Rs232 Interface; Troubleshooting - Peqlab HX-1 Bedienungsanleitung

Instruction Manual HX-1 & HX-2
sensor into your sample. Make sure there is a good fit between the thermometer and the block or good
contact between any sensor and sample or sensor and block.
1. Press and hold the Start – Stop key, then simultaneously power up the unit with the ON/OFF switch.
2. You should hear an acoustic signal sound from the block heater and the display will have one seg-
ment flashing on the left and will show a set temperature.
3. Use the arrow keys to set the desired temperature at which you want to calibrate the unit. Then press
the Start key.
4. Allow time (up to 40 or 50 minutes) for the unit to heat up to your set temperature and to equilibrate
at this temperature. The entire LED display will start flashing when equilibration is reached.
5. After the entire display has started flashing, read the thermometer (or sensor meter) and use the ar-
row keys to adjust the display to the thermometer or sensor reading. Then press the Stop key.
6. The unit will then begin to automatically adjust its operating temperature to your original set point
with the re-calibration factor included. Allow sufficient time for the unit to re-equilibrate and then
again compare the thermometer or sensor reading to the calibrated display. They should closely
match. If not, repeat the calibration procedure.
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Thermometers used for calibration purposes should have a written calibration certificate and be traceable back to NIST (Na-
tional Institute of Standards and Technologie) or some other certified body. General lab thermometers are often not accurate
enough for calibration work.

8. RS232 INTERFACE

The Digital Block Heaters have an RS232 unidirectional data port. Optional software disk and interface
cable are available which allow a user to use a desk top or lap top computer to record and/or print the
temperature profile produced by the Digital Block Heater.

9. TROUBLESHOOTING

Display/LEDs do not light up: 1. Check power cord & outlet.
Unit not heating:
Unit displays temperature overshoot:
Block or sample temperature does not agree with the temperature indicated in the display:
PEQLAB_v0312_E
2. Check ON/OFF power switch at the back of the unit.
3. Check fuse.
4. Call service.
1. Assure that set point is not below room temperature.
2. Check if Start LED is illuminated.
3. Press Start key.
4. Call service.
1. Normal operation! Display set point in heat-up overshoots on initial
heat-up but block and sample do not overshoot. See section 6
'OPERATION'.
1. Assure that the unit is in heating mode.
2. Avoid the unit sitting in draft.
3. Check accuracy of thermometer.
4. Assure that the thermometer is making good contact to the block
and the sample.
5. Follow calibration procedure.
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