Operating Instructions
Electrode Reay
ES1S
SU0072e.DOC 03/03
© IER Eberhard Henkel GmbH
Subject to change without notice
Wiring Diagram 3: Empty Alarm
MAX Electrode
Ref. Electrode
E0
E1
E2
L+
N-
Control Voltage
Alarm Signal
22
21
24
14
11
12
Overflow Alarm (low signal):
Alarm signal relay K1 is released when MAX
electrode is immersed or if interference/power f
occurs at electrode
t l
Overflow Alarm (high signal):
Alarm signal relay K1 is pulled in when MAX
electrode is immersed or if interference/power f
occurs at electrode
t l
---> Connect relay K1 to terminal 12.
K1
ON
OFF
1
Power Supply
L1 N (AC)
+ - (DC)
Wiring Diagram 4: Overflow Alarm
Please observe instructions concerning EMC compliant installation,
wiring and operation of electronic measuring and control devices!
(Info Sheet no.: SU0066. 1998)
Initial Start-Up
•
Check for correct supply voltage! Observe data printed on the
serial plate!
•
Make sure that
polarity is not
reversed if DC supply
power is used!
•
Check electrode
connections!
Adjustments
The transparent front
panel can be pried out
with a screwdriver.
Sensitivity: Potentiometer P1 and DIP switch S2 are used to
adjust sensitivity to the conductivity of the liquid to be
monitored.
Procedure: The poorer the conductivity of the liquid, and the
greater the distance between the electrodes, the
higher the sensitivity must be adjusted.
Attention: Erroneous switching may occur if sensitivity is set too
high
!
Working Current / Closed-Circuit Current: DIP switch S1
ON delay / OFF delay: Potentiometer P2
Flutter suppression is provided in order to prevent excessive
switching in the event of disturbances at the surface of the liquid.
Potentiometer
Full Left
Full Right
P1: Sensitivity
min.
max.
P2: Delay
approx. 0.5 sec
approx. 3 sec
DIP Switch
ON
OFF
1
working current
closed-circuit current
2
high sensitivity
5 - 150 k
Ω
low sensitivity
1 - 70 k
Ω
Status Indication
Green LED lights up
ready for operation
Yellow LED lights up
output relay pulled in
Response when Supply Power is Switched On
Setting MIN
Immersed
MIN+MAX
Immersed
MIN+MAX
Exposed
Open-circuit current
+ no DT
0
0
0 -> 1
Working c no DT
0 -> 1
0 -> 1
0
Open-circuit c DT
1 ->DT->0
1 ->DT->0 0 -> 1
Working c DT
0 ->DT->1
0 ->DT->1 0
0 = Relay released
1 = Relay pulled in
DT = Delay time
Mounting in electrical cubicles and boxes
cubicles with increased inner temperature:
notice the power loss -->
distances between the relays not less than 0,5 cm !
Operating Range
The capacitive resistance of long cables reduces the sensitivity of
the electrode controls.
A typical, shielded, 3 conductor PVC cable has a capacitance of
approx. 100 pF per metre. This results in an operating range which
is dependent upon cable length and the resistance of the liquid in
accordance with the following diagram:
0
20
40
60
80
100
120
140
160
50
100
150
200
250
300
Cable Length (m)
R
esis
ta
n
ce
o
f L
iq
u
id
(
k
ΩΩΩΩ
)
Operating Range
Operation is not possible
Figure 1: Operating Range
Maintenance
If the device is used for its intended purpose, no maintenance is
required.
Troubleshooting
Green LED does
not light up.
•
No supply power
•
Device is defective
Yellow LED
lights up, but the
relay does not
pull in.
1
•
Measurement cable is interrupted
•
Liquid is not conductive enough
•
Contaminated electrodes (insulating layer)
•
Device is defective
Yellow LED
lights up, but the
relay does not
release
•
Short-circuited measurement cable
•
Electrodes bridged with conductive
contamination
•
Sensitivity is set too high
•
Device is defective
1
DIP switch 1 in "working current" position
IER Meß- und Regeltechnik
Eberhard Henkel GmbH
Innstrasse 2
68199 Mannheim
Tel. +49 (0)621 84224-0
z
z
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Fax: +49 (0)621 84224-90
e-Mail: [email protected]
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Internet: www.IER.de
green LED
"Ready"
yellow LED
"Output Relay"
DIP Switch 2
"Sensitivity"
Potentiometer
"Delay Time"
Potentiometer
"Sensitivity"
DIP Switch 1
"W ork/<O-C. Current"