Series
611316L SS housing & sensor (0.87" OD)
611H318LN Duplex SS housing & Hastelloy® C-276 sensor (0.87" OD)
Product page
NOSHOK
611 Series Small Diameter Submersible Level Transmitters
The NOSHOK 611 Series Small Diameter Submersible Level Transmitter delivers continuous hydrostatic liquid level measurement in slim boreholes, deep groundwater monitoring wells, standpipes, and municipal lift stations. Featuring an ultra-compact 0.87" (22 mm) outer diameter, the 611 Series fits easily into 1" inner-diameter wells. Available with standard 4 mA to 20 mA 2-wire output, digital HART® protocol with 5:1 turndown, low-power voltage outputs for remote solar/battery telemetry, and dual outputs for simultaneous level and media temperature monitoring. Built with a 316L Stainless Steel body (optional 318LN Duplex SS & Hastelloy® C-276 sensor), protective PVDF nosecone, heavy-duty vented polyurethane or FEP cable with Kevlar strain relief, and advanced 10 kA lightning protection.
Ultra-compact 0.87" (22 mm) outer diameter designed specifically for small-diameter boreholes, wells, and standpipes
Continuous hydrostatic level measurement with pressure ranges from 0-50 inH2O up to 0-100 psig (230.8 ftH2O) and absolute ranges
5:1 digital turndown capability with optional HART® communication protocol for flexible re-ranging in the field
Low power voltage output (0.1 Vdc to 2.5 Vdc) designed for solar-powered and battery-operated remote telemetry units (RTUs)
Ready for quotationShare your range, connection and case requirement.
Talk to ATHApplicationsWell head measurement, groundwater monitoring, deep boreholes, settling ponds, rainwater basins, lift stations, and open body water level
Diameter & Immersion0.87" (22 mm) outer diameter; Maximum submersion depth 325 ft (100 m)
Output signals4-20 mA 2-wire; 4-20 mA + HART®; 4-20 mA x 2 (press & temp); 0.1-2.5 Vdc 3-wire (low power); 0.1-2.5 Vdc x 2 (press & temp)
Pressure ranges0-50 inH2O to 0-100 psig (115 to 230.8 ftH2O); Absolute ranges: 25, 50, 100 psia
Accuracy±1.0% of span standard; ±0.5% of span optional (includes non-linearity, hysteresis, zero/span deviation per IEC 61298-2)
Proof pressure5 times measuring range
Power requirement4-20 mA: 8 to 36 Vdc; HART®: 12 to 36 Vdc; 0.1-2.5 Vdc (low power): 3.6 to 36 Vdc
Wetted materials316L Stainless Steel housing (318LN optional), PVDF nosecone, Polyurethane (PUR) or FEP cable, Hastelloy® C-276 sensor opt
Environmental ratingIP68 continuous submersion; CE compliant to EMC norm EN 61326; RFI/EMI/ESD shielded
Lightning protectionInternal surge protection DC 40 V, discharge current ≥ 10 kA (8/20 µs)
Part number example611 - 5 - 1 - 1 - N - 50
Technical data
Selection and ordering reference
Configure pressure range, output signal (4-20 mA, HART®, low power, dual level/temp), nosecone style, and cable length for the NOSHOK 611 Series submersible level transmitter.
Outer diameter0.87" (22 mm) Slimline
Level ranges0-50 inH2O to 0-100 psig (230.8 ftH2O)
Accuracy±1.0% std (±0.5% opt)
Output options4-20 mA, HART®, Low Power Vdc, Dual Press/Temp
Submersion depthUp to 325 ft (100 m) IP68
Surge protection10 kA Lightning Discharge
Pressure & Level Ranges
50 inH2O0 inH2O to 50 inH2O (1.8 psig)
100 inH2O0 inH2O to 100 inH2O (3.6 psig)
150 inH2O0 inH2O to 150 inH2O (5.4 psig)
250 inH2O0 inH2O to 250 inH2O (9.0 psig)
50 psig to 5 psig (11.5 ftH2O depth)
100 psig to 10 psig (23.1 ftH2O depth)
150 psig to 15 psig (34.6 ftH2O depth)
250 psig to 25 psig (57.7 ftH2O depth)
500 psig to 50 psig (115.4 ftH2O depth)
1000 psig to 100 psig (230.8 ftH2O depth)
25A / 50A / 100A0 to 25, 50, 100 psia (Absolute)
Accuracy
1±1.0% of span standard
2±0.5% of span high accuracy
Output Signal
14 mA to 20 mA, 2-wire
434 mA to 20 mA, 2-wire with HART® protocol
474 mA to 20 mA x 2 (Dual level & temperature)
480.1 Vdc to 2.5 Vdc, 3-wire (Low power for battery/solar)
490.1 Vdc to 2.5 Vdc x 2 (Dual level & temperature, low power)
Process Connection
NStandard protective PVDF nosecone
WWeighted nosecone (ballast for fast flows & deep wells)
Cable & Options
XXSubmersible Polyurethane (PUR) cable (specify feet)
38-XXSubmersible FEP cable (specify feet)
62-XXPUR cable with 1/2" NPT male conduit fitting
63-XXFEP cable with 1/2" NPT male conduit fitting
CBCCable clamp suspension assembly
LPEnhanced lightning & surge protection (10 kA)
JBNEMA 4X cable junction box with desiccant vent
Part number example
611 - 5 - 1 - 1 - N - 50
611SeriesSubmersible level transmitter
5Range0 to 5 psig (11.5 ftH2O)
1Accuracy±1.0% of span
1Output4-20 mA 2-wire
NConnectionStandard nosecone
50Cable50 ft PUR cable
Technical specifications
Diameter0.87" (22 mm) fits 1" well casings
Accuracy±1.0% std (±0.5% opt)
Output signals4-20 mA, HART®, 0.1-2.5 Vdc, Dual Press/Temp
Wetted materials316L SS, PVDF cap, PUR/FEP cable
Proof pressure5x range
Submersion depthUp to 325 ft (100 m) IP68
Operating notes
Integrated vent tube compensates for atmospheric changes to ensure exact depth readings.
