Touchscreen dissolved oxygen meter

Introduction

A touchscreen dissolved oxygen meter is a dissolved oxygen meter with a touchscreen interface, used for the measurement of the dissolved oxygen concentration in the water and the other liquids, and it is used in the environmental monitoring, the aquaculture, the wastewater treatment, and the many other applications. The touchscreen dissolved oxygen meter consists of a dissolved oxygen sensor, which may be an electrochemical or an optical (luminescent) sensor, a signal processing circuit, a touchscreen display and the control, and it measures the dissolved oxygen concentration, expressed in milligrams per liter or in the percent saturation, with the automatic temperature compensation, and it displays the value, with features such as the touchscreen operation, the calibration, the data logging, and the connectivity; the touchscreen dissolved oxygen meter provides a convenient and an intuitive operation, and it is available as the benchtop and the portable models, and it is used for the measurement of the dissolved oxygen in the aquaculture ponds, in the rivers and the lakes, in the wastewater, in the industrial processes, for the monitoring of the water quality, and for many other applications; the touchscreen dissolved oxygen meter is an essential instrument for the dissolved oxygen measurement. Touchscreen dissolved oxygen meters are used by the aquaculturists, by the environmental monitors, by the wastewater operators, by the laboratory technicians, and for many other applications. With their touchscreen interface, touchscreen dissolved oxygen meters are essential for the convenient dissolved oxygen measurement.

Touchscreen Dissolved Oxygen Meter LTSDO-T2010

Touchscreen Dissolved Oxygen Meter features a compact, benchtop design ideal for measuring dissolved oxygen levels in a variety of samples. It is equipped with advanced a large 7-inch co...

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Standards

JJF 2294-2025-Calibration specification for on-line low-level dissolved oxygen meters

IEC 60746-4:2018-Expression of performance of electrochemical analyzers-Part 4: Dissolved oxygen in water

Complies with the above standards, but is not limited to them.

Features

1. Touchscreen dissolved oxygen meter for high-accuracy DO measurement with intuitive color touchscreen interface.

2. Advanced benchtop or portable DO analyzer with optical or electrochemical sensor, graphical calibration and data logging.

3. Suitable for aquaculture, environmental, water treatment, wastewater, beverage and research laboratories.

4. Includes meter body, DO sensor/probe, temperature sensor, calibration supplies, power and operation manual.

5. Supports dissolved oxygen measurement in mg/L or % saturation with automatic temperature, salinity and pressure compensation.

FAQ

Q1: What testing scenarios is this meter mainly applied to?

A: The touchscreen dissolved oxygen (DO) meter is used in aquaculture, environmental monitoring, water treatment, wastewater, beverage, and research laboratories for high-accuracy dissolved oxygen measurement with the convenience of a color touchscreen for easy calibration, data review, and regulatory compliance (GLP/GMP). It supports aquaculture (fish/shrimp ponds - DO is the most critical water quality parameter; monitor pre-dawn (lowest DO) and afternoon; >5 mg/L for most fish, >4 for shrimp; early morning DO crash is major killer; touchscreen allows easy data logging and trend review), environmental monitoring (rivers, lakes, streams, groundwater, estuaries - field or lab measurement; DO indicates organic pollution (BOD), aeration, ecological health; per ISO 5814, ASTM D888), wastewater treatment (influent/effluent, activated sludge aeration basins (control aeration energy, target 2 mg/L), discharge compliance (NPDES permits), water treatment (drinking water (DO affects taste, corrosion, treatment; monitor after aeration), process water, boiler feedwater), beverage (brewing (wort aeration (target 8-10 mg/L for yeast), dissolved oxygen in finished beer (low DO <0.1 mg/L for shelf life - oxidation causes staling; measure at packaging, fermenter, bright beer), wine, soft drinks), research/education (limnology, oceanography, ecology, water quality research, teaching labs; data logging for experiments), and pharmaceutical (purified water, WFI - though DO less critical, but monitored in some processes; cell culture media (DO for mammalian cell culture bioreactors - though bioreactors have integrated probes)). Touchscreen interface provides: intuitive calibration (graphical, step-by-step), simultaneous DO + temperature display, data logging (with time/date/operator/calibration metadata), method storage, GLP/GMP compliance (user login, audit trail, calibration records), and connectivity (USB/Ethernet/LIMS). Higher accuracy than basic meters (typically +/- 0.1 mg/L or +/- 0.5% saturation) with multi-point calibration and advanced sensors (optical recommended for low maintenance).

