Siemens CA 333 Series Especificaciones descargar pdf (Pagina 8)

SD74

2.0 INSTALLATION

See Figure 2-1 for mounting dimensions and connections. The two basic mounting positions of the positioner are

normal, where the nameplate is on the bottom, and inverted, where the nameplate is on top. Valve design and

desired valve position when the input is at maximum determine whether the positioner should be mounted normal or

inverted. Table 2-1 shows various positioner-actuator combinations when using a double-acting cylinder operator.

Table 2-2 shows various positioner-actuator combinations when using a single-acting spring-loaded or cushion-

loaded actuator. In both the single-acting and double-acting combinations, a fail-safe action is provided.

CAUTION

Exceeding the specified ambient temperature limits can adversely affect performance

and may cause damage.

2.1 PNEUMATIC CONNECTIONS

All connections are 1/4" N.P.T. except the gauge connections, which are 1/8" N.P.T. The recommended piping for

the positioner is 1/4" O.D. tubing, although any scale-free piping may be used. When making pneumatic

connections:

1. Blow out all piping before making connections to prevent dirt, chips, etc., from entering the positioner.

2. Use pipe sealant sparingly, and only on the male threads. A non-hardening sealant is strongly recommended.

3. Connect the positioner to a source of clean, dry, oil-free instrument air. See Instrument Air Requirements

below.

CAUTION

Pressure in excess of 150 psig to any connection may cause damage.

2.2 INSTRUMENT AIR REQUIREMENTS

Connect the instrument to a source of clean, dry, oil-free instrument air. Failure to do so will increase the possibility

of a malfunction or deviation from specified performance.

CAUTION

Use of process fluids other than instrument air is not recommended. No claim is made

as to the suitability of this product for use with other process fluids, such as hazardous

gases, except as listed on the appropriate certificate. Non-approved instruments are

suitable for use with instrument air only. Optional features and modifications such as

tapped exhaust do not imply suitability for use with hazardous gases except as listed on

the approval certificate.

There are many types of synthetic compressor lubricants. Some may not be compatible with the materials used in

construction of the instrument. Wetting of these materials by such an oil mist or vapor, etc., may cause them to

deteriorate. This may ultimately result in failure of the positioner. The following materials are in contact with

instrument air: aluminum, brass, Buna-N, and stainless steel.

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Siemens CA 333 Series Especificaciones Pagina 8