MODEL 499A CL-01

MAINTENANCE

MAINTENANCE

Periodic maintenance and cleaning are required for best performance of the sensor. Generally, the membrane and fill solution should be replaced every one to three months. If the sensor is being used in water having conductivity less than about 100 µS/cm, it might be necessary to replace the fill solution (but not the membrane) more often. Sensors installed in harsh or dirty environments require more frequent maintenance. The optimum maintenance frequency is best determined by experience.

CAUTION

PRESSURIZED SPRAY INJURY

Before removing the sensor, be absolutely certain that the process pressure is reduced to 0 psig and the process temperature is lowered to a safe level!

CLEANING THE MEMBRANE.

Keep the membrane clean and free from dirt and algae. Clean the membrane with water sprayed from a wash bottle. Do not use tissues to clean the membrane.

REPLACING THE ELECTROLYTE SOLUTION AND MEMBRANE.

CAUTION

Fill solution may cause irritation. May be harmful if swallowed. Read and follow manual.

1.Unscrew the membrane retainer and remove the membrane assembly and O-ring. See Figure 16.

2.Hold the sensor over a container with the cathode pointing down.

3.Remove the fill plug and allow the electrolyte solution to drain out.

4.Inspect the cathode. If it is tarnished, clean it using a cotton-tipped swab dipped in baking soda or alumina. Use type A dry powder alumina intended for metallographic polishing of medium and soft metals. Rinse thoroughly with water.

5.Wrap the plug with one or two turns of pipe tape. Remove old tape first.

6.Prepare a new membrane. Hold the membrane assembly with the cup formed by the membrane and membrane holder pointing up. Fill the cup with elec- trolyte solution and allow the wooden ring to soak up the solution (usually takes several minutes).

7.Hold the sensor at about a 45-degree angle with the cathode end pointing up. Add electrolyte solution through the fill hole until the liquid over- flows. Tap the sensor near the threads to release trapped air bubbles. Add more electrolyte solution if necessary.

8.Place the fill plug in the electrolyte port and begin screwing it in. After several threads have engaged, rotate the sensor so that the cathode is pointing up and continue tightening the fill plug. Do not overtighten.

9.Place a new O-ring in the groove around the cathode post. Cover the holes at the base of the cathode stem with several drops of electrolyte solution.

10.Insert a small blunt probe, like a toothpick with the end cut off, through the pressure equalizing port. See Figure 16.

NOTE

Do not use a sharp probe. It will puncture

the bladder and destroy the sensor.

Gently press the probe against the bladder several times to force liquid through the holes at the base of the cathode stem. Keep pressing the bladder until no air bubbles can be seen leaving the holes. Be sure the holes remain covered with electrolyte solution.

11.Place a drop of electrolyte solution on the cathode, then place the membrane assembly over the cathode. Screw the membrane retainer in place.

12.The sensor may require several hours operating at the polarizing voltage to equilibrate after the electrolyte solution has been replenished.

6

Page 5 Page 7
Page 6
Image 6
Emerson PN 51A-499ACL01/rev.K specifications Maintenance, Cleaning the Membrane
Page 5 Page 7

PN 51A-499ACL01/rev.K specifications

The Emerson PN 51A-499ACL01/rev.K is a highly advanced and reliable control instrument tailored for industrial automation and process control applications. This device stands out due to its robust design and innovative technology, making it a prime choice for engineers seeking efficiency and precision in system management.

One of the main features of the 51A-499ACL01/rev.K is its exceptional accuracy in measuring and controlling various parameters. With its advanced sensing technology, it can provide real-time data, allowing operators to monitor conditions closely and make informed decisions that enhance overall process efficiency. Its high-resolution display presents critical information clearly, ensuring that users can easily interpret data and respond promptly.

The device is equipped with multiple communication protocols, enabling it to integrate seamlessly into diverse control systems. This versatility is vital in contemporary manufacturing environments that rely on interoperability among different devices and platforms. The 51A-499ACL01/rev.K supports standard communication interfaces like MODBUS, Ethernet/IP, and others, facilitating smooth data exchange and system integration.

Another significant characteristic is its robust construction, designed to withstand harsh industrial conditions. The device features an IP-rated enclosure that ensures durability against dust and moisture, making it ideal for use in challenging environments. The temperature rating allows operation in a broad range of conditions, further enhancing its applicability across various industries.

In terms of energy efficiency, the Emerson 51A-499ACL01/rev.K employs innovative power management technology. It minimizes energy consumption while maintaining high performance, aligning with current trends toward sustainability in industrial operations. This focus on energy efficiency not only reduces operational costs but also supports corporate sustainability initiatives.

The user-friendly design of the 51A-499ACL01/rev.K enhances accessibility, featuring an intuitive interface that simplifies configuration and programming. This ergonomic approach helps minimize the learning curve for new users and boosts productivity by allowing quicker setups and adjustments.

In conclusion, the Emerson PN 51A-499ACL01/rev.K represents a significant advancement in control technology, combining precision, durability, and user-friendliness into a single instrument. Its comprehensive features and capabilities make it an ideal solution for industries looking to optimize their control systems and improve operational efficiency.
Top Page Image Contents