Hanna Instruments HI8931A, Инструкция по эксплуатации, Страница: 17 / 27

33 32
HI 8733 conductivity meter. E.g.
"
123.4
mS".
• The calibration is now complete and the
instrument is ready for use. All subse-
quent measurements will now be compen-
sated to 25°C (77°F).
• If the instrument will not calibrate refer to
the Probe Maintenance and Cleaning sec-
tion (see page 46).
• If the HI 8936 transmitter is not used in
conjunction with the HI 8931 controller, con-
nect the transmitter to an external power
supply (see page 19). Connect the trans-
mitter to the HI 7635 conductivity probe
(see page 23) and to an ammeter (see
page 19).
The calibration of the transmitters with LCD
(HI 8936AL, HI 8936BL , HI 8936CL,
HI 8936DL) does not require an ammeter.
Follow the above calibration procedure
performing the operations referred to the
HI 8936 transmitter only.
value obtained will be used for the trans-
mitter and controller calibration.
• The reading will be converted to mA by
the following formula:
mA = K (measured value x 16 ) + 4
2000
K = conversion factor depending on the model
Model Conversion factor K
HI 8936A & AL 10
HI 8936B & BL 100
HI8936C & CL 1
HI8936D & DL 10
For example, using a HI 8936A, if the mea-
sured value is 123.4 mS, then
output current = 10 x (123.4 x 16 )+4
2000
= 13.9 mA
Adjust the SLOPE
trimmer of the HI 8936
transmitter to read
"
13.9
mA" on the
ammeter or the read-
ing displayed by the
HI 8733 c o n d u c t i v i t y m e t e r o n t h e
HI 8936L display. E.g. "
123.4
mS".
• Adjust the SLOPE trimmer of the HI 8931
controller until the controller reading is the
same as the reading displayed by the