ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 129

SENSOR INFORMATION (capacitance)
SuperGuard Capacitance Switch (LP15 Series): The SuperGuard level switch generates a pulse wave radio
frequency signal from the capacitance electrode located in the sensing tip of each sensor. When liquid comes
into contact with the sensing tip, the capacitance as measured by the sensor changes based on the dielectric
constant of the liquid. The guard circuit rejects the negative effects of coating buildup on the probe by
eliminating the coating signal path between the active and reference electrodes.
The sensor's operation may vary based on the dielectric properties of various application liquids. The
LP15 series sensor is factory calibrated to be used with liquids with a dielectric value between 20 and 80.
Liquids with a dielectric constant less than 20 will not be detected by an LP15 series sensor.
Table of Common Dielectric Constants: NOTE: Liquids with a dielectric constant less than 20 will not be
detected by an LP15 series level switch.
Acetone ..................... 21 Chlorotoluene .......... 4.7
Acetoaldehyde ....... 22.2 Chloroform .... 4.5 to 5.0
Acetyl methyl hexyl Chlorine, liquid ....... 2.0
ketone ........................ 28 Carbon tetrachloride 2.2
Alcohol ........... 16 to 31 Cyan ........................ 2.6
Ammonia ........ 15 to 25 Cyclohexane methanol
Acetic acid .... 4.1 to 6.2 .................................. 3.7
Butyl chloride .......... 9.6 D.I. Water ................. 20
Barium chloride 9 to 11 Ethyl toluene ........... 2.2
Benzene ................... 2.3 Ethyl alcohol ............ 23
Benzine .................... 2.3 Ethylene glycol ........ 37
Barium nitrate .......... 5.6 Ethylene oxide .......... 14
Bromine ................... 3.1 Ethylene dichloride
Chlorobenzene . 4.7 to 6 .......................... 11 to 17
LP15 Specifications:
Dielectric range:
Conductive range:
Configurations:
Part
Number
LP15 1405
LP15 1425
8 of 20
Ethylene chloride .. 10.5
Ethyl acetate ............ 6.4
Ethyl salicylate ........ 8.6
Ethyl stearate .......... 2.9
Ethyl silicote ........... 4.1
Formic acid .............. 59
Ferric oleate ............ 2.6
Freon ....................... 2.2
Glycerine .................. 47
Glycol ....................... 30
Glycol nitrite ............ 27
Gasoline ........... 2 to 2.2
Hydrochloric acid ... 4.6
Isobutyric acid ........ 2.7
>20 constants
>100 miromhos
Material
(body)
Polypropylene
Polypropylene
Isobutyl methyl ketone
................................... 13
Jet fuel ..................... 1.7
Lead carbonate ......... 18
Lead nitrate ............... 38
Methyl salicylate ..... 9.0
Methanol ................... 33
Methyl alcohol . 33 to 38
Margarine, liquid
........................2.8 to 3.2
Methyl acetate ......... 7.3
N-butyl formate ....... 2.4
Nitrobenzene ... 26 to 35
Sensor material:
Cable jacket mat'l:
Material
(cable)
Polypropylene
Polypropylene
LO900002
Nitrotoluene ............. 25 Trichloroethylene .... 3.4
Naphthalene .. 2.3 to 2.5 Trichloroacetic acid 4.5
Oils, vegetable 2.5 to 3.5 Terephthalic acid
Oils, mineral .. 2.3 to 2.4 ........................ 1.5 to 1.7
Oils, petroleum Thinner .................... 3.7
........................ 1.8 to 2.2 Urea ......................... 3.5
Oleic acid ................ 2.5 Vinyl chloride .. 2.8 to 6
Propane, liquid Vinyl alcohol 1.8 to 2.0
........................ 1.8 to 1.9 Water, 20°C ............. 80
Potassium nitrate Water, 100°C ........... 48
........................ 5.0 to 5.9
Potassium chloride .. 5.0
Stearic acid .............. 2.3
Toluene .................... 2.4
PP
PP
Thread
cable sensor
X
side side
(¾" NPT) x (¾" NPT)
(¾" R) x (¾"G)
E-1264
Step Three
Rev A