Tablet type dissolved oxygen meter

Introduction

A tablet type dissolved oxygen meter is a portable instrument, in the shape of a tablet or a flat handheld device, used to measure the dissolved oxygen concentration in the water and the other liquids, and it is used in the aquaculture, the environmental monitoring, the wastewater treatment, and the many other applications. The tablet type 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 or a display, and the battery, and it measures the dissolved oxygen concentration, expressed in milligrams per liter or in the percent saturation, and it displays the value, with features such as the automatic temperature compensation, the calibration, and the data logging; the tablet type dissolved oxygen meter is designed for the field and the portable use, with a flat and a compact construction, and a large display for the easy reading, 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, for the assessment of the oxygen for the aquatic life, and for many other applications; the tablet type dissolved oxygen meter provides a convenient and a reliable measurement of the dissolved oxygen. Tablet type dissolved oxygen meters are used by the aquaculture professionals, by the environmental monitors, by the wastewater operators, by the researchers, and for many other applications. With their tablet design, tablet type dissolved oxygen meters are essential for the portable dissolved oxygen measurement.

Tablet-Type Dissolved Oxygen Meter LTDO-T2010

Tablet-Type Dissolved Oxygen Meter is a compact design that measures the dissolved oxygen levels in the range of 0.00 to 90 mg/L. It is equipped with advanced a built-in microprocessor c...

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Tablet-Type Dissolved Oxygen Meter LTDO-T2010

Tablet-Type Dissolved Oxygen Meter measures dissolved oxygen from 0.00 to 20.00 mg/L. It detects saturation between 0.0 to 200%, ensuring consistent dissolved oxygen measurement accuracy...

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Standards

IEC 60746-1:2003-Expression of performance of electrochemical analyzers-Part 1: General

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. Tablet type dissolved oxygen meter for portable field measurement of DO and temperature in water.

2. Compact handheld DO tester with pen-style or pocket design, single-button operation and ATC.

3. Suitable for field testing, aquaculture, environmental monitoring, wastewater, education and quick QC.

4. Includes meter body, integrated DO probe (electrochemical or optical), batteries, calibration supplies and manual.

5. Supports fast dissolved oxygen (mg/L or % saturation) and temperature measurement in field or lab.

FAQ

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

A: The tablet type dissolved oxygen (DO) meter is used in field testing, aquaculture, environmental monitoring, wastewater, education, and quick QC for fast, portable measurement of dissolved oxygen and temperature in water, providing a compact, easy-to-use alternative to benchtop meters for on-site or routine checks. It supports aquaculture (fish/shrimp ponds, hatcheries, RAS - critical DO monitoring (most fish need >5 mg/L; pre-dawn DO crash is major risk; portable around ponds; daily checks, especially early morning; optimize aeration), environmental field monitoring (rivers, lakes, streams, reservoirs, groundwater, estuaries, coastal waters - DO is key water quality parameter (indicates organic pollution, eutrophication, aquatic habitat health; field measurement is essential (DO changes during transport/storage); BOD (biochemical oxygen demand) testing - initial DO reading), wastewater (influent/effluent DO - aeration basin control (maintain 2 mg/L for activated sludge), discharge compliance (DO >5-6 mg/L for discharge), process optimization; field screening), water treatment (drinking water (DO in source water, aeration, corrosion control; DO affects taste/odor and iron/manganese oxidation), education and student labs (classroom experiments, science fairs, teaching water quality concepts - affordable, durable, easy for students), industrial (cooling water (DO causes corrosion in boilers/cooling systems - monitor for deaeration), boiler feedwater (low DO required to prevent corrosion), process water), and home use (aquarium water (freshwater/saltwater - DO for fish health; though most aquarists use test kits, DO meters are more accurate), hydroponics (DO in nutrient solution - root health; though less common than pH/EC). Tablet/pocket DO meters are characterized by: compact size (pen or pocket), low cost, simple operation (1-3 buttons), integrated DO probe (electrochemical (Clark-type, needs membrane/electrolyte) or optical (luminescent, low maintenance, more stable), moderate accuracy (+/- 0.1-0.3 mg/L or +/- 2% saturation), auto temperature compensation (ATC), and battery operation. They are designed for quick, on-site measurements where high precision is not critical. DO must be measured in the field (DO changes with temperature, pressure, and biological activity during transport; field measurement is standard for environmental/aquaculture). This is similar to 3299 (tablet multi-parameter, includes DO) and 3287 (dissolved oxygen meter) but in a compact portable form factor with DO only - see those entries for detailed DO fundamentals, calibration, and sample compatibility. The tablet/pocket form factor is the key differentiator.

