Saia-Burgess
Controls Ltd.
Hardware Manual for the PCD3 Series│Document 26/789; Version E 5│31.01.2005
Hardware
PCD3.W2x0
5-42
5
T[°C]=
- 261,8
DV
2.08 - (0.509 • 10-³ • DV)
T[°C]=
- 261,8
562
2.08 - (0.509 • 10-³ • 562)
=51,5°C
Formulae for temperature measurement with Pt 1000
In the temperature range – 50° to + 200°C the following formula can be used for
working to an accuracy of ± 1 % (± 1.5°C). Repeating accuracy is significantly higher.
T = temperature in °C
DV=digital value (0...1023)
Example 1 : digital value DV = 562
temperature T in °C ?
DV = digital value (0 ..1023)
T=temperature in °C
Example 2 : preset temperature T = –10°C
appropriate digital value DV ?
Resistance measurement up to 2.5 kΩ
Special temperature sensors or any other resistances up to 2.5 kΩ can be connected
to the PCD3.W220. The digital value can be calculated as follows:
where 0 ≤ DV ≤ 1023 and R=the resistance to measure in Ω.
DV=
2.08 • (261.8 + T)
1 + (0.509 • 10-³ • (261.8 + T))
DV=
2.08 • (261.8 - 10)
1 + (0.509 • 10-³ • (261.8 - 10))
=464
DV=
10 • R • 1023
(7500 + R) • 2.5
