Model 591 Features • Pressure Transmitter, Cable Suspended, Integral Electronics 4-20 mA signal, 2-wire loop Small size is easy to install Fits 0.75 in NPT (23 mm) and easily slides into a 1.0 in (27 mm) pipe Resistant to down hole pumps Ranges 1 ft to 2500 ft (0.3 m to 762 m) in water Support cable up to 4000 ft (1219 m) long Unaffected by algae and buildup Surge protectors Optional cable support clamp Sludge nose optional for dirty liquids Second vent tube in cable to check down hole sealing Maintenance free operation Description Output Signal: The Delta Controls Model 591 Pressure Transmitter incorporates both sensor and electronics units in a single potted module that is protected by a Viton® sealed heavy stainless steel body. The lower body, sealed to an electrical cable, is supported from the well head. A vent tube in the cable connects and references the sensor to atmospheric pressure. The detected pressure, linearly proportional to the height of water above, converts it to a 4-20 mA signal equivalent to the liquid's level. It is maintenance free, and, unlike capacitance / admittance type devices, Model 591 is unaffected by algae growth and sludge coating. Calibration is 'bucket' checked without the unit being installed in a well or pit. The 591 is also useful for measuring tank levels. The flexible cable is easy to install, even with minimal head room. The small body diameter allows installation through a 0.75 inch NPT hole. The optional Tefzel cable jacket and Hastelloy® resistant to most corrosive agents. C-276 body are Loop Impedance: Adjustments: Basic Non-Interactive: Vent Tube: Over Pressure: Operating Temperature: Intermittent Temperature: Compensated Temperature: Accuracy: Thermal Error: Barometric Effect: Model 591 Specifications Technology: Supply Power: Silicon strain gauge 13 DCV to 35 DCV 2-wire loop powered 4-20 mA, isolated 550 Ω at 24 DCV, 1100 Ω at 35 DCV 30% ≤ 100% of range Zero ≤ 30% Desiccant filter or isolation bladder 2X range 35 psi min (2.5 bar) without damage 3X range 1000 psi min (70 bar) without rupture -20 °F to +180 °F (-29 °C to +82 °C) -40 °F to +220 °F ( -40 °C to +104 °C) +30 °F to +130 °F (-1 °C to +55 °C) (higher available) ≥ ± 0.25% FS ± 0.02% FS/ °F max None 132 | Pressure > Model 591 | deltacnt.com