Q2: What standards does the meter comply with?

A: The tablet type dissolved oxygen meter follows relevant ISO, ASTM, EPA and GB/T standards including ISO 5814 (water quality - determination of dissolved oxygen - electrochemical probe method), ASTM D888 (standard test methods for dissolved oxygen in water - methods A (iodometric/Winkler), B (electrochemical probe), C (optical)), EPA 360.1 (dissolved oxygen by membrane electrode), and GB/T standards for dissolved oxygen meters. The hardware complies with applicable accuracy standards (typically +/- 0.1-0.3 mg/L or +/- 2% saturation, resolution 0.01 mg/L or 0.1%), ATC (automatic temperature compensation - DO solubility depends strongly on temperature), and IP rating (IP67 for waterproof pocket models). Calibration: electrochemical (Clark) - air-saturated water (100% saturation) or water-saturated air (most common, easy in field) + zero (sodium sulfite solution, for low DO); optical (luminescent) - air calibration (100% saturation) + zero (optional, more stable, less frequent calibration). For environmental compliance, follow EPA/ISO field methods (DO must be measured in field or with proper preservation; Winkler titration is reference method for compliance, but probe methods are widely accepted). For aquaculture, follow standard industry practices (DO >5 mg/L for most warmwater fish, >6 mg/L for salmonids). For wastewater, follow NPDES permit methods (EPA 360.1 or equivalent). For drinking water, follow EPA/Standard Methods. For education, follow teaching lab protocols. These are consumer/field-grade instruments, not ISO 17025 lab instruments - but can still be calibrated with traceable methods. See 3299/3287 for detailed standards.

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

A: The whole tablet type DO meter is covered by a 6-12 month warranty (consumer/field instruments often 1 year; some 2 years). The meter body, electronics, display, and temperature sensor are covered, while DO probe (wear part - electrochemical: membrane/electrolyte (3-6 months field use, replaceable cap), anode/cathode (1-2 years); optical: luminescent foil (1-2 years, replaceable); probe can foul in field/aquaculture), calibration supplies (consumable), and batteries (wear) are consumables/accessories. Damage from improper use, probe fouling (biofilm, algae, sediment - clean regularly; field/aquaculture fouling is major issue), membrane damage (electrochemical - punctured/dried membrane; replace cap), drying out electrochemical probe (must store moist/wet; dry storage damages membrane/electrolyte), dropping (pocket meters are often dropped - probe can break), water ingress beyond IP rating, using wrong calibration, battery leakage, or unauthorized repair is excluded. Extended warranty generally not available for low-cost pocket meters. Electronics last 1-3 years; electrochemical DO probe membrane/electrolyte lasts 3-6 months (field use) / 6-12 months (lab); optical DO foil lasts 1-2 years (lower maintenance); batteries 3-12 months. Optical DO probes have longer life and lower maintenance than electrochemical (Clark) probes - recommended for field use. See 3299/3287 for detailed warranty concepts.

