Oil and Gas Torque Sensor for Mud Logging — What to Specify Before You Quote
Buyers search oil and gas torque sensor, DC torque sensor, or electric torque sensor mud logging when rotary-table torque must sit inside a mud-logging RFQ — and the request often collapses to one vague line: "oilfield torque sensor." That hides the decision that drives fit. On live CNPS pages these devices are Hall-effect current sensors that infer rotary-table torque from drive-motor supply current — not generic shaft Nm lab transducers. This guide does not cite shaft-torque ranges from other CNPS framings.
This page turns duty into quote fields. It feeds live CNPS electric torque sensor product pages plus the mud logging solution brief, and sends one package through request a quote. Soft PDPs exist; no www.cnps.com buyer/RFQ Selection guide owns this SERP yet — treat those PDPs as feed targets, not deepen-only blockers.
Start with duty, not with a sensor label
An oil and gas torque sensor in a mud-logging package is a decision signal. Name what the signal must do before you ask for hardware:
| Duty | Question the RFQ must answer |
|---|---|
| Rig / bit operating state | Continuous view of rotary-table torque inferred from drive-motor current? |
| Mud-logging torque channel | Will the unit scale and alarm on this channel alongside other surface sensors? |
| Current → torque Hall path | Confirm Hall / clamp-on current sensing — not a shaft Nm transducer requirement? |
| Accident / bit-wear risk framing | Does the brief need torque-change monitoring tied to bit wear or operating risk (as published on the wireless page)? |
Published pages obtain rotary-table torque by testing drive-motor supply current. If you need a shaft-mounted Nm transducer instead, write that into the RFQ — this pack maps only to live Hall current→torque mud-logging PDPs.
Sensor path — map to published CNPS pages
Three live product pages (plus one alternate wired PDP URL) cover Hall torque sensing for mud logging. Use only published figures:
| Item | Mud logging electric torque sensor (SMC-ETQ-B11) | Wireless electric torque sensor | CNPS-DNJ electric torque sensor |
|---|---|---|---|
| Principle | Hall Effect; closed-loop Hall; AC/DC framing | Hall on electric-drill power cable; non-contact | AC/DC dual-purpose transmitter |
| Measuring range (current) | 0–1000 A | 0–1000 A | Rated input 1000 A–2000 A (block); Type HU-404 IPN AC+DC 1000 A |
| Output | 4–20 mA DC | 0.5–2.5 V | DC 0–5 V or 0–20 mA or 4–20 mA (block); HU-404 ISN DC 0–4 V |
| Supply | +15–30 V DC (rec. +24 V DC) | 3.5–5 VDC | ±12–±15 V or +12–+24 V (block); HU-404 VC DC +4.8 V |
| Accuracy | ±1% FS | ≤1% F.S | HU-404 ±1 (%Fs); bias ≤0.6%; linearity ≤1% |
| Frequency / bandwidth | 0–1000 Hz | 0–50 kHz | Block DC–20 Hz; HU-404 DC～20 kHz; response ≤300 ms |
| Operating temp. | −40 °C to +85 °C | −40 °C to 70 °C | HU-404 −10 °C to +70 °C |
| Other published | Open clamp; foam wrap; current direction; wiring V+ yellow / VO blue / OV brown; EX or IS; zone barriers in Unit; 2 kg | φ50 mm; IP67; EX box + bracket; G-type holder; avoid EMI; seal cavity; EX or IS; zone barriers; 2 kg; bit-wear / risk framing | Clamp w/o removing bus bar; TRMS for AC / distorted waves; temp ≤0.04%/°C; overload 10×; MTBF 2×10⁴ h; ¢50 mm; oil field + power-system fields |
Alternate wired PDP (same SMC-ETQ-B11 framing): electric torque sensor mud recording sensor. Prefer the first-column page for cited numbers.
How to read the path:
- Wired SMC-ETQ-B11 (4–20 mA) — closed-loop Hall, 0–1000 A → 4–20 mA; recommended +24 V DC; open-clamp with foam wrap and correct current direction; EX or IS with zone barriers in the Unit.
- Wireless — same Hall principle, voltage output, φ50 mm, IP67; bit-wear / accident-risk framing; EX or IS with zone barriers in the Unit.
- CNPS-DNJ transmitter — AC/DC input class and multiple outputs; clamp without removing the bus bar; TRMS for AC / distorted waveforms. Keep the RFQ oilfield/mud-logging focused — the page also lists power-system monitoring, not oilfield-only exclusivity.
Build the wider system around the mud logging solution page: sensors and package, ranges, sample points, alarms, interfaces, hazardous-area class, and service — surface mud logging ≠ LWD/MWD.
Scope stack — clamp, current direction, aperture, EMI, hazardous area, interface
Confirm each layer:
- Clamp install — open clamp / clamp without removing bus bar; foam wrap (wired SMC); G-type holder / EX box + bracket (wireless).
- Current direction — regulating-port side = input; do not reverse (wired SMC).
- Aperture — φ50 mm / ¢50 mm where published.
- EMI and sealing — avoid EMI; seal cavity when working (wireless).
- Hazardous area — EX or IS as published; zone barriers in the Unit; ask for documents (do not invent cert numbers).
- Mud logging unit interface — 4–20 mA vs 0.5–2.5 V vs DNJ outputs; acquisition, scaling, cable or wireless receiver, alarms.
No invented shaft Nm ranges, cert numbers, prices, plants, case studies, wireless radio protocols, or DNJ-vs-SMC matrix beyond published specs.
Oil and gas torque sensor RFQ checklist
- Duty — rig/bit condition monitoring, mud-logging torque channel, accident/bit-wear risk framing, or combined.
- Measurement path — Hall current→rotary-table torque (confirm); state if a shaft Nm transducer is required instead.
- Sensor path — wired SMC-ETQ-B11, wireless, or CNPS-DNJ; link the live product page.
- Current range — 0–1000 A (SMC / wireless) or DNJ published 1000 A–2000 A / Type HU-404 1000 A class as applicable.
- Signal and power — 4–20 mA, 0.5–2.5 V, or DNJ DC 0–5 V / 0–20 mA / 4–20 mA; matching supply.
- Install geometry — cable size vs aperture φ50 mm; clamp access; current-direction plan; EMI / sealing notes.
- Mud logging unit interface — acquisition system, input type, cable or wireless receiver; alarms.
- Environment — ambient temperature against published operating range; IP67 where stated.
- Hazardous area — zone; EX / intrinsically safe expectation; documents required (no invented cert numbers).
- Commercial — quantity, destination, need-by date; send via request a quote.
Send one brief
A useful request fits on one page: duty, Hall current→torque confirmation, sensor path, current range, signal and power, install geometry, logging-unit interface, environment, hazardous-area needs, and commercial fields. Missing fields get flagged in review.
Ready to quote? Start from mud logging electric torque sensor, wireless electric torque sensor for mud logging unit, and CNPS-DNJ electric torque sensor (alternate: electric torque sensor mud recording sensor), align with the mud logging solution page and mud logging buyer guide, then send via request a quote.
