1) No temperature rise: After turning on the intelligent ash volatile tester, enter the main interface, press the "Furnace On" key, the status bar indicates heating, but the temperature does not change. Possible causes: the heating power switch is not closed; close the power switch. The porcelain fuse of the heating power supply inside the ash volatile tester controller is blown; open the controller, check for short circuits, eliminate them and replace the porcelain fuse. The thyristor inside the ash volatile tester controller is damaged; replace the thyristor. The heating power cable between the ash volatile tester controller and the high-temperature furnace is burnt due to oxidation or loosening at the connector; reconnect the cable properly. The terminal block inside the back cover of the high-temperature furnace is oxidized or loose, causing arcing and burning of the heating power cable inside the casing; open the back cover, replace the terminal block, and reconnect the heating power cable.Coal petrographic analysis
2) Press the "Power" key cannot start the ash volatile tester, no beep, no display: The power supply of the ash volatile tester controller is not connected properly; reconnect the power supply. The power fuse of the ash volatile tester controller is blown. Use a multimeter's resistance range to check for short circuits; if no short circuit, replace the fuse. The power supply voltage load capacity is poor: after starting the intelligent ash volatile tester for heating, the power supply voltage drops below 200V. Replace with a good power supply or use a voltage stabilizer; the grid voltage is low. Use a voltage stabilizer to stabilize to 220V. The muffle furnace chamber is damaged; replace the chamber. Silicon carbide rods are aging or damaged; replace the silicon carbide rods.
3) Slow heating rate: The power supply voltage may be low; use a stabilized power supply to meet the test requirements. The furnace wire may be aging; replace the furnace wire.
Drying oven
1) No temperature rise: The set working temperature of the instrument is not adjusted properly. If the set working temperature is lower than the ambient temperature, the device will not work; adjust the set working temperature correctly. The heating switch is not turned on; select and turn on the heating switch according to the required working temperature. The heating wire connection is loose or the heating wire is broken; tighten the heating wire connection nut if loose, replace the heating wire if broken. The relay (or contactor) contacts are poor; clean the contacts. The sensor is open circuit; connect the sensor circuit. The instrument is damaged; replace the instrument.
2) Excessive temperature fluctuation: The ambient temperature change is too large; improve environmental conditions to avoid large ambient temperature changes. The supply voltage change is too large; take voltage stabilization measures. The instrument control is sluggish; repair or replace the instrument.
3) Poor temperature uniformity: The blower motor does not rotate; eliminate faults in the blower motor electrical circuit. The test sample is loaded too densely; load the sample according to the instruction manual to ensure normal circulation of hot air in the working chamber. Hot air leakage; adjust the door seal strip height in the door slot to a suitable position. The air outlet is improperly adjusted; adjust according to the working temperature and sample density.
Sulfur analyzer
1) No temperature rise: The power supply of the sample feeding box is not connected properly; check and connect the power supply. The fuse is blown; replace the fuse. The silicon carbide tube is broken; replace the silicon carbide tube.
2) System heating too fast: The thermocouple is damaged; replace it. The heating thyristor is damaged; replace it. Use a multimeter to measure the voltage across the high-temperature furnace terminals to determine (normal voltage jumps between 110V and 220V).
3) Slow heating rate: The silicon carbide tube is aging; replace with a new one. The power supply voltage is low; use an external voltage stabilizer to stabilize the voltage.
4) Gas circuit system leakage: Pipeline leakage: the gas tube is broken or aged; replace and connect correctly. The connection is loose; tighten it. The smoke filter has poor sealing; check if the filter cover is tightened; check if the filter cover is equipped with a sealing ring; check if the sealing ring fits well with the cover and is not damaged. Electrolytic cell leakage: the sealing ring's sealing effect is poor; replace it. The sealing ring is dry; apply a small amount of Vaseline. The electrolytic cell cover is not tightened; tighten it. Leakage at the purification tube: check if the purification tube sealing rubber ring is damaged and replace it promptly. The purification tube is damaged; replace it.
5) Unstable gas flow or flow rate cannot reach 1000mldmin: Gas circuit system leakage; gas tube is kinked; the absorbent cotton in the smoke filter is clogged; replace it. There is discolored silica gel in the gas tube causing blockage; the electrolyte is ineffective; prepare new electrolyte.
6) Low measured results: Insufficient gas flow; adjust the gas flow meter to meet the requirements. Poor air tightness of the carrier gas system; leakage; check air tightness and eliminate the fault. The corundum tube is broken; replace it. The pyrolysis furnace temperature is insufficient; the sample is not fed in place. The carrier gas channel is blocked; clean it in time. The electrolyte is invalid (Ph<1); prepare new electrolyte.
Automatic calorimeter
1) Ignition failure: The oxygen bomb may not be filled with oxygen or insufficiently filled, or no sample is loaded; check the oxygen bomb and eliminate the above faults. The ignition wire may not be installed properly or the two terminals of the oxygen bomb for connecting the ignition wire are oxidized causing poor contact; wipe the oxide layer off the terminals with sandpaper and reconnect the ignition wire. The ignition wire may not contact the sample well. The stirrer may not stir or the stirring effect is poor; check the stirrer and remove debris inside it. The sample calorific value may be too low; add benzoic acid to the sample. The external power supply voltage may fluctuate greatly; add a voltage stabilizer. If none of the above faults, please contact the manufacturer for repair.
2) Oxygen bomb leakage: The connection parts of each component are not tightly sealed due to poor elasticity of the rubber ring or wear of components. Rubber rings will age and lose elasticity after long use; replace them when needed. In addition, some gas outlet connectors are tapered or elliptical; long-term use may cause wear and poor contact leading to leakage; in such cases, return to the manufacturer for repair.
3) Inaccurate measurement results: The balance for sample weighing is abnormal or inaccurate; the balance should be calibrated by a quality inspection department at least once a year; operate correctly during weighing to avoid inaccurate results. The heat capacity calibration is inaccurate. Use qualified benzoic acid; the inner cylinder water temperature during heat capacity calibration should be consistent with the inner cylinder water temperature during calorific value measurement. Insufficient oxygen filling or the oxygen does not meet requirements; fill sufficient oxygen as required or replace with oxygen that meets experimental requirements. The stirrer is faulty or the stirring speed is uneven; check if the stirrer wiring is loose and if the stirring paddle is properly positioned. When using a Beckmann thermometer, the capillary bore and average division value correction is not performed or incorrect; perform the correction. The water volume in the inner cylinder cannot be kept consistent.