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

A: Operation is simple (designed for field use, one-button operation). No professional training required for basic measurement, but proper calibration and probe maintenance are critical (DO is more technique-sensitive than pH/conductivity). We provide operation manuals. Proper use (electrochemical probe: remove protective cap (with storage solution or wet sponge), check membrane (no tears, electrolyte level; if low, refill/replace cap), rinse probe with DI water or sample water, turn on, allow warm-up (5-15 min for electrochemical probe to stabilize; optical is faster), calibrate (before each use or each field day: water-saturated air calibration (most common in field - wet a small amount of water in calibration sleeve/bottle, place probe in humid air above water (not submerged), wait for stable, confirm 100% saturation; or air-saturated water (shake partially filled bottle with water, measure); zero calibration (optional, for low DO <2 mg/L: immerse in fresh sodium sulfite solution (zero oxygen), wait, confirm); optical probe: air calibration (hold in air, or water-saturated air), less frequent (monthly), measurement (rinse probe with sample water, immerse probe in sample (ensure membrane/foil fully submerged, no air bubbles), stir gently or move probe (electrochemical probe consumes oxygen at membrane - MUST stir or flow to get accurate reading; stagnant water gives low readings; optical probe does not consume oxygen - no stirring needed, but still good practice), wait for stable reading (30-90 sec for electrochemical, faster for optical), read display (mg/L or % saturation + temperature), for depth profiles: lower probe to desired depth, wait, record; for BOD: measure initial DO, fill BOD bottle, incubate 5 days at 20 C, measure final DO), post-measurement (turn off, rinse probe thoroughly with DI water (remove sample residue, especially algae/sediment), shake off excess, replace protective cap (electrochemical: with storage solution or wet sponge to keep membrane moist - NEVER store dry; optical: can store dry or with cap), clean if fouled (general: DI rinse, soft brush; biofilm/algae: mild detergent or bleach solution (dilute, rinse well); sediment: soft brush; do NOT use abrasive on membrane/foil), maintenance (daily: rinse after use, check battery, store properly; weekly: clean probe (if field/aquaculture - high fouling), inspect membrane/foil (no damage), check electrolyte (electrochemical); monthly: calibrate (if used regularly), replace membrane/electrolyte (electrochemical, if needed), replace batteries; semi-annually: replace probe cap/foil (as needed), troubleshooting (readings unstable/drifting (probe fouled (clean), air bubbles on membrane (remove), low battery (replace), temperature fluctuation, electrochemical probe not stirred (MUST stir/flow - oxygen consumption causes low/unstable readings), membrane damaged (replace cap), electrolyte low (refill) - clean, remove bubbles, replace battery, stir, replace cap), readings too high (calibration error (wrong altitude/pressure (DO saturation depends on altitude/barometric pressure - meter should have altitude/pressure compensation; if not, correct manually), probe not equilibrated, membrane/foil contaminated, ATC off - recalibrate, set altitude/pressure, clean, enable ATC), readings too low (electrochemical probe not stirred (most common cause - stagnant water = oxygen depleted at membrane = low reading; stir/move probe), membrane fouled/damaged (clean/replace), calibration error, probe not fully submerged, air bubbles, battery low, zero drift (recalibrate zero for low DO) - STIR, clean/replace membrane, recalibrate, submerge, remove bubbles), meter not turning on (batteries dead, battery leakage, power button stuck, water damage - replace batteries, clean, replace meter if failed), and safety (ELECTRICAL (battery-powered, safe; do not use with wet hands on battery compartment; remove batteries for long storage), WATERPROOF (check IP rating; do not open battery cap while wet/submerged), CHEMICAL (calibration supplies (sodium sulfite (reducing agent, low hazard but avoid ingestion/eye contact), electrolyte (KCl, low hazard), cleaning solutions (bleach, detergent - handle per SDS), samples (wastewater (may contain pathogens, chemicals), aquaculture water (may contain algae toxins, pathogens), industrial water (chemicals) - wear gloves, wash hands; for cyanobacteria water, avoid ingestion/skin contact), PROBE (electrochemical membrane is delicate - do not scrape with sharp objects; do not touch membrane with fingers; store moist; optical foil is more durable but still do not scratch), do not use for samples beyond meter range (typically 0-20 mg/L or 0-200% saturation, temp 0-50 C; concentrated chemicals may damage probe), do not use in non-aqueous liquids (oils, solvents - DO probe requires aqueous; may damage membrane), for electrochemical probe: MUST stir or flow during measurement (probe consumes oxygen; stagnant water gives falsely low readings; this is the #1 user error), for optical probe: no stirring needed (more convenient in field), for field measurement: DO changes with temperature and pressure - calibrate at field temperature, set altitude/barometric pressure if meter does not auto-compensate, for BOD testing: follow Standard Methods (fill BOD bottle carefully (no bubbles), incubate 5 days at 20 C, measure initial and final DO), for aquaculture: measure DO at multiple depths and times (pre-dawn is lowest; surface may be higher due to photosynthesis; bottom may be low), for wastewater: measure in aeration basin (target 2 mg/L) and effluent (target >5-6 mg/L), do not leave probe in sample continuously for long periods (fouling; use inline sensor for continuous monitoring), store electrochemical probe moist (dry storage kills membrane in days); optical probe can store dry, for field use: carry calibration supplies, extra batteries, DI water for rinsing, extra membrane caps (electrochemical) or foil (optical)) are important. See 3299/3287 for detailed DO fundamentals and operation.

