Manual

ST5484E 2-Wire Seismic Vibration Transmitter

Document 9162

Rev. T (Oct 2013)

1. Overview

The Model ST5484E Seismic Vibration Transmitter combines a vibration sensor and signal

conditioner in a single package for sensing machinery vibration level and transmitting a

proportional 4-20 mA signal directly to a PLC, DCS, monitor, or computer. The 2-wire flying lead

version is shown at right. Versions with 4 wires, terminal blocks, or MIL-type connector are also

available.

The transmitter has no moving parts and is encapsulated in a stainless steel housing. Each

transmitter is factory calibrated to the sensitivity marked on the label. An optional dynamic

signal output can be specified.

2. Mounting

It is important the transmitter body be solidly mounted to the machine surface. Refer to section 6 on transducer placement.

Different machine preparations are required for the two basic transmitter mounting styles; NPT (National Pipe Thread) and

machine thread (UNF and Metric). Transmitters with the NPT type mounting stud are secured by the thread engagement and

the base of the transmitter does not come in contact with the machine surface. On the other hand, transmitters with the

machine thread studs must make contact with the machine surface. The base of the transmitter must make square and

direct contact. This requires preparing the surface of the machine with a 1 1/2 inch counter bore (surfacing tool). This tool

can be used with a portable drill equipped with a magnetic base but care must be taken so that the tapped and threaded hole

is perpendicular to the machined surface. The transmitter must make contact all the way around its base surface. Contact

Metrix for more detailed instructions for using a counter bore.

If installing a transmitter with a standard 1/4 inch NPT stud, drill a hole using a 7/16 inch bit, 5/8-7/8 inch deep. Then tap

using a 1/4 - 18 NPT (tapered pipe tap). Hand tighten the transmitter and then turn an additional 1 to 2 turns using a wrench

on the wrench flats. Do not use a pipe wrench. A pipe wrench can apply extreme forces to the body and potentially damage

electronic components. A minimum of five (5) threads of engagement should be made. A 1/4 inch to 1/2 inch NPT bushing is

available for mounting the transmitter in existing 1/2 inch NPT holes. Also, a Model 7084 Flange Adapter can be used

between the transmitter and the machine surface when there is not enough surface thickness to drill and tap a hole. The

flange adaptor mounts with three small screws.

If installing a transmitter with one of the straight machined thread sizes, follow standard drill and tap procedures. Be sure to

not drill a hole larger that the counter bore pilot diameter before using the counter bore to prepare the machine surface.

Drill out the hole with the correct tap drill size after preparing the surface.

The sensitive axis of the transmitter is in line with the mounting stud. The transmitter can be oriented in any (0 to 360

degree) position.

Metrix ST5484E - Typical Transmitter Placement

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