KOTRON
®
R.F. 2-WIRE
Level Transmitter
®
INSTRUCTION MANUAL AND PARTS LIST
DESCRIPTION
Kotron two-wire level transmitters are designed to measure
either liquid or certain dry bulk media. The transmitter is usu-
ally mounted integrally with the probe.
The 24 V DC 4 mA base current is the supply to the unit.
Changes in the level of the medium change this current
between 4 and 20 mA in the two-wire loop.
This transmitter is available with a variety of options includ-
ing an analog meter and rigid or flexible probes. This
instruction manual applies to 24 V DC models only.
OPERA
TING PRINCIPLE
The amount of capacitance developed in any vessel, is
determined by the size (surface area) of the probe, the
distance from the probe to its ground reference (e.g. tank
wall), and the dielectric of the medium it is measuring.
If the probe’s mounting position is fixed, and the dielectric
value of the medium is constant, then the amount of
capacitance developed in any vessel becomes dependent
upon the probe’s total surface area.
Adjusting the combination of the probe’s diameter and
length (and of course its proximity to ground) in any given
application can generate the necessary capacitance
required by the electronic circuitry.
As media rises and falls in the tank, the amount of
capacitance developed between the sensing probe and the
ground also rises and falls. This change in capacitance is
converted into a pulse wave form, proportional to the
change in level. The amplifier then converts the proportion-
al pulse signal into a 4-20 mA output signal.
UNP
ACKING
Unpack the instrument carefully
. Inspect all units for dam-
age. Report any concealed damage to carrier within 24
hours. Check the contents of the packing slip and purchase
order. Check and record the serial number for future refer-
ence when ordering parts.
AGENCY APPROV
ALS
Agency
Approval
A
TEX
II
1G EEx ia
II
C T6, Intrinsically safe
Intrinsically safe:
Class
I
, Div
. 1, Groups A, B, C & D;
Class
II
, Div
. 1, Groups E, F & G;
FM/CSA
Class
III
CSA approval only valid with insulated probes.
Explosion proof:
CSA
➀
Class
I
, Div
. 1, Groups C & D;
Class
II
, Div
. 1, Groups E,F & G;
➀
Consult factory for proper selection data.
