Finder 72.01.9.024.0000 Level Control Relay

Name: Finder 72.01.9.024.0000 Level Control Relay – Datasheet
Brand: Finder
SKU: 72.01.9.024.0000

Level control for conductive liquids with adjustable sensitivity

The 72.01.9.024.0000 is a level control relay for conductive liquids from the Finder 72 series. It senses the liquid through simple rod electrodes using a low alternating voltage and switches a 16 A changeover contact, so it can start and stop a pump or open and close a filling valve without a float switch. Supply is 24 V DC and the housing is 35 mm DIN rail mounted.

Sensitivity is adjustable from 5 to 150 kilohm, so the relay can be set for clean water, process water or conductive solutions of different salinity. A switch selects between filling and emptying control and between a short (0.5 s) and long (7 s) run-on delay, which prevents the output from chattering on a rippled liquid surface. Three electrodes give control between a minimum and a maximum level, and one electrode gives control about a single level.

Technical specifications

Parameter	Specification
Order code	72.01.9.024.0000
Decoding	72 series; 0 = level control relay with adjustable sensitivity; 1 = 1 CO; 9 = DC supply; 024 = 24 V; contact material 0 = AgNi; option 0 = maximum 150 kilohm
Function	Filling or emptying control, switch selectable; single level or between minimum and maximum levels
Sensitivity range	5 to 150 kilohm, adjustable
Run-on time	0.5 s or 7 s, switch selectable
Electrode voltage / current	4 V AC / 0.2 mA
Maximum cable length, electrode to relay	200 m (maximum capacitance 100 nF per km)
Supply voltage	24 V DC; operating range 20.4 to 26.4 V DC
Rated power	2.5 VA / 1.5 W
Contact configuration	1 CO (SPDT)
Rated current / peak current	16 A / 30 A
Rated voltage / maximum switching voltage	250 V AC / 400 V AC
Rated load AC1 / AC15 (230 V AC)	4000 VA / 750 VA
Single-phase motor rating (230 V AC)	0.55 kW
DC1 breaking capacity (24 / 110 / 220 V)	16 A / 0.3 A / 0.12 A
Minimum switching load	500 mW (10 V / 5 mA)
Electrical life at rated load AC1	100,000 operations
Insulation	Reinforced, 6 kV (1.2/50 microseconds), between supply, contacts and electrodes (see isolation note below)
Ambient temperature	-20 to +60 degC
Protection category	IP 20
Terminals	Screw; maximum 1 x 6 mm2 or 2 x 4 mm2 solid; 8 mm strip length; 0.8 Nm
Power lost to the environment	1.5 W without contact current; 3.2 W at rated current

Electrodes, variants and isolation

The 72.01 needs electrodes: the Finder range lists suspended electrodes for conductive liquids (072.01.06 with a 6 m cable and 072.01.15 with a 15 m cable), and the datasheet gives the wiring for filling and emptying with two or three electrodes (B1 maximum, B2 minimum, B3 common). The 72 series also includes the 72.11 with fixed 150 kilohm sensitivity, the 72.42 priority change relay and the 72.51 modular level control relay with window function.

Important for 24 V DC models: the datasheet states that there is no electrical isolation between electrodes and supply on the 24 V DC types (72.x1.9.024.0000). For SELV applications a non-grounded SELV supply must be used, and on a grounded PELV supply none of the electrodes may be grounded. The 24 V AC versions and the 72.51 use an internal isolating transformer and do not have this restriction.

What to confirm before ordering

Confirm the supply voltage (24 V DC for this code; 24 V AC, 110 to 125 V, 230 to 240 V and 400 V versions exist), the liquid conductivity range, the cable length to the electrodes and the electrode material compatible with the liquid. The relay is for conductive liquids only; it does not suit oils or distilled water. Related items are listed in the automation accessories category.

Documents and quotation

The Finder 72 series datasheet (VII-2026 edition) is attached. It contains the ordering information, electrode wiring diagrams, function diagrams and accessories for the full series. Please send the order code, quantity and delivery location through the quotation form for availability from Seven Star LLC.

Relay, contactor and power supply families

The range runs from step relays and modular contactors to safety relays with forcibly guided contacts and switch mode power supplies for 35 mm rail. Each series has a datasheet with ordering codes, coil data, contact ratings, derating curves and approvals, so a part can be specified or replaced by its full type code rather than by series name alone.

Ordering Finder products: what we need

Quote the complete ordering code, including coil voltage and contact variant, together with the quantity, the supply voltage and frequency of the installation and any approvals the project requires. With that information the matching Finder version can be confirmed against the datasheet before a quotation is issued.

Frequently Asked Questions