Sferag

Spherag sensors, controllers and monitoring components

Spherag equipment belongs to the world of remote water management: probes that measure what is happening in the ground, in a tank or inside a pipe, and controllers that act on those readings and send them onwards. Here you will find that sensing and switching hardware — conductivity and temperature probes, submersible level sensors, pressure transducers, soil moisture and soil tension instruments, a solar-powered irrigation controller, plus the small electrical parts that sit between a sensor and the unit reading it.

Almost everything in this range is a low-voltage DC device with either an analogue or a digital output. That matters when ordering, because the correct part is decided as much by the supply voltage and the signal type as by the quantity being measured. Two sensors can read the same value and still be incompatible with your installation.

Sensors by what they measure

Water quality — the ES-2 electrical conductivity and temperature sensor combines two readings in a single IP68 probe, running on 12 VDC with an SDI-12 digital output. Conductivity is the usual way of following dissolved salts and overall mineral load in water that is stored, recirculated or dosed.
Level — the Atlas stainless steel level sensor is a submersible unit supplied on a 50 m cable, rated IP68 and powered at 3.3 VDC. Hydrostatic level sensors of this kind are hung in tanks, buffer vessels, wells and reservoirs, so the cable length has to suit the depth plus the run back to the cabinet.
Pressure — the Spherag pressure sensor has a 1/2″ male thread in stainless steel, a 30 bar range and a 3.3 VDC supply. It screws into a tee, manifold or filter port to follow line pressure.
Soil moisture and temperature — the Atlas Sentek sensor, part reference TH-SS-0010, works at 12 VDC and reports moisture and temperature from the root zone.
Soil water tension — the Irrometer tensiometer in stainless steel, 30 cm long, with a wide 9–30 VDC supply window, measures how hard plants must work to draw water rather than how much water is present.

Controllers, relays and signal handling

The Atlas X2 solar irrigation controller drives two stations, is powered at 9 VDC and communicates over NB-IoT, the narrowband cellular standard used where there is no local network or mains supply. Because it is solar-fed, the components around it are chosen for low current draw — which is exactly why a latching relay appears in this range. The Schrack RT78725, listed as an Atlas type, is a 16 A 12 VDC latching relay: it holds its switched state after a short pulse instead of drawing coil current continuously.

The Sensor Hub ATX is a 4-channel 4–20 mA signal splitter. A 4–20 mA current loop normally feeds one receiver; a splitter lets the same measurement reach a controller, a datalogger and a display without the loop collapsing. Check how many channels you actually need before ordering, and confirm whether your loop is powered by the sensor or by the receiving device.

How to identify the right part

Supply voltage — this range spans 3.3 VDC, 9 VDC and 12 VDC, with the tensiometer accepting 9–30 VDC. Match the sensor to the voltage your controller or hub actually puts out.
Output and protocol — SDI-12 digital sensors and 4–20 mA analogue loops are not interchangeable. Note which input your controller offers before choosing.
Mechanical fit — for the pressure sensor, confirm the 1/2″ male thread against the port on your manifold. For probes, measure the installed depth and the cable run separately.
Ingress protection — IP68 units are intended for permanent immersion; enclosures and relays are not, and belong in a housing.
Part references — codes such as TH-SS-0010 and RT78725 are the quickest way to order a like-for-like replacement. Photograph the label before removing an old sensor.

Spherag at PoolParthub.com

Stocked here are the sensing and control items from the Spherag catalogue that are most often replaced or added to an existing installation: conductivity, level, pressure, soil moisture and tension sensors, the Atlas X2 two-station controller, the four-channel signal splitter and the latching relay used alongside them.

These are the components that wear, get damaged by cable strain or immersion, or simply need to be extended to a second measuring point. Grouping them on one page makes it straightforward to compare supply voltages, output types and mechanical fittings side by side, so the replacement you order drops into the same position as the part it is replacing.