Uses
Water Level Control in:
- Cooling Towers
- Plating Tanks
- Washing Tanks
- Reverse Osmosis
- Fish Farms
- Fountains & Pools
- Aquariums
Level Switches - Water, Oil, & Gas - Noryl, Brass, & Stainless Steel
Level Switch – Model L-21
Wide Differential Level Switch
The L-21 is a low cost, high performance level switch made from highly durable plastics. It features a variable liquid level differential and a single point pump up/pump down level control.
The L-21 Level Switch can be ordered with level differentials of 1, 2, 3 or 5 inches. The L-21+ can be ordered with level differentials from 12 to 48 inches. The L-21’s large differential provides immunity to nuisance switch tripping due to wave action and turbulence. The large differential also provides very low cost single point pump-up/pump-down level control. No latching relay needed!
Maintenance and checkout is easy using any standard multimeter. Each unit comes with a detailed instruction manual and parts list.
|
Working Fluid Specific Gravity |
0.7 minimum |
|
Working Temp |
200˚F (93˚C) Maximum |
|
Working Pressure |
250 psig (1.724 MPa) |
|
Process Connection |
1 1/4" NPT |
|
Electrical Switch |
SPDT (single pole double throw) 15A |
|
Enclosure |
NEMA 6P / IP 67 |
Models
|
L-21+ & L-21N (NORYL®) WORKING PRESSURE: 250 psi max. continuous WORKING TEMPERATURE: 180˚F max. continuous. WETTED MATERIALS: Body, Float and Bushing: Noryl® (PPO) (10% glass fibers) screws + shaft: 316 stainless steel or Teflon® |
L-21VCR (FORTRON®) WORKING PRESSURE: 250 psi max. continuous WORKING TEMPERATURE: 200˚F max. continuous. WETTED MATERIALS: Body, Float and Bushing: Fortron® (PPO) (40% glass fibers) screws + shaft: HASTELLOY® C |
| L21 Group |
| L-21N |
| L-21VCR |
Specs
HYSTERESIS (Δ LIQUID LEVEL TO ACTIVATE/DEACTIVATE SWITCH)
≈ 5″ max. travel (N/VCR).
ELECTRICAL SWITCH CHARACTERISTICS
SPDT (single pole double throw) 15 A, 1/2 hp @ 125 or 250VAC .A @ 125VDC, .A @ 250VDC 4A @ 125VAC (Tungsten lamp load)
Note: Model L-21 employs magnetic coupling between float arm and switch body. Magnetic particles can accumulate on and around magnet housing which may affect proper operation. Please conduct appropriate fluid magnetic particle evaluation and operational tests prior to and during installation and use.
WORKING FLUID SPECIFIC GRAVITY
0.7 minimum
Diagram
Compatible Chemicals
L-21N
- Acetic Acid
- Ammonia Liquid 10%
- Chlorinated Water (Potable)
- Ethylene Glycol
- Glycolic acid
- Hydrochloric acid 20% – 37%
- Hydrofluoric acid 20%
- Hydrogen Sulfide Aqueous
- Mineral Oil
- Nitric Acid 10%-50%
- Phosphoric Acid 40%-100%
- Plating Fluids & Baths
- Sodium Hydroxide Solution 20%
- Soy Sause
- Sulfuric Acid 10%
- Vinegar
- Water Distilled
- Water Fresh
- Water Mine Acid
- Water Salt
- Whiskey & Wine
L-21CR
- Acetic Acid
- Ammonia Liquid 10%
- Benzene
- Diesel Fuel
- Ethylene Chloride
- Ethylene Dichloride
- Ethylene Glycol
- Glycolic acid
- Hydrogen Sulfide Aqueous
- Lubricants
- Mineral Oil
- Phosphoric Acid 40%-100%
- Propylene Glycol
- Sodium Hydroxide Solution 20%
- Sulfuric Acid 10%
- Water Distilled
- Water Fresh
- Water Mine Acid
- Water Salt
- Xylene
Related Products
-
Level Switch – Model L-8
- Adjustable for different specific gravity fluids
- Submersible NEMA 6
- 15 Amp microswitch
- Noryl or Fortron
- 1″x1¼” bushing included for standard float
-
Liquid Level Controller Model LC-1
- Automatic Pump Up / Pump Down Level Control
- Latching relay
- 120/240 VAC
- 1.5 HP/3.0 HP
- Use with any Level Switch
