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Hangzhou Kexiao Chemical Instrument & Equipment Co., Ltd.

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BrandLeiCi
ModelDGB-423
Measurement ParameterAmmonia-Nitrogen (NH₃-N)
MethodNesslerization Spectrophotometry
Light Source420 nm LED
Range0.000–4.000 mg/L
Accuracy±10% FS
Repeatability≤3% RSD
Sample Vessel16 mm OD × 100 mm glass cuvette (10 mL)
Dimensions220 × 85 × 50 mm
Weight0.4 kg
Operating Environment5–35 °C, 0–85% RH
Power Supply4 × AA alkaline batteries or USB 5 V DC
DisplayBacklit LCD with adjustable contrast and backlight timeout
Protection RatingIP65
CalibrationUp to 5-point user-defined calibration
Data ManagementGLP-compliant storage, review, deletion, and print export via USB
Firmware UpgradeableYes
ComplianceSupports audit-trail-ready data handling per GLP requirements
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BrandLeici
OriginShanghai, China
ModelDWG-8002A
Instrument TypeOnline Analyzer
Measurement PrincipleAmmonia Gas-Sensing Electrode Method
Measurement Range0.05–1000.00 mg/L NH₃–N
Accuracy±0.2 mg/L (≤2.00 mg/L)
Repeatability≤2.0% (0.10–10.00 mg/L), ≤5.0% (10.00–1000.00 mg/L)
Drift (24 h)≤0.02 mg/L (low range), ≤2% (high range)
Minimum Detection Limit≤0.15 mg/L
Output SignalIsolated 4–20 mA DC (max load 600 Ω), RS-485
Data Storage4000 measurement records + 500 calibration logs
Power SupplyAC 220 V ±10%, 50 Hz
Dimensions470 × 325 × 700 mm (L×W×H)
Weight~32 kg (dry)
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BrandLeici
OriginShanghai, China
ModelDGB-404F
Instrument TypePortable/Handheld Colorimetric Water Quality Analyzer
Measurement PrincipleDPD (N,N-Diethyl-p-phenylenediamine) Colorimetric Method
Wavelength545 nm LED Source
Measurement Range0.00–2.00 mg/L Cr(VI)
Accuracy±0.05 mg/L (≤1 mg/L)
Detection Limit≤0.02 mg/L
Calibration PointsUp to 5-point user-defined calibration
Data Storage200 measurement records with timestamp, operator ID, and calibration metadata
Cuvette Format16 mm round glass or plastic tubes
Power Supply4 × AA alkaline batteries (1.5 V) or USB 5 V DC
IP RatingIP65
Dimensions (L×W×H)230 × 85 × 50 mm
Weight~0.4 kg
ComplianceSupports GLP data integrity requirements (audit trail-capable storage, user authentication via ID entry)
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BrandLeici
OriginShanghai, China
ModelSJG-702
Measurement PrinciplespH & conductivity & TDS (electrode method), turbidity (90° light scattering), free/total chlorine & chlorine dioxide (amperometric membrane electrode)
Measurement RangespH 0.00–14.00 (±0.05 pH)
ComplianceCE, RoHS
Power SupplyAC 220 V ±10%, 50 Hz (solar option available)
Dimensions730 × 520 × 330 mm
Weight20 kg
CommunicationRS-232 / RS-485
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BrandLeici
OriginShanghai, China
ModelCOD-571
Instrument TypeBenchtop Laboratory Analyzer
Measurement PrincipleDichromate Digestion Method (2-hour reflux)
Wavelengths420 nm and 620 nm
Measurement Ranges0–150 mg/L (low-range), 0–1500 mg/L (high-range)
Accuracy±8% of reading
Repeatability≤3% RSD
Measurement Time20 min per sample (post-digestion)
Photometric Range0.000–2.000 Abs
Absorbance Accuracy±0.01 Abs or ±5%
Wavelength Accuracy±4 nm
Transmittance Error±2%
Photometric Repeatability≤0.005 Abs or 2%
Sample ThroughputBatch processing for multiple water samples
Cuvette Format10 mm square cuvettes and 16 mm round test tubes
Data Storage2000 measurement records
ConnectivityRS-232, USB, U-disk export
Power SupplyAC 100–240 V input / DC 24 V output
Dimensions (W×D×H)302 × 205 × 122 mm
Weight1.33 kg
Ingress ProtectionIP65
ComplianceGLP-compliant data traceability, audit-ready logging
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BrandLeici
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Country of OriginChina
ModelDGB-422
Instrument TypePortable
Measurement PrincipleColorimetric Method (LED-based Photometry)
Measurement Range0.000–500.0 mg/L (Ammonia Nitrogen)
Accuracy±5 mg/L
DisplayBacklit LCD with Adjustable Contrast & Timeout
Protection RatingIP65
Power Supply4 × AA Alkaline Batteries or USB 5V DC
Dimensions220 × 85 × 50 mm
Weight~0.4 kg
Operating Environment5–35 °C, 0–85% RH (non-condensing)
Cuvette Format16 mm OD × 100 mm, 10 mL capacity
CalibrationUp to 5-point user-defined calibration
Data ManagementGLP-compliant storage, recall, deletion, and print export via USB
Supported ParametersAmmonia Nitrogen, Total Hardness (Ca²⁺/Mg²⁺), Urea, Total Phosphorus, COD (Permanganate Index), Residual Chlorine, Total Chlorine, Chlorine Dioxide, Aluminum, etc.
