Summary of Contents for AEC SM720
- Page 1 SM720 Operation Instructions Capacitive Level Transmitter WARRANTY YEARS Reg. No. 059-A www.alexsensors.com...
- Page 2 Alex Electronics Co. SM720 SM620 Capacitive Level Switches...
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Page 3: Table Of Contents
6.2 Rectify faults ..................................14 6.3 Exchanging the electronics module ...........................15 7 Disposal ..............................16 7.1 Dismounting steps ................................16 7.2 Disposal .....................................16 8 Supplement ............................17 8.1 Technical Data ...................................17 8.2 Dimensions ..................................18 8.3 Industrial property rights ..............................19 8.4 Trademark..................................19 SM720 Capacitive Level Transmitter... - Page 4 Safety instructions for Ex areas Take note of the Ex specific safety instructions for Ex applications(Group2 ). These instructions are attached as documents to each instrument with Ex approval and are part of the operating instructions manual. SM720 Capacitive Level Transmitter...
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Page 5: About This Document
• List: The dot set in front indicates a list with no implied sequence. Action: This arrow indicates a single action. Sequence of actions: Numbers set in front indicate successive steps in a procedure. SM720 Capacitive Level Transmitter... -
Page 6: For Your Safety
Arbitrary conversions or modifications are explicitly forbidden. The safety approval markings and safety tips on the device must also be observed. SM720 Capacitive Level Transmitter... -
Page 7: Safety Label On The Instrument
Accessories and replacement parts The protective cover protects the sensor housing against soiling and intense heat from solar radiation. Electronics module “UTS80” is a replacement part for ultrasonic sensors of UTS80. A different version is available for each model. SM720 Capacitive Level Transmitter... -
Page 8: About The Product
• Serial number Fig.1: SM720 Capacitive Level Transmitter Typical Application SM720 is suitable for use with liquids and solids. It is a very accurate measuring device and the most common measuring technique available. The sensor works with conductive and non-conductive liquids... - Page 9 ɛr >1 This change in the capacitance value is monitored by the electronic card (inside the head house) which converts it to equivalent 4 - 20 mA output signal. Fig.2: Theory of operation SM720 Capacitive Level Transmitter...
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Page 10: Installation
Alex Electronics Co. 3 Installation When installing the SM720 sensor please check that the fitting General Instructions and the sensor material is suitable for the product and the vessel. Install the sensor in a place that is easy to reach for connection and calibration steps. - Page 11 Keep the sensor away from the flow source to avoid getting false signals from the flow material instead of the product surface The following figure describes this in open flow channel and inside vessels. Good Good Fig.4: Installing with inflowing medium SM720 Capacitive Level Transmitter...
- Page 12 Alex Electronics Co. Installation in pipe When installing the SM720 in narrow pipes make sure that the pipe is connected to the earth and that there is a venting hole near its top to vent the air inside the pipe and allow the product to rise inside it.
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Page 13: Connecting To Power Supply
. 9 Earth terminal 10 Magnetic Pen Two-Wires connection card In case of the two wires system, connect the two power lines to the card as shown in previous figure taking into consideration the line polarity. SM720 Capacitive Level Transmitter... - Page 14 3. Pin 3 in the output terminal is connected to earth, use it when needed to connect external earth line to your system. 4. The calibration socket is for technical users only and not used by end users unless you have the calibration module. SM720 Capacitive Level Transmitter...
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Page 15: Calibration
LED2 starts to flash then release immediately. 7. The control card will read the capacitance and transmits 20 mA through the wires Fig.9: Calibration Step 5 SM720 Capacitive Level Transmitter... -
Page 16: Maintenance And Fault Rectification
The operator of the system is responsible for taking suitable occurs measures to rectifying faults. Causes of Malfunction SM720 offers maximum reliability. Nevertheless, faults can occur during operation. These may be caused by the one following: • Sensor • Process •... -
Page 17: Exchanging The Electronics Module
10. Insert the wire ends into the open terminals. 11. Check the hold of the wires in the terminals by gently pulling on them 12. Mount the probe into the vessel. Make sure that the probe is uncovered. SM720 Capacitive Level Transmitter... -
Page 18: Disposal
Correct disposal avoids negative effects on humans and the environment and ensures recycling of useful raw materials. Materials: see chapter “Technical data” If you have no way to dispose of the old instrument properly, please contact us concerning return and disposal. SM720 Capacitive Level Transmitter... -
Page 19: Supplement
Installation Flange: ≥2”, ≥DN40 Tri-clamp: ≥1”, ≥DN25 Intrinsic safety Protection Ex ib IIB (T1..T6) IP67 Length Up to 20m Electrical Data Supply 24Vdc Output Data 4-20mA Power consumption Less than 0.5W Protection applied Reverse polarity protection SM720 Capacitive Level Transmitter... -
Page 20: Dimensions
Alex Electronics Co. Dimensions SM720 WITH STANDAR PROBE SM720 WITH HIGH TEMP PROBE 100mm 80mm 15mm 30mm Wire Length Probe Length SM720 Capacitive Level Transmitter... -
Page 21: Industrial Property Rights
Alex Electronics Co. Industrial property rights AEC product lines are global protected by industrial property rights. Further information see http://alexsensors.com Trademark All the brands as well as trade and company names used are property of their lawful proprietor/ originator. SM720 Capacitive Level Transmitter... - Page 22 Alex Electronics Co. S e n s o r s H a v e S e n s e ALEX ELECTRONICS CO. K23 Alexandria - Cairo desert road Merghem Alexandria EGYPT Phone / Fax: (03) 342 5 991 Email: info@alexsensors.com Website: www.alexsensors.com SM620 Capacitive Level Switches...