Labkotec Oy SET-TSHS2 Capacitive Level Sensors Level Switch Instruction Manual
- June 13, 2024
- Labkotec Oy
Table of Contents
Labkotec Oy SET-TSHS2 Capacitive Level Sensors Level Switch Instruction
Manual
SYMBOLS
Warning / Attention
Pay special attention to installations at explosive atmospheres
Fig. 1. SET/TSH2 and SET/TSHS2 dimensional drawings
GENERAL
SET/TSH2 and SET/TSHS2 are capacitive level detectors for liquids.
V-versions are utilized with conductive liquids to indicate either low or high
level, or for example oil/water interface in an oil separator. Oversions are
convenient for use with non conductive liquids, like oil, to indicate low or
high level.
SET/TSH2 is a generic sensor and it suits for most applications.
SET/TSHS2 is basically the same sensor with a fork as a counterelectrode.
It is meant for more challenging environments, e.g. grease, heavy oil or
clogging liquids. The sensors are apparatus of equipment group II, category 1
G and can be installed in Zone 0/1/2 hazardous area.
Fig. 2. Applications
CONNECTIONS AND INSTALLATION
The sensor is equipped with a shielded 3-wire cable. Wires 1 and 2 shall be connected to the corresponding connectors (1 = +, 2 = –) in the control unit. Wire 3 shall be connected to equipotential ground together with the shield of the cable.
Please refer also to the Installation and Operating Instructions of the control unit.
The sensor cable can be shortened or, when the control unit is located further away from the sensor, the cable can be extended with the junction box.
The sensor causes an alarm when its sensing element is half-immersed in the measureable liquid. The sensor can be installed by hanging it on its cable from a tank ceiling or it can be fixed in its place with an installation pipe equipped with a ¾” inside thread. The fixed mounting prevents movement of the sensor when there is flow in the tank.
When installing the sensor into an explosion hazardous area (0/1/2), the following standards need to be followed; IEC/EN 60079- 25 Electrical apparatus for potentially explosive atmospheres – Intrinsically safe electrical system “i”, IEC/EN 60079-14 Electrical apparatus for explosive gas atmospheres.
Fig. 3. Connection example
ADJUSTING THE SWITCHING POINT
- Immerse the sensor into the liquid to be measured so that the sensing element of SET/TSH(S)2-O/V sensor is half-immersed in the liquid (the teflon coated rod acts as the sensing element) as in fig. 4.
- Turn the sensitivity trimmer of the Labkotec SET control unit so that the alarm led just goes on.
- Check the function by lifting and immersing the sensor couple of times into the liquid.
Check also the Installation and Operating Instructions of the control unit in case of special instructions for the particular application.
Fig. 4. Adjusting the switching point
IF THE SENSOR DOES NOT WORK
If the sensor is located in a hazardous area an Exi-classified multimeter
must be used and the Ex-standards mentioned in chapter 5. SERVICE AND REPAIR
must be followed. Make sure that the Fault-led, which reports malfunction, is
not on. If the
Fault-led is on, repair any breakdown or short circuit in the electric
circuit.
You can also check the function of the sensor by measuring its supply voltage
(V) and current consumption (I) using a multimeter.
Measure voltage between control unit connectors + and -. The voltage should be
10.5…12 VDC.
Connect mA-gauge to the sensor circuit according to the figure below by
disconnecting wire no. 1 from the control unit.
Fig. 5. Measuring the sensor current
Sensor current in different conditions:
| TSH2- O| TSHS2- O
---|---|---
sensor clean and entirely air| 5…6,5 mA| 5…6,5 mA
sensor entirely immersed in oil| 9,,,12,5 mA| 9…12,5 mA
| TSH2- V| TSHS2- V
sensor clean and entirely air| 5…6 mA| 5…6 mA
sensor entirely immersed in water| 10…12 mA| 10,5…12,5 mA
SERVICE AND REPAIR
The sensor must always be cleaned up and tested when emptying the tank or
separator and when carrying out annual maintenance.
For cleaning, a mild detergent (e.g. washing-up liquid) and scrubbing brush
can be used.
Service, inspection and repair of Ex-apparatus needs to be done according to
standards EN IEC 60079-17 and EN IEC 60079-19.
TECHNICAL DATA
SET/TSH(S)2 sensor
Control unit| Labkotec SET control units
Cable| Shielded oil-proof instrumentation cable 3 x 0.5 mm2 Ø
5,1mm.Standard length 5 m. Other lengths optional.Max. cable loop resistance
75 Ω.
Temperature Operational Safety| ** -25 C…+60 C-25 C…+70 C
Materials| AISI 316, Teflon, NBR-concentrate
EMC Emission Immunity| ** EN IEC 61000-6-3EN IEC 61000-6-2
IP-classification Sensor Junction box| ** IP68 IP67
Ex-classification ****ATEX ****Special conditions (X)| II 1 G
Ex ia IIB T5 Ga VTT 03 ATEX 024XTa = -25 C…+70 CThe sensor cable can be
extended with the junction box type LJB3-78-83 or LJB2-78-83.
Ex-connection values| Ui = 18 V I = 66 mA Pi = 297 mWCi = 3 nF
Li = 30 µH
Operating principle| Capacitive
Manufacturing year: Please see the serial number on the type plate| xxx x
xxxxx xx YY** xwhere YY = manufacturing year (e.g. 19 = 2019)
EU DECLARATION OF CONFORMITY
We hereby declare that the product named below has been designed to comply with the relevant requirements of the referenced directives and standards.
Product
Level Sensor SEMSH2, SEVISHS2, SET/TSH2/VP
Manufacturer
Labkotec Oy Myllyhaantie 6 EI-33960 Plrkkala Finland
Directives
The product is In accordance with the following EU Directives: 2014/30/EU
Electromagnetic Compatibility Directive (EMC) 2014/30/EU Equipment for
Potentially Explosive Atmospheres Directive (ATEX) 2011/65/EU Restriction of
Hazardous Substances Directive (RoHS)
Signature
This declaration of conformity is issued under the sole responsibility of the
manufacturer. Signed for and on behalf of Labkotec Oy.
Pirkkala 4.8.2021
Janne Uusinoka, CEO Labkotec Oy