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BrandLeici
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Country of OriginChina
ModelCOD-571-1
Digestion MethodReflux Digestion
Heating ModuleAluminum Alloy Block with PID Temperature Control
Batch Capacity21 Samples
Temperature Range100–165 °C
Time Setting Range0–120 min
Safety FeaturesOver-Temperature Alarm, Auto Power-Off upon Completion
DesignCompact Benchtop Unit with Sealed Reflux Assembly
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BrandLeichi
OriginShanghai, China
ModelSJG-208
Instrument TypeOnline DO Monitor
Measurement Range(0.0–20.0) mg/L DO, (0.0–200.0)% saturation
Temperature Range(−10.0–120.0) °C
Resolution0.01 mg/L (DO), 0.1% (saturation), 0.1 °C (temp)
Repeatability≤0.20 mg/L
Basic Error (Instrument)±0.50 mg/L (DO), ±10.0% (saturation), ±1.0 °C (temp)
Basic Error (Electronics Unit)±0.20 mg/L (DO), ±5.0% (saturation), ±0.3 °C ±1 digit
Stability(±0.20 mg/L)/24 h (instrument), (±0.10 mg/L)/24 h (electronics)
T90 Response Time≤2 min at 20 °C
OutputIsolated 4–20 mA DC (configurable upper/lower limits), RS-232 or RS-485 (user-selectable)
Relay Outputs4 programmable control relays
Data Storage400 measurement records
CalibrationZero-oxygen and full-scale calibration supported
Enclosure RatingIP65
Power SupplyAC (220 ± 22) V, (50 ± 0.5) Hz
Dimensions144 × 144 × 160 mm
Weight2.5 kg
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BrandLeichi
OriginShanghai, China
ModelSJG-791
Instrument TypeOnline Analyzer
Measurement PrincipleElectrochemical Amperometric Sensor
Measured ParameterFree Residual Chlorine
Range0.00–20.00 mg/L
Accuracy±10% (≥0.5 mg/L) or ±0.05 mg/L (<0.5 mg/L)
Resolution0.01 mg/L (Cl₂), 0.01 pH, 0.1 °C
pH Range0.00–14.00 pH
Temperature Range0.0–60.0 °C
pH Accuracy±0.05 pH
Temp Accuracy±0.5 °C
Linear Error±3.0% FS (Cl₂)
Electronic Unit Stability±1% FS/24 h
90% Response Time2 min
Enclosure RatingIP65
Power SupplyAC 220 V ±10%, 50 Hz
Dimensions166 × 166 × 110 mm
Weight2 kg
OutputDual isolated 4–20 mA DC (configurable for Cl₂ or pH), RS-232/RS-485 (Modbus RTU)
Data Storage2000 records
Auto CompensationpH and temperature compensated for residual chlorine measurement
AlarmConfigurable upper/lower limits with hysteresis
Power Failure ProtectionYes
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BrandLeici
OriginShanghai, China
ModelSJB-801
Instrument TypePortable
Detection PrincipleAnodic Stripping Voltammetry (ASV)
Detectable MetalsPb, Cd, Cu, As, Hg, Zn, Se, Mn, Ni (9 elements)
Analysis Time≤3 min per sample
Accuracy±5% (or ±5.0 µg/L for elements ≤100 µg/L
Resolution0.1 µg/L
Detection LimitsPb/Cd/Cu/As ≤0.5 µg/L
RepeatabilityRSD ≤3%
Data Storage Capacity2000 measurement records
IP RatingIP65
Power Options4×AA Ni-MH rechargeable batteries, USB power supply (5 V), external mobile power bank, or AC adapter (compatible with standard smartphone chargers)
ComplianceGLP-compliant data management, ASTM D3559, ISO 8692, USP <232>/<233>, and EPA Method 7000B (ASV adaptation)
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BrandLeichi
OriginShanghai, China
ModelJPBJ-608
Instrument TypePortable
Measurement PrinciplePolarographic Electrochemical Probe
DO Range(0.00–50.00) mg/L
Accuracy±0.30 mg/L for values ≤20.00 mg/L
Resolution0.01 mg/L (DO), 0.1 °C/°F (temperature), 0.1% (saturation)
