Cell resistance meter

【System Parameters：

Composition: Measuring instruments, STX01 Electrodes, STX04 Calibration system electrodes, chargers

Membrane voltage range: ± 999.0 mV

Voltage measurement: 0.1 mV

Resistance range: 0 to 10,000 Ω

Resistance resolution: 1 Ω

AC square wave current: ± 10 μA nominal at 12.5 Hz

Power Supply: built-in 6 V NiMH 2,200 mAH Battery, external connection 12 VDC Power supply for charging

Every charge 12h Battery availability time: 8–10 hrs

Analog output: 1–10 V (1 mV/ohm)

Environmental requirements: 50– 100 °F (10– 38 °C )

0–90% non-condensing relative humidity

Size: 19 × 11 ×6 cm

Weight: 1.4 kg

【Brief operation instructions】

Attention: Do not use the instrument for measurement while charging! Disconnect the charging power before all operations.

1. Calibration resistance meter

STX04 Insert the electrode into the instrument, turn on the power, set the mode to Ohm mode, and if the instrument displays 1000Ω For normal operation, no adjustment is required, not with a screwdriver RAdj Make the instrument reading 1000Ω.

The mode is set to millivolt range, and the instrument reading is 0.

2. Equilibrium electrode

When measuring voltage, it is necessary to balance the electrodes first.

STX01 Insert the electrode into the instrument, turn off the power, set the mode to Ohm mode, and use PBS,0.15MNaCl perhaps 0.1MKCl The solution undergoes equilibrium, and there are different equilibrium times for different storage methods.

3. Electrode calibration / Electrode functional testing

The electrode needs to be calibrated before use or after dry storage, and the electrode should be balanced before calibration.

STX01 Electrode insertion instrument, mode set to Ohm mode, electrode immersed in electrolyte solution similar to culture medium or 0.1M －0.15MNaCl perhaps KCl In the solution, turn on the power and the instrument displays 0.

4. Resistance or voltage measurement

a)Electrode sterilization:

Electrode immersion 70 %In ethanol 15min, Cannot exceed 30min Dry in the air 15S .

Rinse the electrode with sterilized electrolyte solution.

If used for resistance measurement, this electrode does not need to be balanced. If used for voltage measurement, it needs to be rebalanced 15min .

b)Resistance measurement:

Set the mode to Ohm mode and turn on the power. support STX01 Electrode insertion to be measured Millicell Insert The long electrode is on the outside, the short electrode is on the inside, and the electrode needs to be perpendicular to the culture dish. Measure the corresponding sample hole resistance and blank hole resistance. If unit area resistance is required, calculate according to the following formula: R (Unit area)= R× Effective membrane area.

c)Resistance measurement:

Set the mode to millivolts and turn on the power. support STX01 Electrode insertion to be measured Millicell Insert The long electrode is on the outside, the short electrode is on the inside, and the electrode needs to be perpendicular to the culture dish. reading.