Hydac EVS 3104-A-0300-000 Turbine Flow Transmitter, 300 l/min

A turbine flow transmitter for hydraulic oil lines up to 300 l/min

The Hydac EVS 3104-A-0300-000 (HYDAC part number 905976) measures flow in hydraulic systems on the turbine principle: an impeller in the flow turns at a speed proportional to the flow, and the electronics convert the speed into a 4 to 20 mA signal. The housing is aluminium, the connections are G1 1/4 female at both ends and the pressure rating of this range is 5800 psi (400 bar).

Two additional G1/4 threaded holes in the housing take a pressure or temperature transmitter, which makes it possible to monitor flow, pressure and oil temperature at one measuring point without extra tees.

Technical specifications

Choosing the range

The EVS 3100 series has four ranges: 0020 (0.26 to 5.28 gpm), 0060 (1.59 to 15.9 gpm), 0300 (3.96 to 79.3 gpm) and 0600 (10.6 to 159 gpm). Selecting the range close to the real working flow gives the best resolution, because a turbine is least accurate at the bottom of its range. The 0300 size is a common fit for medium power units and pump lines of up to about 80 gpm. The 0600 version has a lower pressure rating of 4567 psi.

Code and limitations

EVS 3 1 0 X – A – XXXX – 000: 0 is the aluminium housing, 4 the Binder series 714 M18 plug (6 gives M12x1), A the 4 to 20 mA signal and 0300 the range. The calibration is for mineral oils at 30 cSt, and the catalogue states an accuracy of 2 percent of the actual value. A version for water-based fluids (EVS 3110) has a separate datasheet. Fit upstream straight pipe and a filter, as the turbine does not like solid particles. Datasheet E 18.331.2 is the USA edition.

Mount the transmitter in a straight section with the arrow in the direction of flow, filter the oil upstream, and keep magnetic metallic particles away from the turbine, because they affect the pick-up. After installation, bleed the line so that air does not pass through the turbine, and compare the reading against a known pump flow once during commissioning.

Turbine flow transmitters are sensitive to fluid viscosity and cleanliness, so state the oil grade, operating temperature and filtration level when you request a quote. A strainer or filter upstream helps to protect the rotor from particles and keeps the accuracy within the datasheet band.

Documents and quotation

The datasheet is attached. Please send the code, the oil grade and the working pressure. See also our flow indicators and switches range.

How the EVS 3104-A-0300-000 works

Inside the aluminium body of the EVS 3104-A-0300-000 the oil flow drives a turbine impeller. The impeller turns at a speed proportional to the volumetric flow. The electronics measure the impeller speed and convert it into a 4 to 20 mA loop current: 4 mA corresponds to the start of the range and 20 mA to 79.3 gpm (300 l/min). Because the instrument is powered from the loop itself (2-conductor technology), only two wires are needed between the transmitter and the PLC or display.

Turbine meters respond to the volumetric flow, but the drag on the impeller changes with viscosity. HYDAC calibrates the EVS 3100 with oil at 30 cSt and states a viscosity range of 1 to 100 cSt. The best accuracy is therefore reached when the working oil viscosity is close to the calibration viscosity; at very different viscosities, expect a larger deviation than the stated 2 % of the actual value.

Dimensions and wiring

The maximum load in the current loop depends on the supply voltage: R_L max = (U_B – 10 V) / 20 mA. At 24 V DC this gives 700 Ω, which is enough for a PLC input plus a panel indicator in series.

EVS 3104-A-0300-000 selection & ordering guide

• Housing material: 0 = aluminium.
• Electrical connection: 4 = male 4-pole Binder series 714 M18 (IP 65), as on this model; 6 = male M12×1 4-pole (IP 67 when an IP 67 connector is used). The mating connector is not supplied and is ordered separately from the accessories range.
• Signal: A = 4 to 20 mA, 2-conductor.
• Measuring range: 0020, 0060, 0300 or 0600, with weights of about 730, 860, 1410 and 1530 g.
• Modification: 000 = standard. Other measuring ranges and fluids are available on request.

Our team can help confirm the correct ordering code and the matching connector.

Installation & maintenance

• Install in the pressure or return line in the direction of the flow arrow, preferably in a straight pipe section so the flow reaching the impeller is steady.
• Tighten the G1 1/4 fittings to the specified torque and do not use the housing as a lever.
• Use the two G1/4 ports for a pressure transmitter (for example HDA series) or a temperature transmitter, or close them with suitable plugs.
• Keep the oil clean; particles can damage the impeller bearings and alter the reading. Check the zero and full-scale signal during routine maintenance.

Typical applications in Oman & the GCC

The EVS 3100 is designed for hydraulic and other fluid technology systems. Typical uses include pump performance and wear monitoring on power units, flow checks on hydraulic test benches, cooling-circuit flow supervision, lubrication oil flow monitoring and leak detection on mobile and industrial hydraulics. In Oman and the GCC, these applications appear in steel and aluminium plants, cement works, ports, and oil and gas service workshops where pump condition must be checked regularly.

Why source from Seven Star LLC

Seven Star LLC supplies HYDAC flow, pressure and temperature transmitters across Oman and the GCC. Request a quote for the EVS 3104-A-0300-000 together with the Binder connector and any pressure or temperature sensors for the additional ports.