Data center sensing

Data Center Liquid Cooling Sensors

Sensors for CDU, cold plate, direct-to-chip and immersion cooling systems, covering pressure, temperature, humidity, leak, level and vibration sensing.

What we measure

Sensor coverage for liquid cooling

Explore sensor technologies mapped to CDU · Cold Plates · Direct-to-Chip · RDHx · Immersion · Manifolds · Pump/Valve OEMs. Product application notes below identify where each sensor fits within this data center sub-system.

Available technologies

Sensors for Liquid Cooling

35 products · 6 categories

Not sure what you need? Tell us about your liquid cooling application and our team will recommend the right sensors.

Telaire

Wet/wet differential pressure transmitter

Applications

CDU loop ΔP across cold plates (flow-blockage detection)
Pump ΔP for wear and cavitation trending
Strainer / coolant-filter ΔP monitoring

Type: Wet/wet differential
Media: Glycol, water, oil (316 SS wetted)
Output: 4–20 mA

Custom variant

Glycol-compatible wetted materials (EPDM seals) as standard; optional NPT and G-thread process connections; extended-range version to 300 psid for primary-loop headers.

NovaSensor

NovaSensor NPI/IPT Harsh-Media Family

Applications

CDU coolant-loop pressure (primary and secondary)
Glycol fill / leak-down monitoring on closed loops

Range: 1 – 15,000 psi
Output: 4–20 mA, 0–5/10 V, I²C, SPI
Accuracy: ±0.25% FS

NovaSensor

Low-Cost Media-Compatible P+T

Applications

CDU primary and secondary loop P+T
Cold-plate inlet/outlet P+T (one device replaces two)
Chilled-water and immersion-loop P+T
CDU filter ΔP and pump-health ΔP

Tech: PT1907 MEMS die, no oil fill
Range: 15 – 600 psi
Output: I²C, SPI, 4–20 mA, Analog, SENT

Custom variant

LCMC is a platform, not a single SKU — specify range, interface (I²C / SPI / 4–20 mA / SENT), process connection and cable pigtail per CDU / compressor integration. No oil-fill keeps it glycol- and refrigerant-safe.

NovaSensor

Digital media-isolated pressure

Applications

High-pressure coolant loops on CDU primary lines and immersion manifolds (digital I²C readout)

Range: 2.5 – 300 psi (A/G)
Linearity: ±0.25% FSO (BFSL)
Interface: I²C 14-bit

Custom variant

Optional Hastelloy C diaphragm for aggressive dielectric coolants and chemistries where 316L is attacked; custom process-port thread patterns on request for OEM CDU integration.

Amphenol Sensors

High-pressure P+T with stainless-steel diaphragm

Applications

Coolant-loop P+T in one port (P + T combined)
CDU inlet/outlet P+T on high-pressure primary loops

Range: 10 – 350 bar (145 – 5000 psi)
Diaphragm: Stainless steel — universal media
Feature: P + T in one sensor body

Thermometrics

Waterproof IP68 overmolded NTC

Applications

Immersion-rated coolant temperature on CDU and chilled-water loops (JIC stainless variant)

Protection: IP68 waterproof overmold
Range: −50 to +105 °C (+125 °C ≤ 6 h)
Thermistor: 10 kΩ NTC

Custom variant

Longer probe lengths (6″ / 12″) for duct insertion; threaded SS housing for pipe immersion; networked multi-probe cable (up to 8 probes / run) for rack-row monitoring.

Thermometrics

Screw-fixed surface NTC

Applications

Ring-terminal-mount NTC on CDU pump cabinets and busbar lugs — coolant-line surface temperature where direct contact at a screw-terminal is needed

Operating: −40 to +125 °C
R @ 25 °C: 5K / 10K / 20K / 50K / 100K Ω
Form factor: Ring-terminal screw-mount

Thermometrics

Compact NTC for liquid loops

Applications

Liquid-cooling loops: rack CDU inlet/outlet temperature
BESS secondary-loop coolant temperature

Operating: −40 to +100 °C
R @ 25 °C: 2828 Ω (β 3975 K)
Thread / body: M12 × 1.5, stainless

Thermometrics

Surface-stick NTC (flat / pipe / cable)

Applications

Stick-on coolant-pipe skin temperature where retrofit on existing CDU lines is needed (no penetration)

Operating: −30 to +70 °C
R @ 25 °C: 9983 Ω (typ)
Mounting: Pressure-sensitive adhesive

Thermometrics

Inline NTC with barb fittings

Applications

Chilled-water coil inlet/outlet temperature
CDU coolant-loop inline temperature with barb fittings (no weld-in)