Slim 0.87" body slides cleanly inside standard 1" monitoring standpipes and piezometer tubes.
Low power 0.1-2.5 Vdc output enables years of autonomous battery and solar telemetry operation.
Product Description
The NOSHOK 611 Series Submersible Level Transmitter provides highly accurate, long-term hydrostatic level measurement in deep, narrow boreholes, monitoring wells, reservoirs, and lift stations. Its slim 0.87" (22 mm) cylindrical profile allows smooth deployment inside standard 1" schedule 40/80 well casings without snagging.
Equipped with an advanced piezoresistive silicon sensor isolated behind a 316L stainless steel diaphragm, the 611 Series accurately translates hydrostatic liquid column height into a robust output signal. An atmospheric reference vent tube integrated inside the shielded cable automatically compensates for barometric pressure fluctuations.
Slimline profile fits 1" monitoring wells, standpipes, and constricted boreholes
Optional HART® protocol provides digital interrogation, calibration adjustments, and 5:1 range turndown
Dual-channel outputs allow telemetry systems to capture water level and aquifer temperature simultaneously
Heavy-duty vented polyurethane or FEP cable with integral Kevlar tensile member supports long vertical drops
Built-in 10 kA surge suppressor protects electronics from lightning strikes in outdoor exposed basins and wellheads
Ordering Information
Series611 (316L SS housing & sensor), 611H (318LN Duplex SS housing & Hastelloy® C-276 sensor)
Pressure ranges (Gauge)50 inH2O (0-50 inH2O), 100 inH2O (0-100 inH2O), 150 inH2O (0-150 inH2O), 250 inH2O (0-250 inH2O), 5 (0-5 psig / 11.5 ftH2O), 10 (0-10 psig / 23.1 ftH2O), 15 (0-15 psig / 34.6 ftH2O), 25 (0-25 psig / 57.7 ftH2O), 50 (0-50 psig / 115 ftH2O), 100 (0-100 psig / 230.8 ftH2O)
Pressure ranges (Absolute)25A (0-25 psia), 50A (0-50 psia), 100A (0-100 psia)
Accuracies1 = ±1.0% of span; 2 = ±0.5% of span
Output signals1 = 4-20 mA 2-wire; 43 = 4-20 mA 2-wire + HART®; 47 = 4-20 mA x 2 (level + temp); 48 = 0.1-2.5 Vdc 3-wire (low power); 49 = 0.1-2.5 Vdc x 2 (level + temp)
Process connectionsN = Standard PVDF nosecone; W = Weighted nosecone
Electrical / Cable optionsXX = Polyurethane (PUR) cable (specify length in feet); 38-XX = FEP cable; 62-XX = PUR cable with 1/2" NPT conduit; 63-XX = FEP cable with 1/2" NPT conduit
OptionsCBC = Cable clamp; LP = Lightning protection; JB = Cable junction box (NEMA 4X); HT = High temperature media (-40 °F to 176 °F)
Part Number Example
Standard example611 - 5 - 1 - 1 - N - 50
Series611 = Submersible level transmitter
Pressure range5 = 0 psig to 5 psig (11.5 ftH2O column)
Accuracy1 = ±1.0% of span
Output signal1 = 4 mA to 20 mA, 2-wire
Process connectionN = Standard nosecone
Cable length50 = 50 feet of submersible polyurethane cable
Product Specifications
Accuracy±1.0% of span standard; ±0.5% of span optional
Long-term stability≤ ±0.1% of span per year
Overpressure limit5 times full scale range
Media temperatureStandard: 14 °F to 122 °F (-10 °C to 50 °C); Optional (HT): -40 °F to 176 °F (-40 °C to 80 °C)
Compensated range32 °F to 176 °F (0 °C to 80 °C); Temperature effect ±0.01% / °F
Housing & Cap316L SS housing, PVDF nosecone cap (outer diameter 0.87" / 22 mm)
Submersion limitMax 325 ft (100 m) column depth; IP68 rating
Surge & LightningDischarge current ≥ 10 kA (8/20 µs rise time), DC 40 V overvoltage protection
Operating Notes
Ensure the atmospheric vent tube inside the cable remains unobstructed and dry; use a desiccant cartridge or NEMA 4X junction box (JB option) at the surface termination.
For deep wells with high flow or turbulence, the weighted nosecone (W option) provides extra ballast to keep the transmitter plumb.
When pulling or suspending the transmitter, secure by the cable clamp (CBC) without exceeding the minimum cable bend radius of 1.5 inches.
Vented cable automatically offsets barometric weather changes for true hydrostatic depth.
Low power 0.1-2.5 Vdc option draws minimal standby current for multi-year battery deployments.
HART® enabled units allow remote calibration, zero offset adjustment, and diagnostic polling.