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Series 220/221 Instruction Manual Chapter 2 Installation
Pulse Output Connections
The pulse output is used for a remote counter. When the preset volume or
mass (defined in the totalizer settings, see page 3-6) has passed the meter, the
output provides a 50 millisecond square pulse.
The pulse output requires a separate 5 to 36 VDC power supply. The pulse
output optical relay is a normally-open single-pole relay. The relay has a
nominal 200 volt/160 ohm rating. This means that it has a nominal on-
resistance of 160 ohms, and the largest voltage that it can withstand across
the output terminals is 200 volts. However, there are current and power
specifications that must be observed. The relay can conduct a current up to
40 mA and can dissipate up to 320 mW. The relay output is isolated from the
meter electronics and power supply.
Figure 2-16. Isolated Pulse Output with External Power Supply
Optional Backlight Connection
The Sierra Model 220 has an optional backlight connection provided. It is in-
tended to be powered by a separate 12 to 36 VDC power supply or by the
pulse power input. Both options are shown below.
The Sierra Model 220 has an optional backlight connection provided. It is in-
tended to be powered by a separate 12 to 36 VDC power supply or by the
pulse
IM-22 2-21