A JWT sequencer can turn your analyzer into a multi-stream instrument. Just one process instrument can be used for multiple sample streams (the number is theoretically unlimited) and will operate completely unattended. Our sequencer includes a PLC mounted in an enclosure, an operator station for control, and a solenoid valve manifold for switching the sample streams to the instrument. The sequencer includes a complex computer program that controls all the functions necessary to provided accurate analysis for each sample, and to sequence streams as fast as possible

Our experience works for you. We have years of experience in this field, and have in-depth experience with most process analyzers. Anyone can make a sequencer. But few companies can make a sequencer that include the features of our sequencer, features that are designed to provide you with accurate chemistry control. The purpose of a chemical analyzer is to provide accurate readings, and to allow you to control your chemistry. For power plants, especially the latest generation, chemistry is of critical importance. Poor control increases the potential for corrosion and stress-corrosion cracking, and may result in expensive replacement of condenser tubes, turbine blades, and process piping. A poorly designed sequencer can affect the chemistry readings, and in the long run can result in disaster for the plant. Don't be fooled by cheap imitations. A JWT sequencer is the best that you can buy, and we back them up with a guarantee: Our sequencers will NEVER be proven to affect the chemistry readings when properly set up and installed, and we will gladly refund your money if you can prove otherwise.

Features of JWT Sequencers:

The features are almost too many to mention, but can be roughly grouped by our standard sequencers, and our custom sequencers. The standard sequencers are designed for one analyzer, and come prepackaged and include a set of features for most sequencing applications. Our custom sequencers can include any options you prefer, limited only by your imagination and budget, and come fully programmed and tested.

Standard Sequencers:

Can turn the sequencer OFF, or PAUSE the sequencer at any stream. In PAUSE, you can advance to any sample. Includes 1 dry contact output per stream, or one 4-20 mA output per stream.

Separate models are used for continuous analyzers or for batch type analyzers. The batch type analyzers must include an end-of-cycle contact closure to indicate when the current analysis cycle is complete.

Continuous analyzer models include an adjustable delay time. This is the length of time it takes the analyzer to settle out at the new reading after switching streams.

Concentration adjustment feature allows automatic change in cycle times when switching between samples of greatly differing concentration.

Analog output models provide track and hold for each sample stream. This makes the sequencer appear to the plant control system as one analyzer for each stream, and provides a continuous output. (The output is held at the last reading when on the other samples. )

Custom Sequencers:

Custom sequencers can perform the functions of the standard sequencers, but can also include many additional features.

Multiple analyzers can be sequenced in one sequencer. We recommend a larger operator station (a color touch-sensitive display is preferred) to improve the ease of control with multiple analyzers.

If you have a large control panel, we can include analog inputs for all the other analyzers. These can be displayed on the operator station, or transmitted to the plant control system via Ethernet, Modbus, or other protocol. Replacing analog wiring with a single communications cable results in a savings that will easily offset the cost of the sequencer.

Alarm displays to alarm chemistry readings, or other system alarms.

PID control for your chemical feed pumps.