eutech-instruments ammonium epoxy User Manual

Instruction Manual 

 

Ammonium Electrode 

 

13

TROUBLESHOOTING HINTS 
 
Symptom 

Possible Causes 

Next Step 

Out of Range 

defective meter 

check meter with Reading   

  

shorting 

strap 

 

 

(see meter instruction manual)   

                                      
 electrode(s) 

unplug 

electrode(s) 

 

not plugged in 

and reset 

 properly   
 
 

reference electrode 

be sure reference  

 

not filled  

electrode is filled 

 
 

air bubbles on  

remove bubble by 

 membrane 

redipping 

electrode 

 
 

electrodes not 

put electrode(s) 

 

in solution  

in solution     

 
 
"Incorrect  

incorrect scaling 

plot millivolts on the linear 

Answer" 

of semi-log paper 

axis. On the log axis, be sure 

curve is good) 

 

concentration numbers within 

 

(but calibration 

 

each decade are increasing 

 

 

 with increasing concentration 

 
 

incorrect sign 

be sure to note  

 

 

sign of millivolt number correctly 

 
 

incorrect standards 

prepare fresh standards 

 

 

 

wrong units used 

apply correct conversion factor:  

  

10-

3

M = 18 ppm NH

4

+ = 

 

 

14 ppm as N 

 
 

sample carryover 

rinse electrodes  

 

 

 

 

thoroughly between samples 

 
 
Drift (reading 

samples and standards 

allow solutions 

slowly changing 

at different  

to come to room 

in one direction) 

temperatures 

temperature  

  

before 

measurement 

 
 

electrode exposed 

soak electrode  

 

to interference 

in ammonium standard 

 
 

incorrect reference 

use recommended 

 

filling solution 

filling solution