Q2: What standards does the meter comply with?

A: The touchscreen dissolved oxygen meter follows relevant ISO, ASTM, EPA, IEC and GB/T standards including ISO 5814 (water quality - determination of dissolved oxygen - electrochemical probe method), ISO 5813 (water quality - determination of dissolved oxygen - iodometric method (Winkler) - reference), ASTM D888 (standard test methods for dissolved oxygen in water - parts A (electrochemical), B (Winkler)), ASTM D5462 (standard test method for dissolved oxygen in water (on-line/field)), EPA Method 360.1 (dissolved oxygen by membrane electrode), EPA Method 400-F (field measurement), IEC 61010 (lab equipment safety), and GB/T standards for dissolved oxygen meters. The hardware complies with applicable analytical instrument standards (accuracy +/- 0.1 mg/L or +/- 0.5% saturation, resolution 0.01 mg/L), EMC (IEC 61326), and IP rating (for portable/field use). Calibration uses air-saturated water or water-saturated air (100% saturation) and zero-oxygen solution (sodium sulfite + cobalt chloride, or N2-purged water) per ISO 5814/ASTM D888. For wastewater discharge, follow EPA/NPDES permit methods. For beverage/brewing, follow ASBC (American Society of Brewing Chemists) or MEBAK methods (low DO measurement in beer requires special technique - avoid air exposure, use flow-through cell or sample carefully). For regulated labs, follow ISO 17025 and maintain calibration records. Touchscreen meters with data logging and user management support GLP/GMP (calibration records, audit trail, 21 CFR Part 11 if electronic records). For pharmaceutical, follow USP if applicable and cGMP.

Q3: What is the warranty period for the whole meter and key components?

A: The whole touchscreen DO meter is covered by a 12-24 month warranty (analytical instruments often 2 years; some 3 years). The meter body, touchscreen, electronics, and temperature sensor are covered, while DO sensor/probe (wear part - electrochemical: membrane/electrolyte degrades 6-12 months, anode/cathode consumes; optical: lumiphore degrades 2-5 years), calibration solutions (consumable - sodium sulfite zero solution), membranes/electrolyte (electrochemical only - replacement kits), and power supply are consumables/accessories. Damage from improper use, probe fouling (biofilm, algae, sediment on membrane/cap - clean regularly; field/wastewater is high-fouling), dry storage of electrochemical probe (must store with moist sponge or per manufacturer - drying damages membrane/electrolyte), dropping (portable units), liquid ingress into meter, touchscreen damage, or unauthorized repair is excluded. Extended warranty and service contracts (calibration, sensor replacement) may be available. Electronics/touchscreen last 5-10 years; electrochemical sensors need membrane/electrolyte replacement every 6-12 months and full probe replacement 1-3 years; optical sensors last 2-5 years (lumiphore degradation).

Q4: Is this device difficult to operate? Is professional training required?

