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Installation and Configuration Manual 19
Installation Procedure Accuracy ConsiderationsElectrical ConnectionsIntroduction
Chapter 3
Electrical Connections
This chapter contains details and wiring diagrams for connecting the 3098 specific gravity meter to
7950/51 signal converters and flow computers, and more generally to other equipment in both
hazardous and non-hazardous situations.
3.1 Introduction
The electrical connections to the 3098 specific gravity meter are made to the gas density meter held
inside the enclosure. When installed in hazardous areas, connections between the meter and the power
supply/readout equipment must be completed through zener safety barriers [or galvanic isolators].
The electrical cable enters the enclosure (if supplied, see Safety guidelines on page 1) through a cable
gland assembly and then passes into the amplifier housing.
The meter terminal layout is shown in Figure 3-1.
The amplifier housing has two chambers. The one nearest the cable gland axis contains the terminals
for connection to the meter/signal processing instrument. The other chamber contains the maintaining
amplifier unit. The amplifier board is encapsulated in a circular plastic container, with the complete
module secured by a keyway and a centrally positioned clamping screw. Behind the amplifier there is
an interconnect terminal board which links the sensor to the maintaining amplifier, and the amplifier
to the user connect board (see Figure 3-2).
Figure 3-1 Main terminal board connections
123
4567
8
9
1
10 11 12
SIG A
SIG B
PRT