SECTION 6.0

 

MAINTENANCE

SECTION 6.0

MAINTENANCE

The Model 396P and 396PVP Sensors require mini- mum maintenance. The sensor should be kept clean and free of debris and sediment at all times. The fre- quency of cleaning by wiping or brushing with a soft cloth or brush is determined by the nature of the solu- tion being measured. The sensor should be removed from the process periodically and checked in buffer solutions.

WARNING

BEFORE REMOVING THE SENSOR, be absolutely certain that the process pres- sure is reduced to 0 psig and the process temperature is lowered to a safe level!

If the sensor will not calibrate, refer to your analyzer/ transmitter instruction manual for proper test proce- dures. If it is determined that the sensor has failed, it should be discarded and replaced.

6.1AUTOMATIC TEMPERATURE COMPENSATOR.

The temperature compensator element is temp- erature sensitive and can be checked with an ohm- meter. Resistance increases with temperature.

The 3K element will read 3000 ohms ± 1% at 25°C (77°F) and a Pt100 will read 110 ohms. Resistance varies with temperature for a 3K and Pt100 element and can be determined according to Table 6-2 or the following formula:

RT=Ro [l+R1 (T-20)]

Where RT = Resistance

T = Temperature in °C

Refer to Table 6-1 for Ro and R1 values

6.2 MODEL 396P & 396PVP pH SENSORS

4.2.1ELECTRODE CLEANING. If the electrode is coated or dirty, clean as follows:

1.Remove the sensor from process.

2.Wipe the glass bulb with a soft, clean, lint free cloth or tissue. If this does not remove the dirt or coating, go to Step 3. (Detergents clean oil and grease; acids remove scale.)

3.Wash the glass bulb in a mild detergent solution and rinse it in clean water. If this does not clean the glass bulb, go to Step 4.

CAUTION

The solution used during the following check is an acid and should be handled with care. Follow the directions of the acid manufacturer. Wear the proper protective equipment. Do not let the solution come in contact with skin or clothing. If contact with skin is made, immediately rinse with clean water.

4.Wash the glass bulb in a dilute 5% hydrochloric acid solution and rinse with clean water. Soaking the sensor overnight in the acid solution can improve cleaning action.

NOTE

Erroneous pH results may result immedi- ately after acid soak, due to reference junction potential build-up.

Replace the sensor if cleaning does not restore sensor operation.

TABLE 6-1

Ro and R1 VALUES FOR TEMPERATURE

COMPENSATION ELEMENTS

Temperature

Ro

R1

Compensation Element

 

 

3K

2934

.0045

Pt100

107.7

.00385

 

 

 

TABLE 6-2

TEMPERATURE vs RESISTANCE OF AUTO

T.C. ELEMENTS

 

Resistance

Temperature °C

(Ohms) ±1%

 

3K

Pt100

0

2670

100.0

10

2802

103.8

20

2934

107.7

25

3000

109.6

30

3066

111.5

40

3198

115.4

50

3330

119.2

60

3462

123.1

70

3594

126.9

80

3726

130.8

90

3858

134.6

100

3990

138.5

 

 

 

25

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Contents Combination pH/ORP Sensor Essential Instructions Hazardous Area InstallationModel 396P and 396PVP Combination pH/ORP Sensor List of Figures Features and Applications Section Description and SpecificationsPercent Linearity SpecificationsOrdering Information Recommended Accessories for First Time InstallationsPart Description Other Accessories for Models 396P and 396PVPMounting Section InstallationUnpacking and Inspection 40396P01 Dimensional Drawing40396P02 40396P04 40396P03Low Flow Cell PN Wiring Matrix Guide Section Wiring Model 396P-01Wire Functions for Model 396P with and without Preamplifier 40396P15 40396P13 40396P08 Section Refer to Section Wiring Models 396P-02 and 396PVPConnector Pins Their Functions Section Section Section 20. Wiring to Model 54e pH/ORP With Variopol 40396P24 40396P2523. Wiring Model 396P-01 to Model Xmt-P-HT-10 ORP Calibration Section Start UP and CalibrationAutomatic Temperature Compensator Section MaintenanceCompensation Elements ElementsModel 396P and 396PVP ORP Diagnostic Message Section Diagnostics and TroubleshootingDescription of Problem Remedy UG!1SSTroubleshooting Without Advanced Diagnostics Description Quantity NON-WARRANTY Repair Warranty RepairSection Return of Material GeneralReturn of Material WarrantySpecifications subject to change without notice

396P, 396PVP specifications

Emerson Process Management has established itself as a leader in the automation industry, providing innovative solutions that enhance operational efficiencies and improve process control. Among its notable offerings are the 396PVP and 396P pressure transmitters, designed to meet the needs of various industrial applications.

The 396PVP model is equipped with advanced features that facilitate high-performance measurements in both challenging and standard environments. This pressure transmitter utilizes a piezoresistive sensor, allowing for accurate and reliable pressure readings. It supports a wide range of measurement capabilities, making it suitable for liquids, gases, and vapors across diverse industries. With an impressive pressure range, the 396PVP caters to various applications, from HVAC systems to more demanding scenarios in oil and gas extraction.

In terms of technology, the 396PVP leverages digital communication protocols, including HART and FOUNDATION Fieldbus, enabling seamless integration into existing control systems. This capability not only enhances data transmission but also facilitates remote monitoring and diagnostics, significantly reducing downtime and maintenance requirements. The transmitter is also designed with an intuitive interface, allowing for straightforward configuration and calibration via handheld devices or software.

On the other hand, the 396P model offers exceptional performance for demanding pressure measurement requirements. It features robust construction materials that ensure durability and resistance to harsh environments, making it an ideal choice for applications in chemical processing and power generation. The 396P is designed with a fast response time, ensuring real-time data accuracy, which is critical for maintaining process integrity and safety.

Both models showcase Emerson's commitment to safety and reliability. They are built to meet stringent industry standards, which guarantees quality performance in hazardous locations. Furthermore, the embedded diagnostic features provide real-time health monitoring, alerting operators of any potential issues before they escalate, thereby safeguarding operations.

In summary, the 396PVP and 396P pressure transmitters from Emerson Process Management exemplify cutting-edge technology and high-quality engineering. With their advanced sensing capabilities, robust design, and integration-friendly features, these transmitters are essential tools for optimizing process control and enhancing overall productivity in various industrial settings. Whether it's for precise measurements in a chemical plant or reliable pressure readings in an oil field, the 396 series offers the performance and durability required to thrive in today's demanding operational landscapes.
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