Introduction of HC-1S Mortar Air Content Tester: A new generation of experimental instrument developed for measuring the air content in mortar, suitable for mortars with an air content not exceeding 10%. Technical parameters of the mortar air content tester: 1. Bowl volume: 1 liter 2. Air content range: ≤10% 3. Power supply: DC6V (4 AA batteries) 4. Weight: 6kg
Calibration of the instrument during air content measurement:
Each instrument is precisely calibrated before leaving the factory and comes with calibration results, but periodic recalibration is recommended to ensure the accuracy of the air content measurement of the concrete mixture. The calibration includes the following three steps: 1. Calibration of bowl volume a. Prepare a flat glass plate and weigh it together with the empty measuring bowl to obtain weight W2 (accurate to 0.05kg); b. Fill the container with water, and slide the glass plate along the upper edge, occasionally adding water with a syringe to ensure the measuring bowl is filled with water and that there are no air bubbles under the glass plate. Then weigh the full measuring bowl with the glass plate to obtain weight W1 (accurate to 0.05kg), thus the volume V of the measuring bowl: W=W1-W2 (W, W1, W2 - kg) V=W1-W2 (W, W1, W2 - kg) V=W/r (V-L) r - specific gravity of water at calibration temperature (r - kg/L) 2. Calibration of 0% air content. a. Fill the measuring bowl with water and connect calibration tube 2 to the small faucet under the bowl cap. b. Open the small faucet, gently place the bowl cap on the measuring bowl, tighten with a clamp, and check the level of the instrument with a level. c. Open the air release valve, use a syringe to add water from the small faucet until water bubbles out of the air release valve, then close the small faucet and the air release valve.
Note: The space under the bowl cap must be completely filled with water; otherwise, the reading will not reflect the correct air content value. d. Use a pump to pressurize, slightly exceeding 0.1MPA, wait for 5 seconds, then adjust with the fine-tuning valve to keep the gauge pressure precisely at 0.1MPA, lightly tap the dial, and ensure the gauge pressure remains at 0.1MPA, then press the valve stem 2-3 times to balance the pressure in the air chamber with the pressure in the measuring bowl, reading the gauge value which corresponds to an air content of 0% 3. Calibration of the scale for air content from 1%-10%
