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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Set Point | 25 Torr (factory set, tamper-proof) |
| Available Setting Range | 10 to 150 Torr |
| Deadband | 20 Torr + 5% of setting |
| Repeatability | ±5 Torr + 2% of setting |
| Proof Pressure | 0 psia to 15 psig |
| Operating Temperature | 0°F to 130°F (−18°C to 54°C) |
| Wetted Materials | 316L stainless steel per F20 |
| Surface Finish | 5 Ra typical |
| Internal Volume | 2.22 cc (with 1/4″ fitting) |
| Process Connection | 1/4″ MVCR |
| Electrical Connection | Free leads / crimp / D-sub (per H16K config) |
| Contact Type | Hermetically sealed |
| Cycle Life | 5 million cycles minimum |
| Approvals | UL, CE, ISO 13849 (SIL 3 capable) |
| Construction | Fully welded, secondary seal |
4. Product Introduction
The UE Precision Sensors E48W-H16K is a factory-set absolute pressure switch designed for high-purity gas systems in semiconductor, vacuum, and process equipment. It switches at a fixed 25 Torr setpoint referenced to absolute zero, so barometric changes do not affect operation.
Welded 316L construction, 5 Ra finish, and hermetically sealed contacts keep the process side clean. The 1/4″ MVCR process connection and low internal volume (2.22 cc) make it a direct fit for many existing gas panels and tool interlocks where a reliable, non-adjustable absolute switch is required.
E48W-H16K
E48W-H16K
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Switch does not change state | Setpoint not reached or wiring open | ✅ High | Apply known vacuum below 25 Torr; check continuity across contacts | Verify actual system pressure with calibrated gauge |
| False trips / chatter | Pressure near deadband or vibration | ✅ Medium | Monitor pressure stability around 25 Torr | Confirm deadband is acceptable for the process |
| No continuity when expected | Open contacts or damaged leads | ✅ High | Measure resistance across switch leads with power off | Replace unit if contacts remain open under correct pressure |
| Leak at process connection | Fitting or seal issue | ❌ Low–Medium | Helium leak check or pressure decay test | Re-make MVCR connection; inspect for damage |
| Switch works but process alarms | Wrong setpoint for current recipe | ❌ Low | Confirm required trip point vs. 25 Torr factory setting | Order correct setpoint if 25 Torr is incorrect |
| Intermittent operation | Contaminated or moisture in lines | ❌ Low | Inspect upstream filtration and dryness | Clean or dry system; switch itself is rarely at fault |
If the switch fails electrical continuity tests under controlled vacuum and the process connection is verified leak-tight, photograph the nameplate and wiring, then contact support with the diagnostic data.
6. Frequently Asked Questions (FAQ)
Q: What does the “25 Torr” mean on the E48W-H16K?
A: The switch is factory-set to actuate at 25 Torr absolute. The setting is tamper-proof and cannot be field-adjusted. If your process requires a different trip point, you need a different part number.
Q: Is this a gauge or absolute switch?
A: Absolute. The reference is sealed vacuum, so atmospheric pressure changes do not shift the trip point. Use it when barometric variation would cause problems with a gauge switch.
Q: Can I use it on liquid media?
A: The E48W series is intended for high-purity gas service. Confirm media compatibility with 316L and the internal volume before installing on anything other than clean dry gas.
Q: What is the difference between new surplus and used units?
A: New surplus units have never been installed. Used units have been removed from equipment and functionally tested. Both are supplied with our verification data; OEM warranty does not apply in either case. We provide our own coverage.
Q: Does the switch have adjustable deadband?
A: No. Deadband is fixed by design (approximately 20 Torr + 5% of setpoint). It is not field-adjustable.
Q: What electrical load can the contacts handle?
A: Hermetically sealed contacts are typically rated for low-level signals or modest DC loads (exact rating depends on the specific contact material in the H16K configuration). Do not switch high inductive loads without an interposing relay.
Q: Is the 1/4″ MVCR connection standard?
A: Yes for this part number. Other E48W variants use different end seals or flanges. Verify the process connection matches your existing hardware before ordering.
