(2) Connection with circulating constant temperature bath
WARNING
15
ە
ە
ە
ە
Pay careful attention to hot circulating water.
For connecting a circulating constant temperature bath with the refractometer, make
sure to use heat-resistant flexible tube which can stand at 150
Υ
or higher.
Moreover, tightly fasten each joint part between the nozzle and tube with the tube
band.
If the tube is damaged, replace it with new one as immediately as possible.
If the damaged tube is continuously used, the operator may scald himself with hot
circulating water.
The temperature of hot water to be supplied from a circulating constant
temperature bath to this refractometer is limited to 120
Υ
, and the flow rate of the
circulating constant temperature bath should be 10 L/min. at maximum through a
nozzle of 6mm caliber.
Too much discharge not only increases water pressure but also may cause
disconnection between the nozzle and tube or may overload the water channel
inside the refractometer.
Refractive indices of liquid matters vary depending on the temperature. Therefore, it is
strongly recommended to use a circulating constant temperature bath together with the Abbe
Refractometer for stable measurement at a constant measurement temperature as well as
for obtaining possibly correct results.
There are water circulating channels provided by the main and secondary prisms, and
constant temperature water is carried through tubes connected with the four nozzles shown
in Fig. 5-4. The following explains the method to connect the Abbe Refractometer with the
circulating constant temperature bath.
5. Preparation for measurement
Prepare three pieces of tubes (a, b, c) for
connection with a circulating constant
temperature bath as specified below.
Tube a and Tube c : 90cm long each
Tube b : 20cm long
a)
Connect the tube a and tube c to the
water outlet and inlet of the circulating
constant temperature bath, and fasten
them with tie bands.
b)
Connect the other end of the tube a
connected to the water outlet of the
circulating constant temperature bath to
the IN1 nozzle of the refractometer. Next,
connect the nozzles IN2 and OUT1 with
the tube b of 20cm long. Lastly, connect
the other end of the tube c connected to
the water inlet of the circulating constant
temperature bath to the nozzle OUT2.
Fasten every joint with a tie band.
c)
Note
: Use heat-resistant flexible tube which
can stand at 150
Υ
or higher and
whose outer diameter is 12 to 13 mm
and inner diameter is 6 to 7mm.
Tube a
Tube c
Tube b
To Circulating
constant
temperature
bath
From Circulating
constant
temperature bath
IN1
OUT2
IN2
OUT1
Fig. 5-4