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: before each field day or each use (DO probes drift more than pH/conductivity; field conditions vary). 1-point air calibration (100% saturation) is standard for routine use; 2-point (air + zero) for low DO applications (<2 mg/L) or high accuracy. Optical probes are more stable - calibrate monthly or before each field trip; electrochemical probes need more frequent calibration (before each use or daily) due to membrane/electrolyte aging. If probe is cleaned, membrane/foil replaced, batteries replaced, or readings seem off, recalibrate. For routine field/aquaculture use, before each day is typical; for less frequent use, monthly. Routine verification: check with air-saturated water or Winkler titration periodically. Calibration method: water-saturated air (most common in field - humid air above water; easy, no standard solution needed) or air-saturated water (shake bottle). Zero: sodium sulfite solution (fresh, for low DO). Altitude/barometric pressure: DO saturation depends on altitude (higher altitude = lower DO saturation) and pressure; meter should compensate or user must correct. Temperature: DO solubility decreases with higher temp (0 C = 14.6 mg/L, 20 C = 9.1 mg/L, 30 C = 7.5 mg/L at 1 atm) - ATC is essential. For ISO 17025/compliance, follow applicable schedules and maintain records. For BOD testing, calibrate before each BOD run. When probe wears out (readings unstable, cannot calibrate, slow response, membrane/foil damaged), replace probe cap (electrochemical) or foil (optical), or replace meter. See 3299/3287 for detailed calibration concepts.

Q7: Are supporting consumables universal?

A: DO probe caps/membranes/electrolyte (electrochemical - specific to meter brand/model; use OEM or certified compatible), optical foil (specific to meter brand; use OEM), calibration supplies (sodium sulfite - universal chemical; can be lab-prepared), storage solution (KCl or DI - universal), batteries (standard AAA/AA/CR2032 - universal), and cleaning supplies are available from water quality/lab supply companies, though probe caps/foils are brand-specific (use OEM or certified compatible to maintain accuracy and warranty). Long-term consumable cost includes probe cap/foil replacement (periodic, $20-$100), calibration supplies (low cost), and batteries (periodic). Optical DO probes have lower consumable cost (foil lasts 1-2 years) vs electrochemical (membrane/electrolyte every 3-6 months). Pocket DO meters are low-cost ($50-$300) - often replaced rather than repaired when probe fails.

Q8: Can I customize parameters or supporting accessories?

A: Customization includes probe type (electrochemical (Clark-type, cheaper, needs membrane/electrolyte, must stir, more maintenance) or optical (luminescent, more expensive, low maintenance, no stirring, more stable, recommended for field)), type (pen-style (long, thin, for deep samples) or pocket/palm-sized (compact, floats)), accuracy (basic (+/- 0.3 mg/L or +/- 5% sat) or higher (+/- 0.1 mg/L or +/- 2% sat)), range (0-20 mg/L or 0-50 mg/L, 0-200% saturation, temp 0-50 C), features (ATC (standard), altitude/barometric pressure compensation (essential for accurate % saturation at altitude), auto-off, hold (freeze reading), backlit display, IP67 waterproof, replaceable probe cap/foil, data logging (some models), salinity compensation (for seawater/brackish - DO solubility decreases with salinity; important for aquaculture/marine), mg/L and % saturation display), accessories (extra probe caps (electrochemical) or foil (optical), electrolyte solution, sodium sulfite (zero), storage solution, extra batteries, lanyard/carrying case, protective cap, cleaning solution, instructions, certifications (CE, FCC, ISO 9001, IP67), language and accessories. Additional caps, foil, and accessories can be ordered separately.

