Agilent Varian 949-9335S001 Retrofit-Ready Rotary Vacuum Pump for RFSM Series Control Systems
The Agilent Varian 949-9335S001 is a two-stage rotary vane vacuum pump engineered as a direct retrofit replacement for legacy RFSM series dry pump systems, including the S7900 and S9500 platforms. As semiconductor fabs, industrial vacuum systems, and analytical instrument lines face increasing pressure to extend equipment life cycles, the 949-9335S001 provides a verified drop-in upgrade path that minimizes downtime, preserves existing plumbing interfaces, and eliminates the need for costly system redesigns.
Whether you are replacing a failed unit on a running production line, upgrading an aging vacuum train, or restoring a decommissioned tool to operational status, the 949-9335S001 is stocked and ready for immediate dispatch with full pre-shipment functional testing and a 12-month warranty.
Upgrade Compatibility Table
| Parameter | Detail |
|---|---|
| SKU / Part Number | 949-9335S001 |
| Brand | Agilent Varian |
| Compatible Series | RFSM S7900, S9500 |
| Pump Type | Two-Stage Rotary Vane Vacuum Pump |
| Installation Type | Direct drop-in replacement; no mechanical modification required |
| Inlet / Outlet Interface | Compatible with existing KF/NW flanged inlet connections on RFSM series |
| Power Requirements | Verify local supply voltage (100–240 VAC, 50/60 Hz) before installation |
| Communication Compatibility | Passive mechanical pump; no protocol configuration required |
| Replacement Recommendation | Recommended for units showing degraded ultimate pressure, excessive oil mist, or bearing noise |
| Commissioning Notes | Flush oil reservoir, verify gas ballast valve operation, confirm inlet isolation valve seating before first run |
| Warranty | 12 Months from date of shipment |
Retrofit Planning for Existing Automation Systems
Retrofitting a vacuum pump within an active production environment requires careful coordination across multiple subsystems. The 949-9335S001 is commonly deployed alongside the Agilent Varian DS-302 dual-stage pump and the Varian TV 301 Navigator turbomolecular pump in compound vacuum train configurations, where the rotary vane pump serves as the backing pump. In these setups, the backing pump’s ultimate pressure directly determines the turbomolecular pump’s compression ratio and overall system base pressure.
Before removing the legacy unit, engineers should isolate the inlet using the existing Varian 951-5106 right-angle valve or equivalent KF25/KF40 isolation valve, and verify that the foreline pressure gauge — typically a Varian 531 Gauge Controller with a convectron sensor — reads atmosphere before disconnecting. The oil drain and fill ports on the 949-9335S001 are positioned identically to the predecessor model, simplifying the oil change procedure during installation.
For systems integrated with a Varian Multi-Gauge Controller or a Lesker KJL Series gauge controller, no reconfiguration of the vacuum measurement chain is required. The pump’s mechanical interface to the foreline tubing — typically 1″ OD stainless or KF25 flexible bellows — remains unchanged. If the existing bellows show cracking or particulate contamination, replacement with a new KF25 stainless bellows section is recommended before commissioning the new pump.
In systems where the vacuum pump is interlocked to a PLC-based safety relay or a Siemens S7-300 / S7-1200 series controller via a dry-contact run-enable signal, the 949-9335S001’s motor contactor wiring is pin-compatible with the legacy unit. Verify the interlock logic in the PLC program — particularly the pump-on delay timer and the foreline pressure interlock setpoint — before enabling auto-start. If the system uses a Profibus DP or DeviceNet fieldbus for pump status monitoring, confirm that the existing I/O module address assignments remain valid after the swap.
For facilities running Agilent MassHunter or legacy Varian Star Workstation software, the pump replacement is transparent to the software layer, as pump status is typically monitored via analog pressure signals rather than direct pump communication. No software reconfiguration is required.
Downtime Control During System Migration
Minimizing production downtime during a vacuum pump replacement requires a structured swap procedure. The recommended approach is to pre-stage the 949-9335S001 with fresh oil filled to the correct level, inlet and exhaust ports capped, and the unit warmed to ambient temperature before the maintenance window opens. This eliminates the oil fill and warm-up steps from the critical path.
The mechanical swap itself — isolating the inlet valve, draining the old pump, disconnecting the motor supply and interlock wiring, unbolting the pump from its mounting frame, and reversing the procedure for the new unit — can typically be completed within 60–90 minutes by a trained technician familiar with the RFSM platform. The original program logic in the controlling PLC does not require modification, as the pump’s run/stop interface is a simple dry-contact signal. All ladder logic rungs, function block diagrams, and HMI faceplates referencing the pump status remain valid without editing.
After mechanical installation, a controlled pump-down sequence should be performed: start the pump unloaded with the inlet valve closed, allow 5–10 minutes for oil temperature stabilization, then slowly open the inlet valve while monitoring foreline pressure on the gauge controller. If the system includes a Varian 843 Leak Detector or an equivalent helium leak detection circuit, a brief leak check of all reconnected fittings is strongly recommended before returning the tool to production. Total commissioning time from pump-on to production-ready status is typically under 3 hours.
Retrofit Support FAQ
Q1: Is the 949-9335S001 a direct drop-in replacement for the original RFSM S7900 backing pump?
Yes. The 949-9335S001 is dimensionally and functionally equivalent to the original backing pump specified for the RFSM S7900 and S9500 platforms. Mounting bolt pattern, inlet flange size, exhaust port orientation, and motor terminal block layout are all identical to the legacy unit. No mechanical adaptation is required.
Q2: What pre-shipment testing is performed on each unit?
Every 949-9335S001 unit undergoes a full functional run-in test prior to shipment. This includes motor rotation verification, ultimate pressure measurement (target ≤ 1×10⁻³ mbar), oil mist filter integrity check, and gas ballast valve operation confirmation. A test report is available upon request. All units ship with a 12-month warranty covering defects in materials and workmanship.
Q3: Do I need to update my PLC program or HMI screens after replacing the pump?
No program changes are required. The 949-9335S001 uses the same dry-contact run-enable and fault-output interface as the original unit. All existing PLC interlock logic, HMI pump status displays, and alarm setpoints remain valid. If your system uses a Siemens S7 series or Allen-Bradley ControlLogix controller for pump sequencing, no I/O address reassignment is needed.
Q4: What is the lead time and warranty coverage?
In-stock units ship within 1–3 business days. International orders are dispatched via DHL Express or FedEx International Priority with full export documentation. The 949-9335S001 carries a 12-month warranty from the date of shipment. Warranty claims are processed within 5 business days, with advance replacement available for critical production applications upon request.
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