Thermo Fisher Scientific Alpha RES 1000 - Manual (Page 15)

Operating Instructions Alpha RES 1000
8
5 Measurement
5.1 Display in Measurement mode
When controller is powered on, it automatically enters into the Measurement mode after large dual LCD briefly
displays all segments.
The upper display shows the measured Resistivity value, while lower display shows temperature value.
Annunciators at right side of the display indicate m
Ω and o C. Similarly annunciators or icons at the top or left
side of the display shows current status of controller, e.g. “HOLD”, “SETUP”, “MEAS”, “CAL”, “READY”, etc.
5.1.1 Check electrode performance
To read current electrode condition without changing them:
1) Press the CAL key followed by the ENTER key without adjusting the security code (leave code at “000”).
The upper display shows the last cell constant as a percentage with the lower display shows “CEL”. Press
ENTER key and the next upper display shows the last calibration factor.
Note: If security code is changed to a value other than “000”, pressing ENTER key will return to
Measurement mode, without displaying electrode information.
2) Press ENTER key a second time to return to Measurement mode.
5.1.2 Checking set points
To read current set point values without changing them:
Press RELAY Selection (Rel A / Rel B) key. Upper display shows set point for Relay A; lower display shows
“SP1”.
After two seconds upper display shows set-point value for Relay B; lower display shows “SP2”.
After an additional two seconds, controller returns to Measurement mode.
5.2
Security Codes
Two levels of security protection with separate security codes are provided. First level allows entry into the
Calibration mode: security code = 11; second allows entry into SETUP mode: security code = 22.
Security codes protect controller from unauthorised tampering. Parameters cannot be changed unless the
security code is entered.
5.2.1 How to enter and change parameters in Calibration mode
1) Press CAL key. Upper display shows “000” and lower display
shows “C.Cd” to prompt for Calibration security code. 1 1
C.Cd
2) Press Δ or ∇ keys to scroll upper display to Calibration security
code “11”.
3) Press ENTER key. Display shows “CAL RES”.
4) Press ENTER again to begin calibration. Refer to Section 6 for full details on calibration.
5) Press
Δ and ∇ keys simultaneously (escape) to return to Measurement mode.
NOTE: To view (not change) electrode condition, push ENTER key when the security code reads “000”.