Response Time≤45 s (90% response at 20.0 °C)
Temperature CompensationAutomatic, with manual salinity compensation
Atmospheric Pressure CompensationkPa, mmHg, atm selectable
IP RatingIP65
Data Storage500 sets
PowerRechargeable Li-ion battery, USB-C charging support (DC5V input)
Dimensions80 × 225 × 35 mm
Weight0.4 kg
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BrandLeici
OriginShanghai, China
ModelDZB-712F
Instrument TypePortable / Handheld Water Quality Analyzer
Measured ParameterspH, Conductivity, Dissolved Oxygen (DO)
IP RatingIP65
DisplayHigh-resolution color LCD touchscreen
Data Storage1000 datasets per parameter
ComplianceGLP-compliant data logging
PowerRechargeable Li-ion battery (DC5V input)
Dimensions90 × 255 × 40 mm
Weight0.5 kg
pH Accuracy±0.01 pH
Conductivity Accuracy±1.0% FS
DO Accuracy±0.30 mg/L (≤20.00 mg/L), ±10.0% (>20.00 mg/L)
Temperature Range−5.0 to 110.0 °C
Auto-Temperature CompensationYes (pH, conductivity, DO)
Electrode InterfacesTriple-combined pH electrode, composite conductivity electrode, polarographic DO electrode
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[BrandLeiCi
OriginShanghai, China
ModelDGB-480
Instrument TypePortable Water Quality Analyzer
Detection ParametersTurbidity, Color, Transmittance, Ozone, Nitrite Nitrogen, Urea, Hexavalent Chromium, Manganese, Total Nitrogen, Nitrate Nitrogen, Nitrate, Formaldehyde, Water Hardness, Zinc, Nitrite, Free Chlorine, Total Chlorine, Chlorine Dioxide, Permanganate Index, Low-Concentration COD<sub>Cr</sub>, High-Concentration COD<sub>Cr</sub>, Cadmium, Ammonia Nitrogen, Ammonium Ion, Total Phosphorus, Total Phosphate, Nickel, Ferrous Ion, Iron, Sulfite
Wavelengths365 nm, 420 nm, 470 nm, 515 nm, 540 nm, 620 nm, 650 nm, 850 nm
Turbidity Measurement90° scattered light (ISO 7027 compliant)
Colorimetric Cell CompatibilityΦ16 mm cuvettes or Φ25 mm vials
Data Storage Capacity2000 measurement records
Power SupplyRechargeable Li-ion battery (DC 5 V input support)
Dimensions105 × 241 × 90 mm
Weight0.6 kg
ComplianceGLP-compliant data traceability, ISO 7027 for turbidity]
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BrandLeici
OriginShanghai, China
ModelPXBJ-287L
Instrument TypePortable
Ion Measurement Range(−2.000 to 20.000) pX
Resolution0.001 pX
Temperature Range(−10.0 to 135.0) °C / (14.0 to 275.0) °F
pH Range(−2.000 to 20.000) pH
mV Range(−2000.00 to 2000.00) mV
Resolution (mV)0.01 mV
Accuracy (pH/pX)±0.002 pH/pX
Accuracy (mV)±0.03% or ±0.1 mV
Accuracy (Temperature)±0.1 °C
IP RatingIP65
BatteryRechargeable Li-ion
Dimensions90 × 255 × 40 mm
Weight0.5 kg
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BrandLeici
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Country of OriginChina
ModelBOD-573
Instrument TypeLaboratory BOD Analyzer
Measurement PrinciplePressure Differential Method
Measurement Range0–4000 mg/L
AccuracyComplies with HJ 505–2009 for BOD₅ precision validation (glucose–glutamic acid standard solution: BOD₅ = 180–230 mg/L)
Sample Capacity≤6 samples per run
Incubation Duration1–30 days programmable
Data Storage10 years of BOD₅ result records
Cultivation Vessel Volume580 mL
Temperature Control20 ±1 °C
Power SupplyAC 110–220 V, 50/60 Hz
Rated Power10 W
Dimensions272 × 185 × 75 mm
Net Weight2.4 kg
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BrandLeici
