Inductive loop sensors IRV / IRT with control unit IRV10
The system is designed principally to detect metal rods and tubes, and consists of a control unit IRV
working in conjunction with one of a range of sensing coils IRT.
The effect of surrounding metal structures and objects can be cancelled by appropriate adjustments at
the control unit, and an overall sensitivity control enables different tube/rod sizes to be detected.
In general, the smallest rod of ferrous material that can be detected is one whose diameter is 5% of the
internal diameter of the sensing coil. For non-ferrous metals and stainless steel, 15% of the coil diameter
represents the minimum tube size.
The sensing coil is connected to the IRV10 control unit by a 2m cable with waterproof connector.
Longer cables are available on request. The coil is embedded in a robust plastic housing and is resin
sealed. A range of sensing coils are available, please see table of dimensions for types currently
produced.
Operating Instructions
24 volts AC or DC to terminals '24VDC/AC' and '0V':
If DC is used, please note the correct polarity must be observed. The green LED '24V' shows there is a
supply voltage connected.
Switch Output:
The output is conducting when the material to be detected is inside the sensing coil. This situation is
shown by the red LED 'Output' on.
Sensing Coil
The sensing coil is plugged into the supplied cable connector (2 core screened cable). When the
equipment is first installed, or when coils are changed, the adjustments described in section below
should be carried out.
Setting-up:
The 3 adjustment controls are balance (B), phase (A) and sensitivity (E). Each of these is a 4-turn
potentiometer without end stops. Clear sensing coil of tube/rod.
Set for maximum sensitivity, by turning (E) 4 full turns clockwise.
Alternately adjust potentiometers A and B until their respective associated LED, above each control,
extinguish. Repeat this process until all 4 LED are dark.
If necessary optimise the sensitivity (E) setting as described in next section.
Setting sensitivity (E):
The best setting for any material is set as follows:
Bring the rod or tube axially to the center of the sensing coil so that the front end of the material is level
with the front end of the coil.
Turn the potentiometer (E) anti clockwise until the 'Output' LED goes out. Then turn clockwise until the
LED just turns on again.
OPTRONIC AG CH-9403 GOLDACH UNTEREGGER STR. 53
TEL +41 71 8440200 FAX +41 71 8440210
Control Unit IRV10
Opto-isolator output:
Terminals:
Rating: 30VDC / 100mA
Max. wire cross section: 2,5mm²; strip length: 6mm
Protection to:
Permitted ambient temperature:
IP65
0 to +60°C
IRT... Sensing Coils
Available versions
Type code
IRT 25
IRT 40
IRT 50
IRT 60
IRT 75
IRT 100
IRT 150
IRT 200
IRT 250
IRT 300
D
25
40
50
60
75
100
150
200
250
300
A
90
100
100
120
135
150
210
260
310
380
B
97
106
112
120
135
153
210
260
310
380
Measurements (mm)
C
E
F
32
45
52
32
50
56
32
50
62
32
60
60
32
67,5
67,5
32
75
78
32
105
105
32
130
130
32
155
155
35
190
190
G
21
21
21
21
21
21
35
45
50
90
X
70
80
80
95,5
109,6
125
180
220
270
300
d
7
7
9,5
9,5
9,5
9,5
9,5
9,5
9,5
12
Other types on request.
Protection to:
Permitted ambient temperature:
IP65
0 to + 80°C
The product specifications are based on theoretical and experimental data, and we also have a policy of continuous
improvement in performance. Thus although we attempt to provide equipment which in all respects meets specifications,
this cannot be ensured in all cases without written confirmation from OPTRONIC AG.
499.023.19