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Rosemount
Rosemount 3900 pH/ORP Sensor
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3900/3900VP: pH 0–14; ORP ±1500 mV; −10…+100 °C; ¾–1 in MNPT. RFQ variant.
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Key parameters
Measuring range
pH 0–14; ORP −1500 to +1500 mV
Accuracy
Percent linearity over pH range per PDS Table 1 (GPLR glass)
Process connection
Front ¾-in and 1-in MNPT; rear 1-in MNPT
Wetted parts
Ryton PPS body; EPDM O-ring; pH glass; ORP glass+platinum; SST solution ground; PTFE junction
Approvals
CE; ordinary-location NRTL
Type
General-purpose combination pH/ORP sensor (Rosemount 3900 / 3900VP)
Fits general-purpose liquid analysis where you need a Rosemount 3900 / 3900VP combination pH/ORP sensor—pH 0–14 or ORP −1500…+1500 mV with −10…+100 °C rating and ¾-/1-in MNPT connections.
Key advantages
- Range — pH 0–14; ORP −1500 to +1500 mV
- Process T — −10…+100 °C with automatic Pt100 TC
- Pressure — 100 psig at 212 °F class (CRN 60 psig)
- Connection — Front ¾-in and 1-in MNPT; rear 1-in MNPT
- Body — Ryton PPS; EPDM; glass/platinum ORP options
Typical applications
- Neutralization pH control.
- Cooling-tower ORP.
- General industrial pH loops.
Selection guide
- pH vs ORP element
- 3900 vs 3900VP connector
- Insertion orientation
- Transmitter pairing
Common mistakes
- Exceeding 100 psig / temperature limits.
- Mismatched VP connector to cable.
- Skipping solution-ground checks in noisy loops.
When to RFQ / what to tell us
- pH or ORP, VP vs standard.
- Transmitter, quantity, ship-to.
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Specs
| Spec | Value |
|---|---|
| SKU | 34178 |
| Brand | Rosemount / Emerson |
| Model | Model 3900 pH/ORP Sensor |
| Product type | pH ORP Sensor |
| Type | General-purpose combination pH/ORP sensor (Rosemount 3900 / 3900VP) |
| Measuring range | pH 0–14; ORP −1500 to +1500 mV |
| Process temperature | −10…+100 °C (14…212 °F) with automatic Pt-100 TC |
| Max pressure | 100 psig (6.89 barg) at 212 °F; CRN 60 psig |
| Process connection | Front ¾-in and 1-in MNPT; rear 1-in MNPT |
| Wetted materials | Ryton PPS body; EPDM O-ring; pH glass; ORP glass+platinum; SST solution ground; PTFE junction |
Documents
FAQ
Q: pH range? A: 0–14.
Q: ORP range? A: −1500 to +1500 mV.
Q: What should I send for a quote? A: Variant/transmitter, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | pH 0–14; ORP −1500 to +1500 mV |
| Accuracy | Percent linearity over pH range per PDS Table 1 (GPLR glass) |
| Process connection | Front ¾-in and 1-in MNPT; rear 1-in MNPT |
| Wetted parts | Ryton PPS body; EPDM O-ring; pH glass; ORP glass+platinum; SST solution ground; PTFE junction |
| Approvals | CE; ordinary-location NRTL |
| Type | General-purpose combination pH/ORP sensor (Rosemount 3900 / 3900VP) |
| Process Temperature | −10…+100 °C (14…212 °F) with automatic Pt-100 TC |
| Max Pressure | 100 psig (6.89 barg) at 212 °F; CRN 60 psig |
| Variants | 3900 integral cable; 3900VP Variopol VP8 quick-disconnect |
| Transmitters | Compatible with Rosemount 1066 / 1056 / 1057 / 56 (SMART calibration store) |
| Weight | ~1 lb (shipping ~2 lb) |
| Document | PDS 00813-0100-3900 Rev AD + QSG 00825-0100-3389 |