Level Switch - Elko EP HRH-7 Manual De Instrucciones

ELKO EP, s.r.o.
Palackého 493
769 01 Holešov, Všetuly
Czech Republic
Tel.: +420 573 514 211
e-mail: elko@elkoep.com
www.elkoep.com
Made in Czech Republic
02-20/2017 Rev.:0
Characteristics
• high IP65 protection makes it ideal for use in demanding conditions
• the switch monitors the level in wells, reservoirs, tanks, tankers, containers, etc.
• in one device you can choose the following confi gurations:
- single switch with single-state monitoring
- single switch with double-state monitoring
• selection function of: pump up (fi lling) or pump down (emptying)
• adjustable time delay of output (0.5 - 10 s)
• adjustable hysteresis (5 - 100 kΩ)
• measuring frequency 10 Hz prevents polarization of liquid and raising oxidation of
measuring probes
• measuring circuits are galvanically separated from the power source of the product
and circuits of the relay contact by enhanced insulation according to EN 60664-1 for
overvoltage category III.
• output contact 1x changeover 16 A / 250 V AC1
Description
PUMP SENS 3 4 5 DELAY
2 6
1
1 7
UP min 8
0.5
9
DOWN max
10
2
3 PUMP SENS DELAY
3 4 5
2 6 [s]
1 7
UP min 0.5 8
9
DOWN max 10
H Un
4
C
D
PE A1 A2 16 15 18
5
6
PG13.5 PG13.5
1. Selection of function
[s]
2. Probe sensitivity settings
7
3. Supply voltage indication
4. Terminals for connecting probes
8
5. Open connecting terminal PE
6. Supply voltage terminals
7. Delay setting
9
8. Adjustment elements (inside device)
9. Output indication
10. Output contacts
10
HRH-7

Level switch

Symbol
C
D
H
Function
Un
max
LEVEL
min
15-18
LED
Un
max
LEVEL
min
15-18
LED
The relay is designed for monitoring the level of conductive fl uids with the option of
selecting functions: replenishing and draining (PUMP UP or PUMP DOWN).
An AC current is used for measuring to prevent polarization and electrolysis of fl uid and
unwanted oxidation of measuring probes. Three probes are used for measuring: H - upper
level, D - lower level and C - common probe. Ifusing a tank made from conductive material,
it is possible to use the tank itself as probe C.
If it is necessary to monitor only one level, there are two connection options:
1. Inputs H and D are connected to a single probe - in this case the sensitivity is decreased
to half (2.5... 50 kΩ).
2. Inputs H and C are connected and the probe is connected to input D - in this case, the
original sensitivity remains (5... 100 kΩ).
It is also possible to connect probe C with a protective conductor of the power system (PE).
To limit undesirable switching by various infl uences (contamination of probes with
deposits, moisture, etc.), it is possible to set the device sensitivity based on the conductivity
of the monitored fl uid (corresponding „resistance" of the fl uid) in a range of 5 to 100 kΩ.
To limit the infl uence of unwanted switching of output contacts caused by swirling of the
fl uid surface in the tank, it is possible to set a delay in the output reaction from 0.5 - 10 s.
1 / 3
A1 16 18
LEVEL
A2 15
Function PUMP UP
t t t1 t t
Function PUMP DOWN
t t t1 t t
EN