A: Operation is straightforward with touchscreen interface (guided calibration, on-screen help). No professional training required for basic measurement, but proper calibration and sensor maintenance are critical for accuracy (DO is sensitive to temperature, pressure, and sensor condition). We provide operation manuals and on-screen guidance. Proper setup (connect power/battery, turn on, allow warm-up (15-30 min for electrochemical stabilization; optical is faster), connect DO probe and temperature probe (ATC), prepare calibration (air calibration: hold probe in air with water-saturated atmosphere (wet sponge in calibration chamber, or air-saturated water; enter altitude/barometric pressure for correction (DO solubility decreases with altitude); or Winkler/azide calibration for high accuracy), zero calibration (sodium sulfite solution (2% Na2SO3 + cobalt chloride catalyst) or nitrogen-purged water; for high accuracy or low-DO measurements; optical sensors may not need zero routinely), calibration via touchscreen (navigate to DO calibration, select points (air 100% and/or zero 0%), follow prompts: rinse probe, gently shake off excess water, hold in humid air (not direct airflow, not direct sun), wait for stable reading (30-60 sec), confirm; for zero: immerse in zero solution, wait, confirm; touchscreen displays calibration status, slope, and saves; for best accuracy: 2-point (air + zero); calibrate before each use or at start of day (field calibration drifts, especially electrochemical), sample measurement (select method, rinse probe with sample water first (to avoid buffer/carryover), immerse probe fully (ensure no air bubbles on membrane/cap; for electrochemical: gently stir or move probe (Clark electrode consumes oxygen - stagnant water gives low readings); optical: no stirring needed), wait for stable reading (30-60 sec; electrochemical needs flow), touchscreen displays DO (mg/L or % saturation) and temperature, save/record (with GLP metadata: time, date, operator, calibration info, sample ID), for wastewater/aeration: probe directly in basin (natural stirring), for deep water: use cable to lower probe to desired depth (profile), for beverage/low DO (beer): use flow-through cell or carefully fill sample without agitation (agitation increases DO; measure immediately, minimize air exposure), post-measurement (rinse probe thoroughly with clean water (remove sediment, biofilm), clean if fouled (soft brush, mild detergent; do not scratch membrane/cap), store properly (electrochemical: with moist sponge in cap or storage solution; optical: dry or per manufacturer; never let electrochemical membrane dry out), maintenance (daily: rinse after use, check calibration (air check), weekly: clean probe (field/wastewater = high fouling), inspect membrane/cap (electrochemical: replace if damaged/fouled/electrolyte depleted; optical: inspect cap for scratches/damage), monthly: full 2-point calibration, replace membrane/electrolyte (electrochemical: every 1-3 months depending on use/fouling), sensor replacement (electrochemical: 1-3 years; optical: 2-5 years or when readings unstable/drift), troubleshooting (readings unstable/drifting (probe fouled (biofilm, sediment - clean), air bubbles on membrane (remove), electrochemical needs stirring (stir gently), sensor aging (replace), low battery, temperature fluctuation - clean, remove bubbles, stir, replace sensor, charge), DO readings too low (electrochemical not stirred (oxygen depletion at membrane - stir), probe not equilibrated, calibration at wrong altitude, membrane fouled, zero drift, sample not representative (too deep, near sediment) - stir, wait, enter altitude, clean, recalibrate, sample properly), DO readings too high (air bubbles on membrane, probe in sunlight (algae photosynthesis produces O2 - shade probe), calibration error, temperature compensation off, sample agitated (for beverage) - remove bubbles, shade, recalibrate, verify ATC, minimize agitation), sensor not reading (cable loose/disconnected, membrane damaged (electrochemical), probe failed, battery low - check cable, replace membrane/probe, charge), meter/touchscreen issues (frozen, unresponsive - restart, clean screen), and safety (WATER/ELECTRICAL (portable meter near water - do not immerse meter body (only probe), ensure IP rating for field use; battery-powered is safer than mains), CHEMICAL (zero solution (sodium sulfite - reducing agent, irritant; cobalt chloride - toxic (do not ingest, wear PPE); calibration solutions - handle per SDS, dispose properly; wastewater samples may contain pathogens, chemicals - wear gloves, eye protection), BIOLOGICAL (pond/wastewater may contain pathogens, algae toxins (cyanobacteria/microcystin - avoid ingestion, wear gloves), ENVIRONMENT (do not discard calibration solutions into water bodies - dispose properly), SUNLIGHT/HEAT (do not leave meter in direct sun (overheats, damages display; optical sensors can be affected by bright light - shade probe), handle electrochemical probe carefully (membrane is fragile - do not touch, do not scratch, do not let dry)) are important for accurate DO measurement.

Q5: What is the typical lead-time for order delivery?

A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.

Q6: Is regular calibration required? What is the recommended calibration cycle?

A: Calibration recommended: single-point air calibration before each use or at start of each field day (DO sensors drift, especially electrochemical); full 2-point calibration (air + zero) every 1-3 months or for high-accuracy/low-DO work. If probe is cleaned, membrane replaced, sensor changed, meter dropped, or readings seem off, recalibrate immediately. Routine verification: check in air-saturated water or humid air before each sampling session. For ISO 17025/commercial labs, follow applicable schedules and maintain records (calibration certificates, altitude/barometric pressure, as-found/as-left data, sensor ID). For wastewater NPDES compliance, calibrate per method (EPA 360.1) before each use and after each 8 hours of continuous use. DO measurement is highly sensitive to temperature and pressure - always enter correct altitude/barometric pressure for air calibration, and use ATC. Optical sensors are more stable (less frequent calibration) but still verify before use. For low-DO measurements (<1 mg/L, e.g., beer, anoxic wastewater), zero calibration is essential (single-point air calibration is insufficient at low end).

Q7: Are supporting consumables universal?

