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Van ’t Hoffstraat 12
2665 JL Bleiswijk, The Netherlands
T. 31 (0) 10 522 43 73
F. 31 (0) 10 521 19 41
E-mail: [email protected]
Website: www.tamson.com
VAT: NL 80 66 34 984 B01
Bank account no.: Rabobank 16 01 00 046
Chamber of commerce 27 16 95 41
IBAN Code: NL95 RABO 0160100046
Tamson Instruments bv
Rev. 2.1 UK 0517
9.5
Temperature not stable
- Restart system (option from menu, see menu item
"Restart" page 19 )
- Place top lid on the bath.
- Check PID settings. When PID settings are incorrect
the system can start to be unstable. Graph (SP-40
PID25-200-0) shows unstable control at -40°C due to a
high setting of I=200. Lowering this value to 20 results
into control of better than ±0.02°C
Standard PID setting:
Pb*=25
I=16
D=0
*Pb= proportional band. Proportional value P is found to
be 100/Pb)
-
System connected to RS232. PID settings “4” are
used. Change settings with Tamcom to Pb=25, I=16,
D=0.
- Check mains supply for stable power. Graph below
shows heavy disturbance due to fluctuations in mains
supply. Temperature accuracy is heavily disturbed by
voltage fluctuations due to switching on and off heavy
apparatus at mains supply. Previous graph(SP-40
PID=25-200-0) and graph below (SP-40 PID=25-20-0)
are same apparatus.