RF Admittance Level Meter

Detailed Product Description

level meter

RF Admittance Level Meter

RF admittance level meter, capacitance level meter

RF admittance level meter is a kindly improved capacitive measurement technique.

Measuring principle

RF admittance measurement technique is a capacitive measurement technique developed. That is, the concept of radio frequency output of a high frequency sine wave signal, used to measure the test sensor container and metal electrode between the container wall admittance. RF admittance measurement technique is superior to the traditional capacitive measuring technology, not only because it can be measured capacitance measurement of resistance at the same time.

Adhesion to a conductive liquid sensing electrode in the hanging material layer, the capacitance measurement will increase, this is not the true level of capacitance. Linked to only a very thin layer of material, its surface contains far less than the transverse cross-containing material surface, so the resistance of materials is very small, and linked to the resistance of materials is great. From the electrical point of view, the sensor electrode is expected to be linked to cover a considerable part of numerous infinitesimal by the capacitance and resistance of the composition of the transmission line, according to electrical theory, if the material hanging long enough, the material linked to the same capacitive reactance and resistance . Application of phase-sensitive detection circuit can be measured capacitance value and resistance value.

Since the measured total capacitance C = C Level + C linked material, and C linked to expected value of the capacitive reactance in the equivalent to R. C can be the current value of the objects. This RF admittance sensing technology can be an effective solution to the electrode materials linked to the issue of the roots, thereby enhancing measurement accuracy.

Performance Indicator.

Power   DC24V OR  AC220V,Power <1.6W

Display  LCD

Transmission output  4­-20m A  OR  1-5V

Alarm mode  There are two independent alarm relays, each with a normally open contact, the police can be a lower limit or upper limit of alarm, the margin can be set back.

Measur range  0-3000PF

Resolution  ≤0.2PF

Measurement accuracy  ±1%

Calibration  Any two-site calibration

Communications  485  OR  232

Instrument set

1^st parameter (When the password for the 132 or 1879, you can set)...

Set parameter	Name	Set Range	caption	Ex-factory value
SL0	Decimal point position	SL0=0	No show decimal point
		SL0=1	Show a decimal point
		SL0=2	Show two decimal places
		SL0=3	Show three decimal
SL1	Alarm 1 way	SL1=0	Not alarm
		SL1=1	Lower limit alarm
		SL1=2	Limit alarm
SL2	Alarm 2 way	SL2=0	Not alarm
		SL2=1	Lower limit alarm
		SL2=2	Limit alarm
SL3	Filter strength	SL3=0	Weak filtering effect
		SL3=1	Filtering role for the middle
		SL3=2	Filtering effect for high
ALM1	Set the value of the 1st  alarm
AH1	Set the margin back to the 1st  alarm
ALM2	The 2nd  alarm set
AH2	Set the margin back to the 2nd  alarm
SLL	Limits set under the Meter	When the instrument in the normal operation of state, show that the lower limit level, transmission 4mA output current
SLH	Set the upper limit of meter	When the instrument in the normal operation of state, show the upper limit level, transmission 20mA output current
L0	Field Calibration of the location of low level	After the calibration points and the corresponding level in the capacitor memory in E2ROM (Note 1)
H1	Field Calibration of high level positions	After the calibration points and the corresponding level in the capacitor memory in E2ROM
BOT	Bps select	There are five. Divided into 300,600,1200,2400,4800,9600
dE	No. instrument set	Users of the device number of the meter set (0-255)
Pb0	Shows the value of zero migration			0
KK0	Shows the value of magnification			1.000
Pb1	Migration of zero transmission output			0
KK1	Magnification transmission output			1.000

2^nd parameter (Only when the password set to 1897 in order to set up).

OU04	Calibration of the transmission output	Calibration of the transmission output is 4mA, the corresponding D / A value
OUT20	Calibration of the transmission output	Calibration of the transmission output is 20mA, the corresponding D / A value....

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