Dwyer SFI-800-3/4 is a Sight Flow Indicator/Transmitter with a temperature range of -20 to 212°F (-29 to 100°C). It has an accuracy of ±5% of FS and requires a power supply of 8 to 28 VDC. The electrical connections include ground, normally open, normally closed, and 8 to 28 VDC. The output signals are normally open and normally closed switches with a maximum load of 100 mA and 28 VDC. This product is designed for use with compatible fluids and is constructed with materials such as polysulfone and UV stabilized polycarbonate. The pressure limits are 150 psi (SFI-800) and 125 psi (SFI-801), with a frequency range of 0 to 100 Hz. It can handle a maximum viscosity of 200 SSU and has electrical termination options for ground, 15 to 28 VDC input, and 1 to 10 VDC output.