Metrohm 767 Calibrated Reference User Manual download pdf (Page 11)

3 Procedure for checking instruments

767 Calibrated Reference Instructions for Use 7

3.2.1 U/mV, pH

carry out on instrument or sen-

sor:

carry out on Calibrated

Reference:

compare display

with:

remarks

1. screw off cable at sensor (for plug-in

head electrodes, otherwise use

corresponding accessory cable, see

chap. 5.2

close cover place sensor in

storage tube

2. connect sensor cable to

socket (5)

3. measure mV mV value (5)

4. open cover mV value (5) compare with

permitted toler-

ance; note value

5. connect sensor cable to

socket (4)

permitted variation

from value noted

under step 4:

±0.1 mV (short-

time larger devia-

tions are normal)

6. connect sensor cable to

socket (6)

mV value (6) observe polarity;

(switch measuring

range if required);

compare with

permitted tolerance

7. measure pH close cover pH value (6) set U

to pH 7 if

necessary

8. open cover pH value (6) compare with

permitted tolerance

End of check

Steps 9...12 are of secondary importance. In general it is sufficient to carry out this check once per year.

For instruments with earthed circuits (e.g. all Titrinos and early series of 692/713) or for instruments without an earth socket (604,

704, 744) these steps are not relevant. Further Information to steps 9...12 can be found in chapter 2.5.

9. measure mV connect sensor cable to

socket (5)

note display as

under step 4

10. additionally connect cable

6.2150.020 (from accesso-

ries in case) to socket (6)

11. insert banana plug of cable in step

10 in earth socket of tested instru-

ment. Banana plug of shielding re-

mains open.

do not touch sockets (4),

(5), (6) during the meas-

urement

observe display

while connecting

the cable

permitted variation:

±0.1 mV display as

under step 5

(short-time larger

deviations are

normal)

12. remove cable from step 11 remove cable from

socket (6)

If the variation of the measured values is too large then first exchange

the original sensor cable against the reference cable in the accessories.

When the check is finished recalibrate the electrodes.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 22 23

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