QiWei Microcomputer Portable Conductivity Meter Series (DDB-11A & DDBJ-350) Malaysia: In-Depth Engineering Application Analysis & Technical Specifications
QiWei Microcomputer Portable Conductivity Meter Series (DDB-11A & DDBJ-350) Malaysia: In-Depth Engineering Application Analysis & Technical Specifications
In water treatment plants, chemical processing facilities, pharmaceutical manufacturing, food and beverage production, power generation boiler feedwater loops, environmental monitoring stations, and research laboratories across Malaysia, precise measurement of electrolytic conductivity is essential for assessing ionic purity, salt content, and solution concentration. Whether verifying ultra-pure water systems or monitoring high-salinity industrial effluent, technicians require a robust portable instrument capable of multi-range precision without sacrificing field durability. As a premier precision analytical and field instrument provider rooted in Puchong, Selangor, MTM Precision Sdn. Bhd. supplies the QiWei Microcomputer Portable Conductivity Meter Series (DDB-11A and DDBJ-350)—engineered for microprocessor-controlled accuracy, wide four-decade measuring spans, platinum black electrode technology, and reliable benchtop-to-field performance.
Moving beyond basic catalog specifications, this article provides an in-depth engineering application analysis of the QiWei DDB-11A and DDBJ-350 microcomputer portable meters across four core operational pillars:wide multi-range conductivity profiling, DJS-1 platinum black electrode architecture and pure-water capability, temperature compensation differentiation (manual vs. automatic), and microcomputer stability.
1. Wide Multi-Range Conductivity Measurement Spans
Because industrial liquids range from high-purity deionized water to concentrated chemical process solutions,a versatile meter must maintain high resolution across diverse salinity levels:
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Four-Decade Measuring Range: Both the DDB-11A and DDBJ-350 span four distinct sub-ranges to cover everything from low-conductivity purified water up to highly conductive brines:
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0 ~ 199.9 µs/cm(Resolution:0.1 µs/cm) -
200 ~ 1999 µs/cm(Resolution:1 µs/cm) -
2.00 ~ 19.99 ms/cm(Resolution:0.01 ms/cm) -
20.0 ~ 199.9 ms/cm(Resolution:0.1 ms/cm)
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High Measurement Accuracy: Delivers electronic meter accuracy of ±1.0% FS and matched system accuracy of ±1.5% FS, ensuring dependable quality control across industrial production lines and environmental sampling points.
2. DJS-1 Platinum Black Electrode & Pure Water Adaptability
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Robust DJS-1 Platinum Black Sensor: Equipped with a durable DJS-1 platinum black electrodedesigned to maximize active surface area, minimize polarization errors, and ensure linear response across high-conductivity solutions.
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Ultra-Pure Water Compatibility: When paired with optional constant
0.1specification electrodes, the instruments excel in measuring the conductivity of high-purity and ultra-pure water used in electronics rinsing, pharmaceutical WFI (Water for Injection) loops, and power plant steam cycles.
3. Temperature Compensation Architecture: Manual (DDB-11A) vs. Automatic (DDBJ-350)
Because electrolytic conductivity varies significantly with thermal changes (standardized at a temperature coefficient of 2.0% / °C):
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DDB-11A (Manual Temperature Compensation): Operates within a 10 ~ 50°C compensation scope using manual temperature entry, making it an economical, highly reliable instrument for routine laboratory and planned field testing.
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DDBJ-350 (Automatic Temperature Compensation): Features an independent 018 temperature electrode paired with the DJS-1 sensor, providing real-time automatic temperature compensation (ATC) across 10 ~ 50°C to instantly correct for thermal fluctuations in dynamic process streams.
4. Official Technical Specifications & Model Comparison Matrix
| Technical Parameter | DDB-11A | DDBJ-350 |
| Measuring Range |
0 ~ 199.9 µs/cm200 ~ 1999 µs/cm2.00 ~ 19.99 ms/cm20.0 ~ 199.9 ms/cm |
0 ~ 199.9 µs/cm200 ~ 1999 µs/cm2.00 ~ 19.99 ms/cm20.0 ~ 199.9 ms/cm |
| Resolution | 0.1 / 1 µs/cm ; 0.01 / 0.1 ms/cm |
0.1 / 1 µs/cm ; 0.01 / 0.1 ms/cm |
| Accuracy |
Meter:
±1.0% FSMatched:
±1.5% FS |
Meter:
±1.0% FSMatched:
±1.5% FS |
| Temperature Compensation Scope | 10 ~ 50°C (Manual temperature compensation) |
10 ~ 50°C (Automatic temperature compensation) |
| Temperature Coefficient | 2.0% / °C |
2.0% / °C |
| Basic Configuration | DJS-1 (platinum black) electrode, 1408 µs/cmconductivity standard calibration solution |
DJS-1 (platinum black) electrode, 018 temperature electrode, 1408 µs/cm conductivity standard calibration solution, 4 × DC1.5V batteries |
5. Localized Professional Support: MTM Precision's Commitment
Equipping your water treatment facility, industrial plant, or analytical laboratory with the right portable conductivity meter ensures strict process control and rapid fault detection across all operating environments.As an authorized partner in Malaysia, MTM Precision Sdn. Bhd. provides comprehensive technical consultation, conductivity calibration standards, replacement electrodes, and after-sales support from our Puchong showroom and service center, backed by:
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Water Quality Instrumentation Consulting: Expert guidance to match manual (DDB-11A) or automatic temperature compensated (DDBJ-350) meters to your specific industrial or environmental testing standards.
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Local Service & Spare Parts Support: Dedicated technical assistance, calibration guidance, and accessory supply right here in Selangor.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
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Email: mtmpre@yahoo.com
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WhatsApp: +6016-660 7346
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Office Tel: +603-80807172
13 Nov 2026
