DOLD GMBH Operating instructions DMP 96 A
DMP 96 A Version: 020 Number of pages: 26
H0e020bA4.doc Edition: 07.11.2006
8
Pt 100 three-wire lead: Automatic line resistance compensation via software
(maximum permissible line resistance: 50 Ω per lead)
Pt 100 two-wire lead: Line resistance correction (line compensation) of max. 9 Ω
possible via software (external bridge clamps 2-3),
Thermal converter: Calibration precision: ≤ 0.15% F.S.
Linearity error: ≤ 0.15% F.S.
Temperature drift characteristics
(without reference point compensation): ≤ 80 ppm/K
Effect of line resistance: ≤ 2µV/Ω
Reference point compensation
Error recognition using a controller reference point > 70°C
Sensor breakage cutoff
General: Measurement cycle: 1 s
Resolution: ≥ 12 bit
LRC and diode protection circuit for each input
Measuring-circuit
monitoring: Error shown on display
Protective circuits: Hardware watchdog and power-fail
Data backup: EE-PROM, semiconductor storage,
Hardware-protected calibrated values
2.1.2 Error-handling at input:
If the input signal leaves the maximum display range (for sensor ID) this is recognized as an er-
ror, evaluated, and shown on the display (error message "Er 1"). See section 4.4, page 11.
2.2 Digital inputs:
Logic input via potential-free contact, with configurable function
Contact:
Function:
Contact open Contact closed
Setpoint switchover Enter value for setpoint 1 Enter value for setpoint 2
Stop function - Control contact K 1 deactivated
Programming block Programming function block Programming function release
3. Control response:
3.1 Controller function:
Control response is configurable:
• Two-point response for heating or cooling, with adjustable hysteresis
• Two-point response for heating or cooling with PDPID – control characteristic and self-
optimization algorithm
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