Tamson Instruments bv, van 't Hoffstraat 12, 2665 JL Bleiswijk, Netherlands
.
+31(0)10 – 522 43 73 Fax. +31(0)10 – 521 19 41
\\word\manuals\tlv25\\mantlv25.doc Date 09-2010 Rev. 1.31 UK
pag. 7 / 26
Cooling TLV25 with KV40 and KV80
[Ref
TLV25_15.XLS]
-70.000
-60.000
-50.000
-40.000
-30.000
-20.000
-10.000
0
10.000
20.000
30.000
0
:0
0
0
:3
0
1
:0
0
1
:2
5
2
:0
0
2
:3
0
3
:0
0
3
:3
0
4
:0
0
4
:3
0
5
:0
0
5
:3
0
6
:0
0
6
:3
0
7
:0
0
7
:3
0
8
:0
0
Time [hrs]
T
e
m
p
°
C
KV80
KV40
The TLV25, general
The Tamson model TLV25, low temperature viscometer bath is designed to perform a variety of accurate
temperature controls for e.g. low temperature viscosity measurements.
The TLV25 system contains a 25 liter Dewar flask. The fluid in the flask must permanently be cooled by an
external cryostat. The temperature set point is maintained via a microprocessor controlled heating element.
Depending on the type of cryostat used, minimum end temperatures of minus 30
°
, -60
°
C or -80
°
C can be
reached. Temperatures are measured in 25 liters of Methanol with the KV40 and KV80 cryostats. At these
minimum temperatures still enough energy is provided to maintain stable temperature when glas work is
placed in the bath. The system accuracy conforms to ASTM D445 and ISO 3103 description. The bath is
inside illuminated by a fluorescent light build-in behind the Dewar flask.
The cryostat is a separate apparatus and must have enough capacity to cool 25 ltrs of liquid. It is further
important that the cooling power supplied by the cryostat is very stable. It is for these reasons that we
strongly recommend a combination of the TLV25 with the KV40 or KV80.
Span
Depending on the used cryostat:
-
Minus 30
°
C with KV40
-
Minus 60
°
C with KV80
-
Minus 80
°
C with KV80S
-
Lower temperatures on request
Accuracy
The set point can be set in steps of 0,1
°
C
from - 90
°
C up to plus 70
°
C. Overall
system accuracy is better than
±
0,04
°
C.
Read-out is on a 4 digit, 7 segment LED
display in 0.1
°
C. On request read-oud
also is available in
°
F.
Safety thermostat
To prevent problems caused by a
malfunctioning of the heating element the
bath is equiped with a safety thermostat.
This thermostat can not be adjusted, and
has a fixed preset value of 125
°
C. When for
any reason the temperature of the bath will raise to this limit
