finder 72 Series Level Control Relays For Conductive Liquids User Guide
- June 3, 2024
- finder
Table of Contents
finder 72 Series Level Control Relays For Conductive Liquids
ABOUT US
Founded in Italy in 1954, Finder has been designing and manufacturing a wide
range of electromechanical and electronic components for the residential and
industrial sectors. Today, thanks to a global vision, Finder distributes these
products around the world through a network of 28 company-owned subsidiaries
and more than 80 trade partnerships.
Finder is an international family made up of more than 1300 individuals, all
united by the same values and passion for our products.
14 500
Different products to satisfy a myriad of applications. From products at the
heart of automation to the control of machines, power, time, temperature,
liquid level, light and much more.
OUR PRODUCTS CARRY MORE CERTIFICATIONS THAN ANY OTHER RELAY MANUFACTURER
FINDER IS AN ITALIAN BRAND WITH A WORLDWIDE PRESENCE
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Applications everywhere
Agriculture
- Level control for irrigation channels and systems
- Level control for water tanks, reservoirs or underground wells
- Level control for sewage tanks or mixing plants
Residential and commercial sectors
- Level control for pools, fountains and aquariums
- Flood control for laundries and utility rooms
- Submerged pump control
Food
- Condensation control for refrigerated cabinets
- Level control for the beverage sector
- Level control of drinking water tanks
Water treatment and distribution
- Control of filling and emptying of tanks
- Control of emptying and filling functions for treated drinking water
- Level control for sewage treatment plants
- Controlling the supply of hot water heated by solar energy
Level control relays for conductive liquids
Type 72.01 and 72.11
Are suitable for the level control of conductive liquids.
2 electrodes for control about a single level, or 3 electrodes for control
between minimum and maximum limits.
- Emptying or filling functions
- Control about a single level or between min/max limits
- LED indicator of contact status
- 1 CO (SPDT) 16 A – 250 V AC
- Positive logic output
- Nominal voltage AC or DC
- Special version for low loads down to 5 V, 1 mA
- Reinforced insulation between supply/contacts/electrodes (6 kV – 1.2/50 μs)
- 35 mm rail (EN 60715) mount
| Filling function | ✔ | ✔ |
|---|---|---|
| Emptying function | ✔ | ✔ |
| Sensitivity | Adjustable 5…150 kΩ / 5…450 kΩ | Fixed 150 kΩ |
| Run-on time | 0.5 – 7 seconds | Fixed 1 second |
| LED indicator | ✔ | ✔ |
| Contact configuration | 1 CO (SPDT) | 1 CO (SPDT) |
| Rated current/Maximum peak current | 16/30 A (UL 15 A 1/2 Hp) | 16/30 A (UL 15 A |
1/2 Hp)
Nominal voltage AC (50/60 Hz)| 24, 110…125, 230…240, 400 V| 24, 110…125,
230…240 V
Nominal voltage DC| 24 V| 24 V
Insulation: supply/contacts/electrodes| 6 kV| 6 kV
Electrical life at rated load| 100,000 cycles| 100,000 cycles
Ambient temperature| – 4…+140°F| – 4…+140°F
Functions| FL = Level control by Filling, Long (7 s) run-on delay
EL = Level control by Emptying, Long (7 s) run-on delay
FS = Level control by Filling, Short (0.5 s) run-on delay
ES = Level control by Emptying, Short (0.5 s) run-on delay
| F =Level control by Filling, Run-on time fixed at 1 s
E =Level control by Emptying, Run-on time fixed at 1 s
Examples types of liquids
Suitable liquids
- Potable water
- Well water
- Water (general use
- Rainwater
- Seawater
- Sewage
- Wine – Ethylene glycol (aircraft wing deicing)
- Liquid fertilizer
- Milk, beer, coffee
- Liquids with low-percentage alcohol
Unsuitable liquids
- Demineralized water
- Fuels
- Oil
- Liquids with high-percentage alcohol
- Liquid gas
- Paraffins
- Paint
Filling functions (FL/FS)
Example with 3 electrodes
Emptying functions (EL/ES)
Example with 2 electrodes
| Product code | Description | Nominal voltage |
|---|---|---|
| 72.01.8.024.0000 | Sensitivity range adjustable (5…150)kΩ | 24 V AC |
