background image

V1.0

 

 

V1.0 

INTRODUCTION 

 

Where damage to a sensor or cable is suspected this guide illustrates the way in which simple 

resistance checks can be taken to identify the possible cause of the problem. 

 

Resistance checks can be made with most types of multi-meter which are readily available in the 

market. 

RESISTANCE OF THE COILS 

 

STEP 1 

Set the range to 200Ω or Ω if using a multi-meter which has automatic ranging. 

 

STEP 2  

Connect the VW+ (red) conductor to the red lead on the multi-meter and the  

VW- (black) to the black lead on the multi-meter. 

 

The correct readings should be as follows ±10%  

 

Pressure Transducer ~ 160Ω 

 

Strain gauge 

 

~ 180Ω 

 

Co-axial coil 

 

~ 50Ω 

 

IF THE VALUES ARE OUT OF THESE RANGES THEN THERE IS A FAULT IN THE COILS 

 

IF THE VALUES ARE 50% THEN THERE IS A PROBLEM WITH ONE OF THE COILS 

 

Summary of Contents for 5XP-A

Page 1: ...V1 0 V1 0 QUICK GUIDE Resistance diagnostics for troubleshooting vibrating wire sensors and cables ...

Page 2: ...the market RESISTANCE OF THE COILS STEP 1 Set the range to 200Ω or Ω if using a multi meter which has automatic ranging STEP 2 Connect the VW red conductor to the red lead on the multi meter and the VW black to the black lead on the multi meter The correct readings should be as follows 10 Pressure Transducer 160Ω Strain gauge 180Ω Co axial coil 50Ω IF THE VALUES ARE OUT OF THESE RANGES THEN THERE ...

Page 3: ... to the red lead on the multi meter and the T white to the black lead on the multi meter The readings will be dependent on the temperature as below 10 C 5 971kΩ 5971Ω 15 C 4 714kΩ 4714Ω 20 C 3 478kΩ 3478Ω 25 C 3 000kΩ 3000Ω PLEASE REFER TO THE THERMISTOR LOOK UP TABLE ON PAGE 4 IF THESE VALUES DIFFER THEN THERE IS A PROBLEM WITH THE THERMISTOR OR IT S CONDUCTORS ...

Page 4: ... 7 1212 47 301 7 87 97 3 127 60 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K 29 5692 11 1040 51 266 6 91 87 9 131 46 94K 28 5427 12 1002 52 258 6 92 85 7 132 44 16K 27 5177 13 965 0 53 250 9 93 83 6 133 41 56K 26 4939 14 929 6 54 243 4 94 81 6 134 39 13K 25 4714 15 895 8 55 236 2 95 79 6 135 36 86K 24 4500 16 ...

Page 5: ...ll pairs of conductors should be checked by connecting to the red and black leads on the multi meter as follows Red black Green white A value of O L open loop means that there is a high infinite resistance and therefore it is likely that the cable has been cut If one of the above pairs is OK then check the individual conductors against the earth ...

Page 6: ...6 ...

Reviews: