ETENWOLF S5 Tire Inflator Inflation Accuracy Test Report — Ball Mode (Soccer Ball, PSI Precision)

Document Overview

Key Findings All 11 test cases across both sample units of the ETENWOLF Zephyr S5 tire inflator demonstrated consistent inflation accuracy in Ball Mode, with stop pressure deviations ranging from −0.1 to −0.7 PSI below the preset target — remaining within acceptable precision tolerance across…

Document type

Test Report

Prepared by

Daniel Wright

Published

July 22, 2026

Last reviewed

July 22, 2026

Topics

Motor Performance

Key Findings

All 11 test cases across both sample units of the ETENWOLF Zephyr S5 tire inflator demonstrated consistent inflation accuracy in Ball Mode, with stop pressure deviations ranging from −0.1 to −0.7 PSI below the preset target — remaining within acceptable precision tolerance across all soccer ball pressure ranges.

• Product: ETENWOLF Zephyr S5 Tire Inflator
• Test Mode: Ball Mode (球模式) — Soccer Ball (足球)
• Test Date: 2024-10-17
• Samples Tested: 2 units (Unit 1# and Unit 2#)
• Total Test Cases per Unit: 11
• Pressure Range Tested: 0–8 PSI (various sub-ranges)
• Maximum Deviation Observed: −0.7 PSI (at 0–3 PSI range, preset 3.0 PSI)
• Minimum Deviation Observed: −0.1 PSI (at 0–6 PSI range, preset 6.0 PSI, Unit 1# only)
• All deviations are negative (stop pressure consistently below preset), indicating conservative cutoff behavior
• Overall Verdict: Pass — inflation accuracy meets Ball Mode performance requirements

Test Overview

Test Equipment & Setup

Test Procedure

1. Pre-Test: Confirm the S5 unit is fully charged and in operational condition. Verify the ball (soccer ball) is deflated to below the lower bound of the target range before each inflation cycle.
2. Mode Selection: Power on the S5 inflator and navigate to Ball Mode (球模式). Select the Soccer Ball (足球) sub-type.
3. Preset Configuration: The device automatically assigns a preset target pressure based on the selected ball mode and pressure range. Record the preset pressure (打气预设气压) before initiating inflation.
4. Inflation: Connect the appropriate nozzle adapter to the ball valve. Initiate inflation. The device inflates from the current ball pressure (lower bound of the stated range) toward the preset target.
5. Automatic Cutoff: The device stops inflation automatically when its internal sensor detects the target pressure has been reached. Record the actual stop pressure (停止气压) displayed or measured at cutoff.
6. Deviation Calculation: Calculate the deviation (差值/精度) as: Stop Pressure − Preset Pressure. A negative value indicates the device stopped below the preset target.
7. Repeat: Perform all 11 pressure range cases for Unit 1#, then repeat the full sequence for Unit 2#.
8. Post-Test: Record all results. Compare deviations against the acceptance criterion.
9. Acceptance Criterion: All stop pressure deviations must fall within the specified Ball Mode accuracy tolerance band. No single deviation may exceed the maximum allowable error for ball inflation mode.

Test Data & Results

Unit 1# — Sample Serial: S5 Unit 1#

Unit 2# — Sample Serial: S5 Unit 2#

Observations: All deviations across both units are negative, indicating the S5 consistently stops inflation slightly below the preset target pressure — a conservative cutoff behavior that prevents over-inflation. The largest deviation recorded was −0.70 PSI (Test Case 4, 0–3 PSI range, both units). The smallest deviation was −0.10 PSI (Unit 1#, Test Case 9, 0–6 PSI range). Unit 2# shows slightly more uniform deviation distribution compared to Unit 1#, with most values at −0.40 PSI. No over-inflation (positive deviation) was observed in any test case.

Conclusion

Document Information

Frequently Asked Questions

How accurate is the ETENWOLF S5 in Ball Mode for soccer balls?

Across 22 test cases (11 per unit, 2 units tested), the S5 stopped inflation between −0.10 and −0.70 PSI below the preset target. The device consistently undercuts the preset slightly — preventing over-inflation — while staying within the Ball Mode accuracy specification. No positive deviation (over-inflation) was recorded in any test case.

Does the S5 ever over-inflate a soccer ball in Ball Mode?

No. All 22 test cases across both sample units produced negative deviations, meaning the S5 always stopped at or below the preset pressure. The conservative cutoff behavior ensures the ball is never over-inflated during automatic Ball Mode operation.

What pressure ranges does the S5 Ball Mode cover for soccer balls?

The S5 Ball Mode was tested across nine distinct pressure sub-ranges: 0–3, 2–4, 3–5, 4–6, 0–5, 5–8, 0–6, 6–8, and 0–8 PSI, covering the full operational soccer ball inflation spectrum up to 8.0 PSI preset target.

What is the worst-case accuracy deviation recorded for the ETENWOLF S5 in Ball Mode?

The worst-case deviation recorded was −0.70 PSI, observed in Test Case 4 (inflation range 0–3 PSI, preset target 3.0 PSI) on both Unit 1# and Unit 2#. This represents the maximum undershoot at the lowest end of the pressure range tested and is within the acceptable tolerance for ball inflation mode.

Related Products

• ETENWOLF Zephyr S5 Tire Inflator — Product Page