Type 2390 and 2390B Contents (Continued) Sensor Connection Compartment Parts Removal and Re-installation . . . . . . . . . . . . . . . . . . . . . . . Removing the Lever Assembly . . . . . . . . . . . . . . Removing and Replacing the Flexure Strips . . Removing the Dry Span Scale . . . . . . . . . . . . . . Re-installing the Dry Span Scale . . . . . . . . . . . . Re-installing the Lever Assembly . . . . . . . . . . . .
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repair Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Type 2390 and 2390B Liquid Level Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 249 Series Sensor Insulator Assembly . . . . . . . . 30
Introduction
Figure 2. Typical Nameplate
Scope of Manual This instruction manual provides installation, calibration, maintenance, and parts ordering information for the Type 2390 and 2390B liquid level transmitters used with the 249 Series level sensors. A typical transmitter-sensor combination is shown in figure 1. Refer to the Principle of Operation section for a more comprehensive discussion of how the Type 2390 and 2390B liquid level transmitters operate.
uids, or the specific gravity (density) changes of a liquid. These changes exert a buoyant force on the displacer, which rotates the torque tube shaft. This rotary motion is applied to the transmitter, and the resulting current output signal is sent to an indicating or final control element. A wide variety of 249 Series sensors are used with the Type 2390 or 2390B transmitters.
249 Series Sensors
Only personnel qualified through training or experience should install, operate, and maintain this transmitter. If there are any questions concerning these instructions contact your Fisher Controls sales office or sales representative before proceeding.
! The Type 249, 249B, 249BF, 249C, 249K, 249L, and 249N sensors side-mount on the vessel with the displacer mounted inside a cage outside the vessel. (The Type 249BF is available only in Europe, Middle East, and Africa.) These sensors are called caged sensors.
Note
! The Type 249BP, 249CP, and 249P sensors topmount on the vessel with the displacer hanging down into the vessel. These sensors are called cageless sensors.
This manual does not include sensor installation instructions, maintenance instructions, or parts lists. For this information, refer to the appropriate sensor instruction manual.
! The Type 249V sensor side-mounts on the vessel with the displacer hanging out into the vessel (cageless sensor).
Product Description Type 2390 and 2390B Transmitters The Type 2390 or 2390B liquid level transmitter is used with the 249 Series sensors to measure changes in liquid level, the level of interface between two liq-
2
Specifications Specifications for a Type 2390 or 2390B transmitter are listed in table 1. Some specifications for an individual transmitter, as it comes from the factory, are found on the nameplate (figure 2).