This report was conducted under BioNexus Labs' annual statutory safety audit obligation under the Factories Act, 1948, and the Laboratory Biosafety Guidelines of the ICMR. The following sections document findings relevant to Lab Block C electrical and cryogenic safety systems.
| Parameter | Audit Finding (12 March 2025) |
|---|---|
| Equipment ID | LN-07 — Linde Kryotechnik KG-200 liquid nitrogen workstation |
| Safety board model | Siemens SENTRON PAC3200 integrated interlock board (firmware v4.2.1) |
| Voltage cutoff setting | 48V (factory default, verified operational) |
| Earth bonding conductor | Intact and correctly torqued at casing lug — 2.0 Nm confirmed |
| Phase routing | Correct — no deviations from wiring diagram BNL/ELEC/LC-07/2023 |
| Panel cover screws | All 4 × T20 Torx screws present and fully tightened |
| Overall condition | PASS — No deficiencies identified |
| Next audit due | March 2026 |
The Siemens SENTRON PAC3200 safety board firmware configuration (including voltage cutoff, overcurrent thresholds, and interlock trip settings) may only be modified by personnel holding a valid SENTRON Specialist Certification (Siemens module SENT-3: Advanced Safety Override Procedures). This certification requires a 3-day Siemens-run training course and written examination. The certification is equipment-specific and must be renewed every 5 years.
As part of this audit, SSEL verified the list of SENTRON-certified personnel at BioNexus Labs against Siemens' certification register (India & South Asia). The following individuals hold valid SENTRON Specialist Certification for SENTRON PAC3200 equipment as of the audit date:
| Name | Role | Cert. No. | First Issued | Renewal Due | Status |
|---|---|---|---|---|---|
| Dr. Anil Reddy | Co-founder / Lead Researcher | AR-SENT-14/0281 | September 2014 | September 2024 — renewal outstanding | LAPSED (note: SSEL flagged to BNL management) |
| Kavitha Nair | Co-founder / CEO | KN-SENT-19/0392 | March 2019 | March 2024 — renewed March 2024 | VALID |
| Ravi Teja | CTO | RT-SENT-21/0447 | July 2021 | July 2026 | VALID |
| Item | Finding |
|---|---|
| PPE availability — LN-07 workstation area | Lab-grade nitrile gloves (Size S, M, L) available in dispenser mounted above workstation. Cryogenic-rated gloves (different type) available in cabinet below. Stock of Size M standard nitrile: 1 full box (100 gloves) at time of audit. |
| Service cupboard (Lab Block C, sub-corridor) | Contains general lab consumables including banana plug calibration leads (red and black, multiple lengths). Cupboard not locked — latched only. Accessible to all Level 1 badge holders in Lab Block C. |
| Internal service corridor BNL-SERV/B2C | Inspected for fire safety compliance. Push-bar handles functioning on both ends. Corridor is used for equipment transport between Blocks B and C. No electronic monitoring present. |