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We are taking ultimate care in supplying you our precision Load Cells for long term trouble free services. We expect Load Cells to perform well, provided they are handled carefully, applied to the system properly and used within the specified limits.
In order to induce some training to your shop floor technicians, we present you few tips for Handling and Trouble Shooting Load Cells. We hope this will be useful to you. |
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| Handling |
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Always keep the Load Cells which you receive in a safe place carefully in the same packing condition, i.e. packed in a thermocol box or wrapped in bubble plastic foil. Avoid to pile up the Load Cells one above another to avoid any injury to the sensitive gauge area. Select the dry and cool storage place for the Load Cells. |
| 2. |
Do not carry the Load Cell hanged through the cable. Also avoid any sharp bending of cable at the Load Cell end. Or it will brack the copper conductor and damage the delicate solder joints inside the cavity. |
| 3. |
Always avoid to touch and handle the Load Cells through the delicate part of gauges which are under the flexible white RTV coating areas. |
| 4. |
Always install the Load Cells properly into your application area. Avoid any overloading of the Load Cells during your installation stage. Provice your all Load Cells with mechanical over load protection mechanism. You also provide addditional protection to the Load Cells from loquid falling over it, to increase its useful life. Always choose the Load Cell at least 1.5 to 2 times over rated capacity with suitable model for the required application.
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We are sure, if you follow above points carefully, you will have no complaint about our Load Cells. However, if you have any problem, please follow the given below steps to check Load Cell...... |
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Trouble Shooting
Trouble Shooting starts with careful inspection procedure reviewing all cable, Load Cell body, Strain Gauge, Protecting Coating or Cover condition etc.. All these parts should retain their original physical integrity. No part should be tampered with to obtain service under Guarantee from us.
If you confirm that there is no problem with either mounting hardware or cabling or electronics, following tests have to be performed by you, before you ship the Load Cell to us for repairs. |
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| Test 1-Zero Balance |
Load Cells are shipped with their zero Balance output at + 5% of the output. For2 mV/V output , Zero would be + 0.1 mV.V (+ 1 mV if excitation voltage applied is 10 V) Zero balance Shift is usually due to overloading effects on the Load Cell installed into your system. This Shift will be upto 100% (+20 mV if excitation voltage applied is 10 V) and still Load Cell is working, depending upon the type of overloading effects and type of Load Cell.
In this case you may bring down the Zero balance close to zero by inserting a suitable value of metal film resistor between -ve output (signal -ve) and -ve excitation if zero is shifted in -ve side and resistance between -ve output and +ve excitation, if zero is shifted in +ve direction. In 350 ohms Load Cell, value of 43.5k resistance will shift output by 2mV/V, 87.5k will shift output bye 1mV/V and 3.5 Meg ohms will shift output by 0.5 mV/V. With this arrangement into your PCB, if you are getting your desired results into your system from the Load Cell, it means that Load Cell is functioning properly. If the Load Cell does not behave properly after the above arrangements, it means the Load Cell is damaged. You may have to send the Load Cell back to us for further inspection. The Load Cell may not be repairable if the Load Cell body has been over Loaded i.e. it has been stressed beyond its elastic limit. OTHERWISE LOAD CELL WILL BE REPAIRABLE.
While sending back, give us your full feedback like your observations, under which condition it misbehaved, its output reading, input/output resistance etc. Always send Load Cell back for repair in original packing only. No Load Cell will be repaired by us if it is not sent back properly packed. |
| Test 2- Bridge Resistance |
Change in bridge resistance is caused bye failure of the temp. compensation element, failure of shunting resistor, broken bridge wire, broken cable solder joint. Input resistance is usually 380 to 415 ohms in Single Ended, "S" Beam and Single Point Offcentre Load Cells, it is 450 ohms in Canister and 760 ohms in Double Ended Shear Beam Load Cells.
Out Put resistance is 350 ohms or 700 ohms (Double Ended) or 480 ohms (Canister).
In such damages, you may ship the Load Cell for repair with your detailed observation, packed in original condition only. |
| Test 3 - Resistance To Ground (Body) |
Electrical leakage is due to water contamination within the Load Cell or due to the insulation damage inside the Load Cell due to electrical surges, lightning or welding current. Insulation between the body and the Junction of four wire joined together should be 1000 M ohms at 50 VDC. If it does not meet this condition, you have to send the Load Cell for repair to us properly packed with your detailed observations. |
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| Tips For Sending Back The Load Cell For Repair |
| 1. |
Always pack the Load Cell in original packing only. |
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Please send Load Cells with your delivery challan. Declare in challan that it is sent for repair and not for sale. |
| 3. |
Invariably give your detailed report, on the Load Cell sent for repair. Be as detailed as Possible in the description of the failure of the Load Cell. This will help us to speed up the repairing work. |
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We are sure, if you follow above points carefully, you will have no complaint about our Load Cells. However, if you have any problem, please follow the given below steps to check Load Cell...... |
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| WE STRONGLY RECOMMEND NOT TO ALTER ANY PART OF THE LOAD CELL, WHICH IS NOT FUNCTIONING PROPERLY. IT IS ONLY TO BE REPAIRED AT OUR FACTORY. |
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