OriginShanghai, China
ModelSJG-792
Instrument TypeOnline Analyzer
Measurement PrincipleElectrochemical Amperometric Sensor Method
Measured ParametersResidual Chlorine, Total Chlorine
Range(0.00–5.00) mg/L
Accuracy±5% (for values >1 mg/L) or ±0.05 mg/L (for values ≤1 mg/L)
Repeatability±0.025 mg/L (≤1 mg/L)
Resolution0.01 mg/L
Limit of Detection (LOD)≤0.05 mg/L
DisplayDot-matrix LCD
Data StorageUp to 700 records with SD card export
OutputIsolated 4–20 mA DC (configurable span), RS-232 or RS-485 (Modbus RTU)
Ingress ProtectionIP65
Power SupplyAC (220 ± 22) V, (50 ± 0.5) Hz
Calibration OptionsFactory pre-loaded calibration curves, manual zero + up to two-point span calibration, in-process calibration support
Alarm FunctionsProgrammable high/low concentration thresholds
DiagnosticsBuilt-in self-diagnostic system
Power Failure ProtectionNon-volatile memory retention
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BrandLeici
OriginShanghai, China
ModelTP-585
Measurement ParameterTotal Phosphorus
Instrument TypeOnline Analyzer
Measurement Range0–50 mg/L
Accuracy±10% of reading
Repeatability≤±10%
Minimum Measurement Cycle40 min (adjustable from 5–120 min)
Digestion TimeConfigurable
Sampling Interval20–9999 min (programmable) or on-the-hour mode
Calibration Interval1–99 days (user-defined)
Maintenance Interval~30 min per month
Analog Output1 × 4–20 mA (optional 2 channels)
Communication InterfaceRS232 or RS485
Digital I/O1–6 relay outputs (220 VAC / 2 A)
Operating Environment+5 to +28 °C, ≤99% RH (non-condensing)
Power SupplyAC 220 V ±10%, 50 Hz ±1%, 5 A
Dimensions1430 × 500 × 403 mm
MTBF≥720 h
Data RetentionNon-volatile memory preserves settings and logs during power loss
Display & ControlIntegrated touch screen interface
Self-Diagnostic CapabilityReal-time fault detection with alarm prompts
Auto-CleaningIntegrated sampling line cleaning function
Valve SystemMulti-port corrosion-resistant valve assembly
TubingImported modified PTFE transparent tubing (ID >1.5 mm)
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BrandLeici
OriginShanghai, China
ModelDZB-715
Instrument TypePortable/Handheld Water Quality Analyzer
Measured ParametersWater Temperature, pH/ORP, Conductivity/Salinity, Dissolved Oxygen, Depth
Measurement RangepH (0.00–14.00), ORP (−1999.9–+1999.9 mV), Conductivity (0–200 mS/cm), Salinity (0.0–8.0 %), DO (0.00–19.99 mg/L), Temp (−5.0–70.0 °C), Depth (0.00–10.00 m)
AccuracypH ±0.10, ORP ±20.0 mV, Conductivity ±1.0% FS, DO ±0.30 mg/L, Temp ±0.5 °C, Depth ±0.05 m
ResolutionpH 0.01, ORP 0.1 mV, Conductivity down to 0.001 μS/cm, DO 0.01 mg/L, Temp 0.1 °C, Depth 0.01 m
Display3.5″ TFT color touchscreen
Data Storage5000 sets with GLP-compliant metadata
IP RatingIP67
BatteryRechargeable Li-ion
Standard Cable Length10 m (customizable up to 100 m)
InterfacesUSB, RS485
OptionalGPS module, GPRS data transmission
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BrandLeiCi
ModelDGB-427
Measurement ParameterAluminum (Al)
MethodChromazurol S Spectrophotometry
Light Source620 nm LED
Range0.000–0.300 mg/L
Accuracy±0.015 mg/L
Repeatability≤0.005 mg/L
Sample Vessel10 mL, Ø16 mm × 100 mm glass cuvette
Dimensions220 × 85 × 50 mm
Weight0.4 kg
Operating Temperature5–35 °C
Relative Humidity0–85 % RH (non-condensing)
Power Supply4 × AA alkaline batteries or USB 5 V DC