Operating: −40 to +120 °C
R @ 25 °C: 10 kΩ ±1.5%
Interface: SAE J-1231 / Triple-Barb

Thermometrics

Acid/moisture-resistant coated chip

Applications

Coolant and immersion-fluid temperature in harsh environments (acid / moisture exposure)
Direct-immersion temperature in two-phase / dielectric coolants where standard NTC encapsulants degrade

Operating: −40 °C to +190 °C
Compliance: AEC-Q200 Rev D · RoHS · REACH
Features: Shock-resistant · silver-migration resistant

Telaire

Dew-point / enthalpy / wet-bulb

Applications

Outdoor CDUs where dew-point / wet-bulb matters for condensation control
Extended-range ambient monitoring above standard RH/T limits

Operating env: −40 to +60 °C, 0–99% RH
Output: 4–20 mA, 0–5 V or 0–10 V
Measurands: Dew Pt · Enthalpy · Wet Bulb · Dry Bulb

Telaire

OEM board-level T+RH

Applications

Liquid-cooled rack environmental monitoring — RH+T inside CDU enclosures and adjacent dry-rack air space for condensation-risk surveillance

RH accuracy: ±2.0% RH (20–80%)
Temp accuracy: ±0.5 °C (14-bit)
Output: I²C or PDM

Amphenol

Epoxy-hardened waterproof transmitter

Applications

CDU condensation-risk monitoring at equipment drip points

RH accuracy: ±2% RH (30–95%) @ 25 °C
Feature: Withstands 100% saturation
Output: 4–20 mA, 0–5 V or 0–10 V

Thermometrics

RLDS-B / RLDS-P / RLDS-E controllers

Applications

CDU under-rack leak loops; primary/secondary loop leak containment

Type: Rope-style conductive leak detection
Family: RLDS-B / RLDS-P / RLDS-E controllers
Cable support: Up to 1,500 m (Elite positioning)

Thermometrics

Point/spot water-detection sensor

Applications

CDU and primary-loop drip-tray water detection — dry-contact alarm back to leak-monitor or BMS

Sensing R: 510 kΩ ±3% (1/4 W)
Supply: 5 VDC recommended
Operating: −40 to +85 °C

Rochester

Capacitive liquid-level transmitter (with TLL head)

Applications

CDU reservoir level (non-conductive coolants)

Probes: 500 / 1000 mm; field-cut to length
Liquids: Diesel, kerosene, non-conductive fluids
Supply: 9–36 VDC (80 V OVP, reverse-polarity)
Output: Resistive / 0–5 V / 4–20 mA (TLL head)
Accuracy: ±1% FS
Cert.: CE, RoHS; IP65 head

Rochester

Top-mount magnetic dial level gauge (mechanical)

Applications

CDU glycol reservoir local readout

Type: Top-mount 5-bolt magnetic level gauge
Accuracy: ±6 % (6700 base), ±7 % (Adjustable)
Variants: 6741 / 6781 + TwinSite® sender

Rochester

Cellular radar tank monitor (remote telemetry)

Applications

CDU reservoir / coolant tank fill-level tracking on remote / edge sites — cellular reporting without a DCIM integration

Sensing: Radar — non-invasive tank level
Network: CAT-M1 / NB-IoT cellular (FCC)
Battery life: Up to 10 years (ATEX logger)
Certifications: ATEX / IS; UL 913 Class I Div 1, Zone 0

Rochester

Guided-wave radar level transmitter

Applications

Large-reservoir CDU / thermal-storage tank level where foam or vapor defeats ultrasonic

Sensing: Guided wave radar (TDR); no moving parts
Range: Up to 3 m; <2 mm resolution
Output: 0.5–4.5 V / 4–20 mA options
Sealing: IP6K9K

Rochester

Custom float and leak switches (point level)

Applications

CDU reservoir hi/lo float alarm
Point leak-switch under manifolds and CDUs

Type: Custom-engineered float & leak switches
Capabilities: Multi-level, side-mount, continuous, P+T combos
Mfg.: IATF 16949 — Coppell, TX

Custom variant

Built-to-order: specify stem length, float material, switch action (N.O./N.C.), process fitting, cable and connector. Rochester Quick-Turn (Coppell, TX) builds from the 9871 / 9872 / 9873 / 9875 families — IATF 16949 North-American manufacturing, OEM-volume capable.

