Thermo Fisher Scientific Alpha RES 1000 - Manual (Page 8)

Operating Instructions Alpha RES 1000
1
1 Introduction
1.1 Description of Unit
Thank you for purchasing the Alpha ¼ DIN Alpha RES 1000 Resistivity process controllers. This unit is
used for measuring the Resistivity of a solution in mega-ohms. You can use this unit to measure Resistivity
with limit control. This controller has many user-friendly and safety features which include:
• Menu-driven program that simplifies set-up
• Two ranges of Resistivity measurements-software selectable (Section 7.5.3).
• Built-in memory backup to ensure that calibration data and other information are not erased if
power supply fails
• Automatic temperature compensation (ATC) with Pt100 or Pt 1000
• Manual temperature compensation with independent setting for calibration and process
temperature
• Temperature coefficient variable between 0.00 to 10.00 % per o C. Separate pure water compensation
curve stored in memory. Reference temperature at 25 o C.
• 0 to 1999 second time delay adjustment on all relays – minimise false alarms
• Separately adjustable high and low set point hysteresis (dead bands) prevent chattering of relays
around the set points.
Selectable Filter function stabilises rapid measurement changes.
• Three control modes: limit, proportional pulse length or proportional pulse frequency.
• Large dual display LCD for easy reading with clear multiple annunciators, alarm status and
operational message annunciators
• Two switching contacts as set-point triggering relays and an alarm output relay
• Separate alarm relay alerts you when set points have exceeded the limits and if the Pt100/Pt1000
wires are broken or disconnected during the ATC function
• Hold function freezes output current (0/4...20mA) and releases control relays
• LED indicators signal control activities to monitor controller status from a distance
• Protection against electromagnetic interference - galvanically isolated 0/4..20mA output provides
safety for data logging and control purposes
1.2 Applications
Use this controller in panel mounted enclosures for applications in Pure water and R.O. Systems.