Levelcom 100 - Pneumatic Connections; Port Identification and Usage; Tubing Arrangement and Air Quality

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Page 32

Pneumatic Connections

General

Pneumatic connections are made at

the bottom of the LevelCom 100

enclosure. The instrument is

supplied with fittings installed as

required by the options ordered.

Connections are 1/8” female NPT. If

it is necessary to install a fitting,

thread lubricant should be used

sparingly, with great care taken to

keep excess from entering the

manifold. Do not use PTFE tape on

any pneumatic connections to the

LevelCom 100. Fittings should be

made up only as tight as necessary

to be leak-free. The manifold is

aluminum, and can be distorted by using excessive installation force. Small fittings, such as

1/8” NPT do not require much torque to seal well. The pneumatic connection ports are

discussed below.

In the majority of cases, tubing connections are made only to Port 3, (Tank Sense) and Port

5, (Supply air). See Figure 18. These will usually be the only fittings present. The others

are only present if the relevant options were ordered.

Note: There is a filter between the compression fitting and the manifold body on the Port 5

the air supply fitting. This filter should not be removed from the manifold body. If different

fittings are required proper fittings should be obtained that will thread onto this filter.

Port 1 DRAIN is used at regular intervals by the LevelCom 100 to purge its manifold of any

water, oil or impurities, and to relieve all pressure to the internal sensor for periodic automatic

zero calibration. If desired, the DRAIN connection may be plumbed to a different location, so

that when the LevelCom 100 vents, the air will be directed elsewhere. Tubing is to be made

up tight and leak free and tubing connections must not obstruct flow or contain any valves.

Important Note: Tubing must be arranged so that the entire run slopes downward to the

open end. If liquid can be trapped in this tubing anywhere the hardware zero operation will

not work correctly and the machine accuracy will be affected. Use of clear plastic tubing is

recommended to aid in seeing possible problems with contaminated air.

Figure 18 Pneumatic Connections