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3098 Technical Manual Electrical Connections
3-11
3.6 System Connections (customer’s own equipment)
3.6.1 Non-hazardous areas
Power supply to Density Meter: 15.5V to 33Vdc, <20mA.
Power supply to PRT: 5mA max.
The frequency at which the meter is operating can be detected in one of two ways:
a. For the two-wire option, a 330Ω series resistor should be used in the +ve power line. The electrical connections to
be made are shown in Figure 3-6.1. The signal across the 330Ω resistor is greater than 2V peak to peak. The
minimum impedance of the signal measuring equipment should be 500kΩ. Where necessary, the 1nF capacitors will
block the power supply dc voltage to the measuring equipment.
b. For the three-wire option, the frequency can be measured directly. The electrical connections to be made are shown
in Figure 3-6.3.
3.6.2 Hazardous Areas
For details of hazardous area installations, please refer to safety instructions (30985018/SI).