| 72.01.8.024.0002 | Sensitivity range adjustable (5…450)kΩ | 24 V AC |
| 72.01.8.125.0000 | Sensitivity range adjustable (5…150)kΩ | 110…125 V AC |
| 72.01.8.240.0000 | Sensitivity range adjustable (5…150)kΩ | 230…240 V AC |
| 72.01.8.240.0002 | Sensitivity range adjustable (5…450)kΩ | 230…240 V AC |
| 72.01.8.240.5002 | Sensitivity range adjustable (5…450)kΩ, for low loads |
230…240 V AC
72.01.8.400.0000| Sensitivity range adjustable (5…150)kΩ| 400 V AC
72.01.9.024.0000| Sensitivity range adjustable (5…150)kΩ| 24 V DC
72.11.8.024.0000| Sensitivity fixed 150 kΩ| 24 V AC
72.11.8.125.0000| Sensitivity fixed 150 kΩ| 110…125 V AC
72.11.8.240.0000| Sensitivity fixed 150 kΩ| 230…240 V AC
72.11.9.024.0000| Sensitivity fixed 150 kΩ| 24 V DC
Probes and accessories for liquid level control for Types 72.01 and
72.11
A wide and diverse range of electrodes allow the Types 72.01 and 72.11 level control relays to work in many diverse applications.
Normally 2 electrodes are used for the control about a single level, although 3 probes can be used for level control between “Minimum” and “Maximum” levels.
It is possible to use the tank itself as the common electrode (terminal B3), if it is made of a conductive material.
If two different levels are required to be set-up within the same tank, it is possible to do this by simply utilizing two level control relays.
Type 072.01.06 – Cable length: 6 m (1.5 mm2)
Type 072.01.15 – Cable length: 15 m (1.5 mm2)
Suspended electrode for conductive liquids. Suitable for level monitoring
in wells and reservoirs not under pressure. All materials used are compatible
with food processing applications.
Type 072.02.06 – Cable length (blue color): 6 m (1.5 mm2)
Suspended electrode for swimming pools with high levels of chlorine, or in
salt-water pools with high levels of salinity.
High quality electrode material: stainless steel (AISI 316L) with high
corrosion resistance.
Max. liquid temperature +212°C. Type 072.31
Suspended electrode for wells and tanks.
High quality electrode material: stainless steel (AISI 316L) with high
corrosion resistance.
Plastic parts made of polypropylene for good resistance to aqueous solutions
of inorganic salts, acids, alkaline solutions, alcohol, some oils and washing
solutions.
Physiologically harmless and therefore particularly suitable for use in the
food and pharmaceutical sectors. Max. liquid temperature +176°C.
Type 072.51
Electrode holder suitable for metal tank with G3/8” fitting. The tank can be
used as the common electrode and electrically wired to the common terminal B3
of the 72.01 / 11 relay by utilizing the threaded part and fixing nut as a
terminating point. The total length of the probe is obtained by connecting an
appropriate number of 072.500 electrodes. High quality electrode material:
stainless steel (AISI 316L) with high corrosion resistance.
Max. liquid temperature +212°C.
Type 072.53
Electrode holder with three poles, for overhead mounting in wells and tanks.
The total length of the probes is obtained by connecting an appropriate number
of 072.500 electrodes. High quality electrode material: stainless steel (AISI
303) with high corrosion resistance.
Max. liquid temperature +158°C.
Type 072.503
Electrode separator (for three pole electrode holder 072.53).
Use to avoid electrodes touching where otherwise they might sway due to their
length. Type 072.500 – Electrode – 475 mm long, M4 thread, stainless steel
(AISI 316L)
Type 072.501 – Electrode connector, M4 thread, stainless steel (AISI 316L).
Multiple electrodes may be interconnected to provide required length.
Illustration of interconnection of electrodes.
Type 072.11
Floor water sensor, flood warning. Designed for the detection of and signaling
the presence of floor surface water and for the detection of condensation (for
example in refrigerated cabinets). 
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4191 Capital View Drive, Suwanee, GA 30024 – U.S.A.
770-271-4431
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