Balance Performance & Control Charting

Standard Gravimetric Performance Verification (UP/014, UP/015, UP/016) & Shewhart Trend Analysis

Interactive verification suite for analytical balances (Precisa, Sartorius MSE225S, Sartorius Cubis MSU6.6S microbalance, MT XP205DR). Evaluates daily drift, sensitivity errors (ΔE), repeatability standard deviations, and IQC recovery control charts with warning/action limits (2s / 3s).

Daily Performance Check (Borang UP/014)

Routine morning zero point, spirit level bubble, and single standard check

Select Balance Model

Standard Mass Value (g)

Spirit Level (Bubble) Centered?

Zero Point Reading (g)

Observed Reading (g)

Maximum Permissible Error (MPE) (mg)

Daily Verification Verdict

Deviation (ΔE = |M − m₀|): 0.0002 g (0.20 mg)

Allowed MPE Limit: ± 0.50 mg

Daily Accuracy Status: PASSED ✓

Sensitivity Check (Borang UP/015)

Multi-point standard mass test across operational range (Class E2/F1 standards)

Test Mass	Nominal Value (g)	Observed Reading (g)	Error (mg)
Point 1 (Low)			+0.10 mg
Point 2 (Mid)			-0.20 mg
Point 3 (High)			+0.30 mg
Point 4 (Max)			+0.40 mg

Sensitivity Evaluation

Max Absolute Error (ΔE_max): 0.40 mg

Permissible Threshold: ≤ 0.50 mg

Sensitivity Status: PASSED ✓

Repeatability Check (Borang UP/016)

10 consecutive weighings of reference mass (evaluates standard deviation s and 2s)

1. Reading (g)

2. Reading (g)

3. Reading (g)

4. Reading (g)

5. Reading (g)

6. Reading (g)

7. Reading (g)

8. Reading (g)

9. Reading (g)

10. Reading (g)

Repeatability Statistics (n = 10)

Mean Weight ($\bar{x}$): 100.00011 g

Std Deviation (s): 0.088 mg

Uncertainty Contribution (2s): 0.175 mg

Max Allowable ($s ≤ 0.15mg$): PASSED ✓

IQC Control Chart & Trend Analysis (PKKK/300/UP/064)

Shewhart accuracy control chart for Internal Quality Control samples with Warning (2s) & Action (3s) limits

Target Mean (100.0%)

Warning Limits ±2s (90% / 110%)

Action Limits ±3s (85% / 115%)

IQC Sample Recovery (%)