A: DO sensor/probe (replacement - specific to meter brand/model (Hach, YSI, Hanna, etc.; electrochemical and optical are not interchangeable; use OEM or certified compatible), membrane/electrolyte kits (electrochemical only - brand-specific), calibration solutions (zero solution (sodium sulfite) - can be lab-prepared or purchased; DO standards are not typically used (air is standard)), BOD bottles (if BOD probe - standard lab glassware), batteries (standard AA/9V - universal), and cleaning supplies are available from water quality/lab supply companies, though sensors and membrane kits are brand-specific (use OEM or certified compatible to maintain accuracy and warranty). Long-term consumable cost includes sensor replacement (periodic, $100-$500+) and membrane/electrolyte (electrochemical, regular).

Q8: Can I customize parameters or supporting accessories?

A: Customization includes sensor type (electrochemical (galvanic/polarographic Clark electrode - cheaper, needs membrane/electrolyte maintenance, consumes oxygen (needs stirring), affected by H2S (poisons silver anode); good for general use) or optical (luminescent/fluorescence quenching - no electrolyte, no oxygen consumption (no stirring needed), low maintenance, more stable, not affected by H2S, better for low DO and field; recommended for most applications)), parameters (DO only, or multi-parameter (DO + pH + ORP + temperature + conductivity + salinity + turbidity + BOD)), form factor (benchtop (lab, high accuracy, more features, power supply) or portable/field (battery, rugged, IP67 - touchscreen is more common on benchtop, but some portable have color displays)), cable length (1 m for benchtop/surface, 3-30 m for deep water profiling, BOD probe for lab bottles), display/interface (color touchscreen (size 3.5-7 inch), graphical calibration, simultaneous DO+temp, method storage, data logging (1000-10000+ points), USB/Ethernet/WiFi/Bluetooth export, PC software, LIMS integration, GLP/GMP compliance (user ID/password, audit trail, electronic signatures, 21 CFR Part 11), alarms (calibration due, out-of-range), multi-language), accessories (extra sensor/probe (electrochemical/optical, BOD, long cable), calibration kit (zero solution, calibration chamber), membrane/electrolyte kits (electrochemical), flow-through cell (for low-DO/beverage), BOD bottles, spare batteries, carrying case (field), probe guard, calibration certificate (ISO 17025), IQ/OQ package (for pharma/GMP), certifications (CE, FCC, ISO 9001, IP67), language and accessories. Additional sensors, cables, and accessories can be ordered separately.

Q9: Does the purchase include on-site installation and commissioning service?

A: Standard delivery includes touchscreen DO meter, DO sensor/probe, temperature probe, calibration supplies (initial), power supply/batteries, probe stand (benchtop), and instruction manual. On-site installation is not required for standard benchtop/portable meters (unbox, connect sensor, calibrate, use). On-site training is not included for standard orders but can be arranged at additional cost (for environmental/wastewater/aquaculture teams on calibration, sensor maintenance, field sampling, data management, and GMP documentation). Remote guidance provided. For GMP/pharma use: IQ/OQ and validation can be arranged. Always calibrate before use.

Q10: What types of samples are compatible with this equipment?

