C.B.S. Scientific DGGEK-2401 - Manual (Page 13)

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2 3 6 Controller Calibrations and Maintenance
2. 3.6.a Calibration
Calibration allows the user to match the Controller’s bath temperature display to an external
reference thermometer. Calibration is performed as follows: Set the desired operating fluid tem-
perature set point and allow temperature to stabilize. Press the P2 and P3 simultaneously and
release and repeat until the display reads (oCx.x). Press P1 and hold until (Cal) is displayed. This
will take about 2 seconds. At one second intervals, the displayed value will alternate between
the actual bath fluid temperature and the current offset value, which is the difference between
the factory calibration setting and the user’s reference temperature sensor. The maximum offset
is ±0.9°C from factory calibration. To change the calibration offset value, rotate the Select/Set
Knob until the display matches the reading on the reference temperature sensor. The display
will continue to alternate between the offset value and the calibrated display temperature. Press
the Select/Set Knob or the P1 Button to accept the entered value. When the new calibration is
stored and the mode is exited, (dONE) will appear on the display. NOTE: The displayed offset
value will also be accepted if there no activity for 20 seconds. 6.2 Heater The heater should be
kept clean. If deposits build up on the heater, they may be removed by scrubbing with a non-
metallic (plastic) abrasive pad. Do not use steel wool.
2.3.6.b Pump Motor
The pump bearings are permanently lubricated with high-temperature silicone grease and do not
require additional lubrication. Should the bearings become noisy, replacement of the entire pump
motor is recommended. This will reduce repair labor costs and retain fluid pumping reliability. A
replacement pump and motor mounting kit is available (see Section 10 - Replacement Parts). 6.4
Cleaning Only mild detergents and water or an approved cleaner should be used on the painted
and stainless steel surfaces of the Circulator. Do not allow cleaning liquids or sprays to enter the
Controller vents. A concentrated bath cleaner is available that can be used to remove mineral
deposits from the reservoir. See Section 10 - Replacement Parts.
2 3 7 Controller Reservoir Fluids
For your buffers use distilled or RO water only!
DO NOT USE the following fluids:
1. Automotive antifreeze with additives**
2. Hard tap water**
3. Deionized water with a specific resistance > 1 meg ohm
4. Any flammable fluids
5. Concentrations of acids or bases
6. Solutions with halides: chlorides, fluorides, bromides, iodides or sulfur
7. Bleach (Sodium Hypochlorite)
8. Solutions with chromates or chromium salts
9. Glycerine
10. Syltherm fluids
** At temperatures above 40°C, additives or mineral deposits can adhere to the heater. If
deposits are allowed to build up, the heater may overheat and fail. Higher temperatures
and higher concentrations of additives will hasten deposit build up
Warning: Do not use a flammable liquid as a bath medium as a fire hazard
may result.