IP RatingIP65
Data ComplianceGLP-compliant data logging with timestamp, operator ID, and calibration history
ConnectivityUSB interface for PC communication and printer output
CalibrationUp to 5-point user-defined calibration
DisplayBacklit LCD with adjustable contrast and backlight timeout
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[BrandLeiCi
OriginShanghai, China
ModelDGB-402F
Instrument TypePortable
Measurement PrincipleDPD Spectrophotometry
Measurable ParametersResidual Chlorine, Total Chlorine
Range0–5 mg/L
Accuracy±0.05 mg/L (≤1 mg/L)
Repeatability≤2.0%
ResolutionConcentration: 0.001 mg/L
Absorbance0.001 ABS
LOD≤0.02 mg/L
Wavelength515 nm LED
Calibration1–3 point user-defined or factory-default curves
Data Storage200 entries per parameter
Protection RatingIP65
Operating Temperature5–35 °C
Relative Humidity≤85% RH
PowerRechargeable Li-ion battery
Dimensions85 × 230 × 50 mm
Weight~0.5 kg]
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BrandLeici
OriginShanghai, China
ModelPXSJ-226T
Instrument TypeBenchtop
Ion Measurement Range1.00×10⁻⁹ to 9.99×10⁹ (selectable units: mol/L, mmol/L, g/L, mg/L, μg/L, ppm)
Detection Limit1.00×10⁻⁹ to 9.99×10⁹ (same unit options)
Response Time≤5 s
Accuracy Class0.001
Temperature Range−10.0 to 135.0 °C (14.0 to 275.0 °F)
mV Range−2000.00 to +2000.00 mV
pH/pX Range−2.000 to 20.000
pH/pX Resolution0.001
mV Resolution0.01 mV
Temperature Resolution0.1 °C/°F
Dimensions220 × 195 × 68 mm
Weight0.95 kg
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BrandLeichi
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Origin CategoryDomestic (China)
ModelJPBJ-609L
Instrument TypePortable
Measurement PrincipleElectrochemical Probe — Clark-type Polarographic
Measurement Range(0.00–50.00) mg/L
Accuracy±0.10 mg/L (0.00–50.00 mg/L)
Resolution0.01 mg/L
Response Time≤45 s (90% response at 20 °C)
Temperature CompensationAutomatic/Manual (−10.0 to 135.0 °C)
Atmospheric Pressure CompensationkPa, mbar, Torr, atm (manual/automatic)
Salinity CompensationManual (0–50 g/L)
DO Saturation Range(0.0–600.0) %
IP RatingIP65
PowerRechargeable Li-ion battery (USB-C input, DC5V adapter compatible)
Dimensions90 × 255 × 40 mm
Weight0.5 kg
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BrandLeici
OriginShanghai, China
ModelPXSJ-216F
Instrument TypeBenchtop
Ion Measurement Range(−2.000 to 20.000) pX
Resolution0.001 pX
Temperature Range(−10.0 to 135.0) °C
Temperature Resolution0.1 °C
mV Range(−2000.00 to 2000.00) mV
mV Resolution0.01 mV
pH Range(−2.000 to 20.000) pH
pH Resolution0.001 pH
Ion Concentration Unitsmol/L, mmol/L, g/L, mg/L, μg/L
Data Storage Capacity500 sets
ComplianceGLP-compliant data logging
InterfaceRS-232, USB
IP RatingIP54
Power SupplyDC 9 V (AC 100–240 V input adapter)
Dimensions242 × 195 × 68 mm
Weight0.9 kg
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BrandLeici
ModelDWS-295F
TypeBenchtop Sodium Ion Analyzer
Measurement Accuracy±0.01 pNa
Temperature Range−5.0 to 110.0 °C
pNa Range0.00–9.00 pNa
mV Range−1999 to +1999 mV
[Na⁺] Concentration Range2.3×10⁻² to 2.3×10⁷ µg/L
Temperature Accuracy±0.2 °C
Data Storage Capacity50 sets (pNa, mV, or [Na⁺] with temperature)
InterfaceUSB
Power SupplyDC 9 V, 800 mA (center-positive)
Dimensions280 × 215 × 92 mm
Weight1 kg
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