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

A: Standard delivery includes tablet type DO meter, integrated DO probe, batteries, calibration supplies (initial), lanyard, and instruction manual. On-site installation is NOT applicable for portable pocket meters (no installation - calibrate and use). On-site training is not included for standard orders but can be arranged at additional cost (for aquaculture/water utility teams on calibration, probe maintenance, field technique (stirring for electrochemical, altitude compensation)). Remote guidance provided. Always calibrate with fresh air/sulfite before first field use and carry spares (batteries, probe caps/foil).

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

A: The tablet type DO meter measures dissolved oxygen in various aqueous samples in the field including natural water (rivers, lakes, streams, ponds, reservoirs, groundwater, estuaries, coastal seawater), aquaculture water (fish/shrimp ponds, hatchery tanks, RAS), wastewater (influent, effluent, aeration basins, discharge), drinking water (raw, treated, distribution), process water (industrial, cooling, boiler feed), and BOD samples (initial/final). NOT compatible with: Non-aqueous liquids (oils, solvents, pure alcohol - DO probe requires aqueous; may damage membrane), samples with high solids/sludge (can foul probe quickly - clean after use; may need probe guard; high MLSS in aeration basin can coat membrane), samples with high oil/grease (coats membrane/foil, causes drift - clean thoroughly; may damage), samples with chemicals that attack probe materials (verify membrane/foil compatibility; strong solvents, acids, bases may damage; sulfides can poison electrochemical probe (Ag anode); use optical or special probe), samples requiring very high precision/regulatory compliance (pocket meters are field-grade (+/- 0.1-0.3 mg/L); use benchtop or Winkler titration for compliance; for NPDES, use EPA-approved method with calibrated instrument), and samples beyond meter range (DO >20 mg/L (supersaturated, rare but possible in algal blooms; may exceed range), temp >50 C). For seawater/brackish: use salinity compensation (DO solubility decreases with salinity; at 35 ppt and 20 C, DO saturation = 7.6 mg/L vs 9.1 mg/L freshwater). For BOD: use BOD bottles, measure initial DO, incubate 5 days at 20 C, measure final DO; BOD = initial - final (corrected for dilution). For low DO (<2 mg/L): use 2-point calibration (air + zero) and electrochemical probe with good membrane or optical probe; wait longer for stability. For high altitude: set altitude/pressure compensation (DO at 2000 m = ~80% of sea level saturation). IMPORTANT: This tablet type dissolved oxygen meter is in the same product class as 3287 (dissolved oxygen meter) and 3299 (tablet multi-parameter, includes DO) - all measure dissolved oxygen in water. The key differences: - 3299 (Tablet multi-parameter): Benchtop, measures pH + ORP + DO + conductivity + turbidity, high accuracy, GLP/GMP, for lab use. - 3287 (Dissolved oxygen meter): General-purpose, may be portable or benchtop, moderate accuracy, DO only. - 3265 (Tablet type DO): Compact pocket/pen-style, low cost, simple operation, for field/quick checks, DO only. For detailed fundamentals of dissolved oxygen measurement (what DO is, why it matters, how electrochemical (Clark) and optical probes work, temperature/salinity/altitude effects, calibration methods, common errors, typical DO values), refer to the 3287 entry which covers these in depth. The tablet/pocket DO meter is designed for portability and ease of use, not high precision. Key user tips: (1) Electrochemical probes MUST be stirred during measurement (they consume oxygen; stagnant water = low reading). Optical probes do not need stirring. (2) Calibrate before each field day (air calibration is easy in field). (3) DO must be measured in the field (changes during transport). (4) Store electrochemical probe moist (not dry); optical probe can store dry. (5) Set altitude/salinity compensation for accurate readings. It is ideal for: - Field spot checks (environmental surveys, aquaculture ponds) - Daily monitoring (aquaculture, wastewater, aquariums) - BOD testing (initial/final DO) - Education (student labs, citizen science) - Quick QC (cooling towers, boilers) It is NOT ideal for: - Regulatory compliance (use Winkler titration or calibrated benchtop with ISO 17025) - High-precision research (use benchtop with optical probe) - Continuous inline monitoring (use inline DO sensor/transmitter) - Harsh/chemical samples (use specialized probe)