A: The touchscreen dissolved oxygen meter measures DO in various aqueous samples including natural water (rivers, lakes, streams, ponds, reservoirs, groundwater, estuaries, coastal seawater - field measurement), wastewater (influent, effluent, activated sludge, aeration basins, trickling filters - may be turbid/high particulate (probe needs cleaning)), drinking water (raw water, treated water, distribution system), aquaculture water (fish ponds, shrimp ponds, hatchery tanks, RAS, aquaponics - high organic, high fouling), beverage (beer, wort, wine, juice (low DO measurement needs special technique - sample without agitation, flow-through cell; measure immediately)), process water (industrial, cooling, boiler feed), and hydroponic/nutrient solutions. NOT compatible with: Samples with high oil/grease (coats membrane/cap, causes drift - clean thoroughly; may damage optical cap), highly corrosive samples (strong acids/bases beyond probe range - verify chemical compatibility of membrane/cap materials; sulfide (H2S) poisons electrochemical silver anode (use optical or sulfide-resistant probe), samples containing solvents/organics that attack membrane materials (verify compatibility), non-aqueous liquids (oils, solvents - DO meters are for aqueous; may damage sensor), and very low DO (<0.01 mg/L, e.g., boiler water, anoxic digester) without high-sensitivity probe/zero calibration (standard probe may not resolve; use trace DO sensor or Winkler method). For BOD (biochemical oxygen demand): use BOD probe and standard method (5-day incubation, EPA 405.1/ISO 5815). For seawater: enter salinity correction (DO solubility decreases with salinity; most meters have salinity compensation). IMPORTANT: Touchscreen dissolved oxygen meter fundamentals: (1) What it measures: Dissolved oxygen (DO) = molecular oxygen (O2) dissolved in water. Units: mg/L (ppm) or % saturation. Saturation = amount of O2 water can hold at given temp/pressure/salinity (100% = fully saturated). Water at 20 C, 1 atm, freshwater: ~9.08 mg/L saturation. Colder water holds more O2 (0 C: 14.6 mg/L; 30 C: 7.5 mg/L). Higher altitude = lower saturation (less atmospheric pressure). Salinity reduces DO (seawater holds ~20% less than freshwater at same temp). (2) Why DO matters: - Aquatic life: Fish need >5 mg/L (salmonids >6); below 2-3 = stress/death. - Wastewater: Aeration basins need ~2 mg/L for activated sludge bacteria; effluent DO limits (NPDES). - Drinking water: DO affects taste (flat if low), corrosion (high DO corrodes iron/steel), treatment (aeration removes iron/manganese, CO2, H2S). - Beverage: Beer/wine need LOW DO (<0.1 mg/L packaged) to prevent oxidation/staling; wort needs HIGH DO (8-10 mg/L) for yeast fermentation. - Corrosion: High DO accelerates corrosion in boilers, pipelines (deaeration used). (3) Sensor types: - Electrochemical (Clark electrode): Membrane (PTFE) allows O2 diffusion to cathode (gold) where reduced; current proportional to DO. Galvanic (self-generating) or polarographic (needs voltage, warm-up). Consumes oxygen at membrane (needs stirring/flow). Membrane + electrolyte (KCl) need replacement every 6-12 months. Affected by H2S (poisons silver anode). Cheaper. - Optical (luminescent): Blue light excites lumiphore on cap; red emission quenched by O2 (Stern-Volmer). Does NOT consume O2 (no stirring needed). No electrolyte, low maintenance, more stable, not affected by H2S, better for low DO. Lumiphore degrades over 2-5 years. More expensive but recommended. (4) Calibration: - Air calibration (single-point): Probe in water-saturated air (100% humidity) = 100% saturation. Enter temp, altitude, salinity. Most common for field. - Zero calibration (two-point): Sodium sulfite (Na2SO3) solution scavenges O2 -> 0 mg/L. Improves accuracy at low DO. Needed for low-DO samples (beer, anoxic). - Winkler method (iodometric, ISO 5813, ASTM D888 B): Chemical titration reference method. Used for high accuracy and to calibrate/check meters. Slow, lab-based. (5) Field measurement best practices: - Measure ON-SITE (DO changes during transport). - Calibrate before each use/day. - Rinse probe with sample before measurement. - Remove air bubbles from membrane/cap. - Electrochemical: stir gently or move probe (oxygen consumption). Optical: no stirring needed. - Shade probe from direct sunlight (algae photosynthesis, optical interference). - Report DO with temperature, altitude, salinity. - For depth profiles: lower probe slowly, allow equilibration at each depth. (6) Low DO measurement (beverage/anoxic): - Minimize agitation (agitation dissolves oxygen). - Use flow-through cell or carefully fill sample (overflow, no headspace). - Measure immediately. - Use optical sensor (more accurate at low end). - Perform zero calibration. - For beer: ASBC methods specify sampling and measurement technique (avoid air contact, use flow-through or sealed BOD bottle). (7) Common errors: - Not calibrating (biggest error - DO sensors drift). - No stirring (electrochemical = low readings). - Air bubbles on membrane (high readings). - Wrong altitude/barometric pressure (air calibration error). - Probe fouling (biofilm, sediment - low/unstable; clean after each use). - Electrochemical membrane dry (permanent damage - store wet). - Direct sunlight (photosynthesis, optical interference). - Ignoring temperature/salinity (DO solubility depends on both; use compensation). - Transporting sample (DO changes - measure on-site). - H2S poisoning (electrochemical in wastewater with sulfide - use optical). (8) DO ranges: - Saturated (air-equilibrated): 8-15 mg/L (depends on temp). - Good for fish: >5 mg/L. - Stress: 2-5 mg/L. - Lethal: <2 mg/L (warm water fish), <5 (salmonids). - Wastewater aeration: 1-3 mg/L (target 2). - Anoxic: <0.5 mg/L (denitrification). - Anaerobic: 0 mg/L (septic, sludge digestion). - Packaged beer: <0.1 mg/L (desired for shelf life). - Wort aeration: 8-10 mg/L (for yeast).