GESTRA LRG 16-40, Оригинальная инструкция по установке

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5
Explanatory Notes
Scope of supply
LRG 16-40
1 Level electrode type LRG 16-40
1 S. S. joint ring
∅
33 x 39, form D, DIN 7603 (made of 2.4068), bright annealed
1 Terminating resistor 120 Ω
1 Installation manual
LRG 16-41
1 Level electrode type LRG 16-41
1 S. S. joint ring ∅ 33 x 39, form D, DIN 7603 (made of 2.4068), bright annealed
1 Terminating resistor 120 Ω
1 Installation manual
LRG 17-40
1 Level electrode type LRG 17-40
1 S. S. joint ring
∅
33 x 39, form D, DIN 7603 (made of 2.4068), bright annealed
1 Terminating resistor 120 Ω
1 Installation manual
Description
The conductivity electrodes LRG 16-40, LRG 16-41, LRG 17-40 consist of a TDS (= Total Dissolved
Solids) monitoring electrode for conductivity measurement, a temperature sensor for detecting the fluid
temperature and a conductivity transmitter that is fully integrated in the terminal box.
The conductivity electrodes LRG 16-40, LRG 17-40 work according to the conductometric measurement
principle and use two electrodes. The conductivity electrode LRG 16-41 also uses the conductometric
measurement principle but works with four electrodes. All three electrode types monitor the electrical
conductivity of electrically conductive fluids.
Together with the TDS controller LRR 1-40 and an operating device type URB or SPECTOR
control the con -
ductivity electrode LRG can be used as conductivity limiter and continuous blowdown controller in steam
boilers and (pressurized) hot water plants or as conductivity meter in condensate and feedwater systems.
The conductivity electrodes LRG 16-40, LRG 17-40 are particularly well suited for steam boilers with
low TDS content, e.g. in steam regenerators, high-pressure boilers or condensate vessels.
The conductivity electrode LRG 16-41 is designed for industrial boiler plants up to PN 40 and max.
admissible conductivities of 8000/6000 μs/cm according to TRD/EN.
The data exchange between the conductivity electrode LRG, the control and operating equipment and
other devices is effected by the CAN-Bus to ISO 11898, using the CANopen protocols.
Function
LRG 16-40, LRG 17-40
A measuring current of variable frequency flows through the fluid and creates a potential gradient
between the measuring electrode and the measuring tube. The potential gradient is evaluated as
measuring voltage U
U
.
LRG 16-41
The conductivity electrode consists of two current and two voltage electrodes. The current electrodes
send the measuring current U
I
with a fixed frequency into the fluid, thereby creating a potential
gradiant between these electrodes. This potential gradiant is then detected by the voltage electrodes
and evaluated as measuring voltage U
U
.