Mỗi nhà sản xuất cung cấp các tính năng phụ trợ sẽ khác nhau về tầm quan trọng tùy thuộc vào các chi tiết cụ thể của ứng dụng. Điều quan trọng là nhìn vào cách mà trong đó các hệ thống này thực hiện các nhiệm vụ nêu dưới đây khi đánh giá. Như mọi khi, tham khảo ý kiến các nhà sản xuất trực tiếp cho bất kỳ tính năng cập nhật hoặc bổ sung trước khi chỉ định một hệ thống. . | CHAPTER 18 Auxiliary Features Each of the manufacturers provides auxiliary features that will vary in importance depending on the specifics of the application. It is important to look at the way in which each of these systems performs the tasks outlined below when evaluating them. As always consult the manufacturers directly for any updated or added features before specifying a system. A. DIAGNOSTIC SIGNALS ALARMS AND DISPLAYS All of the digital serial output systems covered provide many alarms and diagnostic signals that are displayed on the turnkey software packages provided with them. These are covered in detail in Chapter 20. This section will describe the information displayed locally on the instruments. 1. Chemtrac The model 2400D provides all indications via the local display. Counts from each size channel are displayed in sequence as well as the cell condition flow rate if an electronic flowmeter is used and serial data address. The counts displayed are in particles per milliliter and correspond exactly to the count values sent out to the data collection software. These counts are adjusted to the measured flow when an electronic flowmeter is used. 2. Met One The model PCX and PCT counters provide panel indicators for power cell condition and count alarm as a standard feature. They are labeled differently for units not configured with the local numeric display which might be confusing if 153 2001 by CRC Press LLC 154 A PRACTICAL GUIDE TO PARTICLE COUNTING both types of counters are used on the same system. These display lights are also used for verifying communications during system configuration. A local numeric count display is available on both the PCX and PCT as an option. The PCX local numeric count display provides a single user-selectable size range with counts in either total or normalized values although normalized values are determined from a fixed-flow setting and will not respond to measured flow from an electronic flowmeter. The displayed value