SSI

Non-contact ultrasonic level

Applications

Non-contact level in CDU reservoirs where immersion probes are unwanted

Max depth: 32" diesel / 24" gasoline
Accuracy: ±0.125"
Outputs: 3-wire resistive · voltage · DFT-110

SSI

T + Ultrasonic + Level + Concentration

Applications

CDU glycol concentration monitoring — one device reports level, temperature and glycol concentration over a single interface

Concentration: 0–50%, ±3%, 0.25% res.
Level: 20–850 mm, ±3 mm
Comm: J1939 CAN

Wilcoxon

High-MTBF industrial accelerometer

Applications

CDU pump-bearing vibration monitoring — early detection of impeller imbalance, cavitation and bearing wear before coolant-flow loss reaches the racks

Sensitivity: 100 mV/g ±5%
Response: 0.5 – 14,000 Hz
Max temp: 120 °C
Compliance: API 670; CSA / ATEX / IECEx variants

IMI

Echo® sensor + EchoPlus® wireless

Applications

CDU-pump vibration trending without running conduit to the pump skid

System: Wireless sensor + EchoPlus® JB + Receiver
Measures: Peak/RMS vel, accel, crest factor
Integration: Modbus®

Piher

Flange-mount gear-tooth speed sensor

Applications

CDU-pump RPM feedback for closed-loop flow control

Supply: 4–24 VDC (two-wire)
Max speed: 12 kHz fwd / 40 kHz (A/B)
Operating: −40 to +125 °C

Piher

Open-loop Hall-effect current sensor

Applications

Open-loop current sensing on CDU pump and heater circuits (wire-through)

Range: ±25 A – ±1,000 A
Output: Ratiometric 0.5 – 4.5 V
IP: IP67 / IP69K

Custom variant

Split-core (clamp-on) retrofit variant for installation on live feeders without disconnecting wires; custom window geometry for non-standard busbar sections on request.

Piher

Non-contact Hall-effect rotary

Applications

CDU valve-position feedback on motorized ball valves (non-contact, 50 M-cycle life)

Linearity: ±1% (±0.5% on request)
Range: Programmable 50°–360°
Supply: 5 V ±10% or 7–32 V

All Sensors

Stainless-steel piezoresistive — high media compatibility

Applications

CDU primary-loop high-pressure media-compatible monitoring (G 1/8 in or weld-ring port; PG/EG and dielectric coolant compatible)

Tech: Piezoresistive (SS 316/316L wetted)
Range: 200 mbar – 35 bar (A / G / V)
Output: mV (1.5 mA constant-current)

All Sensors

Stainless-steel piezoresistive — analog + I²C

Applications

CDU pressure monitoring with simultaneous I²C telemetry and analog control-loop output (SS-wetted, 13-bit resolution)

Tech: Piezoresistive + ASIC (SS 316/316L)
Range: 200 mbar – 35 bar / 3 – 500 psi
Output: 0.5–4.5 V ratiometric + I²C

Thermometrics

Non-invasive pipe-skin NTC clips

Applications

Non-invasive coolant-pipe temperature on CDU primary and secondary loops (no break-in retrofit)
Chilled-water plant pipe-skin temperature trending across multiple pipe diameters
Drop-in retrofit on existing whitewater and TCS lines without draining the loop

Pipe OD range: 8 – 54 mm (multiple clip sizes)
Range: −40 to +150 °C
Mount: Spring-clip, no break-in

Custom variant

Family covers OD 12.7 / 18 / 22 / 28 / 35 / 42 / 54 mm with single connector standard (M12 A-coded). Thermally-conductive non-marring TPE pad compatible with PG/EG and dielectric coolants.

Telaire

SIP through-hole T+RH module

Applications

SIP through-hole T+RH integrated on CDU control PCBs and BMS boards for board-level condensation prevention

RH accuracy: ±2.0% RH (20–80%)
Output: I²C or PDM
Package: 4-pin SIP through-hole

Thermometrics

NTC probe — water-ingression resistant

Applications

Outdoor CDU coolant lines exposed to weather, coastal / humid sites (UV + chloride + sulfate resistant per HACT testing)

Type: NTC thermistor probe; HACT-tested
Resistance: Standard NTC curves (5K / 10K / 50K Ω)
Range: −40 to +150 °C

i2s

Compact media-isolated, stainless-steel technology proven in harsh environment

Applications

CDU primary and secondary loop pressure on PG/EG and dielectric coolants (water, glycol)

Ranges: 0–10 bar / 0–40 bar (a); gage possible
Total error band: ±1.0% FSS
Output: 0.5–4.5 V ratiometric · 4–20 mA

Thermometrics

Coolant immersion probe — brass housing

Applications

CDU coolant immersion temperature on water / glycol loops — brass-housing thread-in alternative to clip-on surface sensors when an immersion probe is preferred

Type: NTC immersion probe (brass)
Resistance @ 25 °C: 2129 Ω ± 4.87%
Range: −30 to +150 °C