Series
612Heavy-Duty Submersible Level Transmitter (1.06" OD)
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NOSHOK
612 Series Submersible Level Transmitters
The NOSHOK 612 Series Submersible Level Transmitter delivers heavy-duty hydrostatic level measurement with outstanding accuracy and long-term stability. Featuring a rugged 1.06" (27 mm) 316 Stainless Steel housing and a diffused semiconductor piezoresistive sensing element isolated behind a 316L SS diaphragm, it measures liquid column heights from 0-50 inH2O up to 0-1,000 psig (2,311 ftH2O / 700 mH2O). Available with 4-20 mA 2-wire, 0-5 Vdc, 0-10 Vdc, or 0.5-2.5 Vdc outputs, standard Polyamide nosecone, 1.1 lb 316 SS weighted nosecone, or 1/2" NPT conduit adapters. Vented polyurethane, chemical-grade FEP, or water-blocked PVC cables provide continuous IP68 submersion with optional integrated PT100 RTD temperature sensors and 1.5 J lightning protection.
Continuous hydrostatic liquid level measurement for municipal water, wastewater, irrigation, wellheads, and industrial tanks
High accuracy: ±0.25% full scale (BFSL) standard; optional high accuracy ±0.125% full scale (BFSL)
Wide pressure and level ranges from 0-50 inH2O through 0-1,000 psig (up to 2,311 ftH2O / 700 mH2O depth)
Output signals: 4 mA to 20 mA 2-wire, 0 Vdc to 5 Vdc 3-wire, 0 Vdc to 10 Vdc 3-wire, and 0.5 Vdc to 2.5 Vdc 3-wire
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Talk to ATHApplicationsWater & wastewater plants, tank monitoring, deep wellhead measurement, irrigation canals, lift stations, and industrial reservoirs
Housing & Diameter316 Stainless Steel; 1.06" (27 mm) outer diameter; IP68 environmental rating
Pressure & Level ranges0-50 inH2O to 0-1,000 psig (1.8 psi to 1,000 psi / up to 2,311 ftH2O / 700 mH2O)
Accuracy±0.25% full scale (BFSL) standard; optional ±0.125% full scale (BFSL) for ranges ≥ 5 psi
Output signals4-20 mA 2-wire; 0-5 Vdc 3-wire; 0-10 Vdc 3-wire; 0.5-2.5 Vdc 3-wire
Response time≤ 1 ms (between 10% and 90% full scale)
Stability & Durability≤ ±0.2% full scale per year non-accumulating; > 100,000,000 load cycles
Power requirement10-30 Vdc (4-20 mA & 0-5 Vdc); 14-30 Vdc (0-10 Vdc); 5-30 Vdc (0.5-2.5 Vdc)
Wetted materials316 Stainless Steel, Polyamide cap (or 316 SS weighted nosecone), PUR / FEP / PVC cable with FKM O-ring
Process connectionsNosecone (N), Weighted nosecone 1.1 lb (W), 1/2" NPT male with 1/4" NPT female adapter (T)
Part number example612 - 5 - 1 - 1 - N - 50
Technical data
Selection and ordering reference
Configure level range, accuracy (±0.25% or ±0.125%), output signal, nosecone style, and submersible cable for the NOSHOK 612 Series.
Outer diameter1.06" (27 mm) Rugged 316 SS
Pressure ranges0-50 inH2O to 0-1,000 psig (2,311 ftH2O)
Accuracy±0.25% BFSL (±0.125% opt)
Output signals4-20 mA, 0-5 V, 0-10 V, 0.5-2.5 V
Response time≤ 1 ms (High speed)
Submersion depthIP68 Submersible
Pressure & Level Ranges
50 inH2O - 400 inH2O0-50 inH2O to 0-400 inH2O (1.8 to 14.4 psig)
2 / 3 / 5 psig0-2 psig (4.6 ftH2O) to 0-5 psig (11.5 ftH2O)
10 / 15 / 20 psig0-10 psig (23.1 ftH2O) to 0-20 psig (46.2 ftH2O)
25 / 30 / 60 psig0-25 psig (57.7 ftH2O) to 0-60 psig (138.5 ftH2O)
100 / 150 / 200 psig0-100 psig (230.8 ftH2O) to 0-200 psig (461.3 ftH2O)
300 - 1000 psig0-300 psig (692.5 ftH2O) to 0-1,000 psig (2,311 ftH2O)
Accuracy
1±0.25% full scale (BFSL) standard
2±0.125% full scale (BFSL) high accuracy (≥ 5 psi)
Output Signal
14 mA to 20 mA, 2-wire
20 Vdc to 5 Vdc, 3-wire
50 Vdc to 10 Vdc, 3-wire
110.5 Vdc to 2.5 Vdc, 3-wire
Process Connection
NStandard Polyamide protective nosecone
WWeighted 316 SS nosecone (1.1 lb extra ballast)
T1/2" NPT male with 1/4" NPT female threaded adapter
Cable & Options
XXPolyurethane (PUR) cable (specify feet)
38-XXFEP chemical-grade cable (specify feet)
22-XXDouble water-blocked PVC cable (> 200 psi only)
PT1Integrated PT100 RTD temperature sensor
CBCCable clamp suspension bracket
LPLightning surge protection (1.5 J per EN 6100-4-5)
JBNEMA 4X cable junction box
Part number example
612 - 5 - 1 - 1 - N - 50
612SeriesSubmersible level transmitter
5Range0 to 5 psig (11.5 ftH2O)
1Accuracy±0.25% BFSL
1Output4-20 mA 2-wire
NConnectionStandard nosecone
50Cable50 ft PUR cable
Technical specifications
Diameter1.06" (27 mm) 316 SS
Accuracy±0.25% BFSL (±0.125% opt)
Output options4-20 mA, 0-5 V, 0-10 V, 0.5-2.5 V
Wetted materials316 SS, Polyamide, PUR/FEP/PVC cable
Response time≤ 1 ms
Submersion depthIP68 Submersible
Operating notes
Atmospheric reference tube compensates for ambient barometric fluctuations automatically.
Weighted nosecone (1.1 lb) stabilizes sensor positioning in turbulent basins and pump wells.
High accuracy options provide reliable inventory monitoring in chemical and water storage tanks.
Product Description
The NOSHOK 612 Series Submersible Level Transmitter is designed for demanding industrial and municipal level monitoring applications where high accuracy, rugged construction, and long service life are essential. Featuring a 316 stainless steel housing and diffused semiconductor sensor, it provides precise measurement unaffected by surface turbulence or foam.
The vented cable incorporates an internal capillary tube with a double water-block barrier, ensuring automatic atmospheric compensation while preventing moisture migration into the sensor housing. Available with weighted nosecones for high-flow sumps and optional PT100 RTD elements for concurrent thermal profiling.
High-precision sensing cell delivers ±0.25% or optional ±0.125% BFSL accuracy
Broad range capability up to 1,000 psig (2,311 ftH2O) accommodates deep wells and high-pressure tanks
Multiple analog output choices allow seamless integration with PLCs, SCADA, and panel meters
Optional weighted 316 SS nosecone (1.1 lb) keeps sensor stable in agitated wastewater lift stations
Built-in lightning protection (1.5 J per EN 6100-4-5) protects remote field installations from electrical storms
Ordering Information
Series612 (Heavy-duty submersible level transmitter)
Pressure ranges (inH2O / psig)50 inH2O, 100 inH2O, 150 inH2O, 200 inH2O, 400 inH2O, 2 (0-2 psig / 4.6 ftH2O), 3 (0-3 psig / 6.9 ftH2O), 5 (0-5 psig / 11.5 ftH2O), 10 (0-10 psig / 23.1 ftH2O), 15 (0-15 psig / 34.6 ftH2O), 20 (0-20 psig / 46.2 ftH2O), 25 (0-25 psig / 57.7 ftH2O), 30 (0-30 psig / 69.2 ftH2O), 60 (0-60 psig / 138.5 ftH2O), 100 (0-100 psig / 230.8 ftH2O), 150 (346.3 ftH2O), 200 (461.3 ftH2O), 300 (692.5 ftH2O), 350 (807.9 ftH2O), 500 (1154.2 ftH2O), 750 (1733.3 ftH2O), 1000 (2311.0 ftH2O)
Accuracies1 = ±0.25% full scale (BFSL); 2 = ±0.125% full scale (BFSL) (ranges ≥ 5 psi)
Output signals1 = 4-20 mA 2-wire; 2 = 0-5 Vdc 3-wire; 5 = 0-10 Vdc 3-wire; 11 = 0.5-2.5 Vdc 3-wire
Process connectionsN = Nosecone; W = Weighted nosecone (1.1 lb); T = 1/2" NPT male with 1/4" NPT female adapter
Electrical / Cable optionsXX = Standard Polyurethane (PUR) cable (specify feet); 38-XX = FEP cable; 22-XX = Water-blocked PVC cable (> 200 psi only)
Options & AccessoriesPT1 = PT100 RTD sensor; CBC = Cable clamp; FE = Filter element; DC = Desiccant cartridge; LP = Lightning protection; JB = NEMA 4X cable junction box
Part Number Example
Standard example612 - 5 - 1 - 1 - N - 50
Series612 = Heavy-duty submersible level transmitter
Pressure range5 = 0 psig to 5 psig (11.5 ftH2O column depth)
Accuracy1 = ±0.25% full scale (BFSL)
Output signal1 = 4 mA to 20 mA, 2-wire
Process connectionN = Standard protective nosecone
Cable length50 = 50 feet of submersible polyurethane cable
Product Specifications
Accuracy±0.25% full scale (BFSL) standard; optional ±0.125% (BFSL)
Overpressure safetyProof pressure: 2x range; Burst pressure: 4x range
Temperature limitsMedia: 14 °F to 122 °F (-10 °C to 50 °C); Compensated: 32 °F to 122 °F (0 °C to 50 °C)
Housing & Nosecone316 SS housing (1.06" / 27 mm OD), Polyamide cap or 316 SS weighted nosecone
Submersion & IngressIP68 continuous deep liquid submersion
Vibration & Shock15 g according to IEC 60068-2-6; Shock 100 g according to IEC 60068-2-27
Operating Notes
Use a desiccant cartridge (DC) or NEMA 4X junction box (JB) at the surface cable termination to protect the atmospheric vent tube from ambient moisture ingestion.
In turbulent sumps or pump lift stations, install the transmitter inside a stilling pipe or specify the weighted nosecone (W option).
Suspension via the cable clamp (CBC) prevents cable jacket pinch and maintains correct vertical sensor alignment.
Ultra-fast response time ≤ 1 ms captures rapid liquid surges in pump stations.
Optional PT100 RTD sensor provides process temperature measurement over the same cable.
Double water-blocked cable design protects internal sensor components against accidental flooding.