ShenzhenYijiajie Electronic Co., Ltd.
| Payment Terms | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability | 2200 |
| Delivery Time | 5-8 days |
| Packaging Details | Box pack |
| Heater Resistance | 95 Ω ± 10 Ω (at room temperature) |
| Heater Power Consumption | ≤ 300 mW |
| Sensitivity | ≥ 5 (at 50 ppm NH₃) |
| Concentration Slope | ≤ 0.6 |
| Sensitive Element Resistance (Rs) | 1 kΩ – 30 kΩ (at 50 ppm NH₃) |
| Warm-up Time | ≥ 48 h |
| Brand Name | YJJ |
| Model Number | MP702 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C, D/A, D/P, T/T, Western Union, MoneyGram | Supply Ability | 2200 |
| Delivery Time | 5-8 days | Packaging Details | Box pack |
| Heater Resistance | 95 Ω ± 10 Ω (at room temperature) | Heater Power Consumption | ≤ 300 mW |
| Sensitivity | ≥ 5 (at 50 ppm NH₃) | Concentration Slope | ≤ 0.6 |
| Sensitive Element Resistance (Rs) | 1 kΩ – 30 kΩ (at 50 ppm NH₃) | Warm-up Time | ≥ 48 h |
| Brand Name | YJJ | Model Number | MP702 |
| Place of Origin | CHINA | ||
| High Light | YJJ MP702 ammonia gas sensor ，planar semiconductor NH3 sensor ，0-100PPM gas sensor with warranty | ||
Product Description:
YJJ MP702 0-100PPM Planar Semiconductor Ammonia (NH3) Gas Sensor
Features:
MP-702 planar semiconductor ammonia (NH3) gas sensor, with metal packaging, is suitable for detecting ammonia concentrations ranging from 0 to 100 ppm. Its typical applications include ammonia leakage monitoring in refrigerators and cold storages, as well as risk control in aquaculture.
Parameters Sign / Unit Value / Condition Remarks
Detected gas — Air ammonia (NH3) —
Detection range ppm 0 - 100 ppm —
Loop voltage VC ≤ 24 V DC —
Heating voltage VH 5.0 V ± 0.1 V AC/DC —
Load resistance RL Adjustable —
Heating resistance RH 95 Ω ± 10 Ω (at room temperature) —
Heating power consumption PH ≤ 300 mW —
Sensitivity S ≥ 5 (at 50 ppm NH3) S = Rs (air) / Rs (50 ppm NH3)
Concentration slope α ≤ 0.6 α = R100 ppm / R30 ppm NH3
Sensitive body resistance Rs 1 kΩ - 30 kΩ (at 50 ppm NH3) —
Standard test conditions — 20 ℃ ± 2 ℃; 65% ± 5% RH; VC = 5.0 V ± 0.1 V; VH = 5.0 V ± 0.1 V —
Preheating time — ≥ 48 h —
Form / Packaging — Metal packaging, 4 pins 1, 2 pins for heating; 3, 4 pins for measurement
Typical characteristics and usage tips
Working principle: Metal oxide semiconductor gas-sensitive layer, conductivity increases with NH3 concentration, and Rs changes are converted into voltage output through RL.
Response and recovery: Highly sensitive to ammonia, response/recovery is fast, suitable for real-time monitoring.
Environmental impact: Sensitivity is affected by temperature and humidity. Standard test conditions are 20 ℃ / 65% RH; calibration and use should be performed under similar temperature and humidity.
Installation and soldering: Prefer manual soldering; 250 ℃ ≤ 3 s; use the least chlorine-containing rosin flux; avoid volatile silicon substances, corrosive gases, and strong shock and vibration.
Circuit connection and selection tips
Dual voltage supply: VC is the measurement circuit voltage (≤ 24 V DC), VH is the heating voltage (5.0 V AC/DC); connect 1, 2 pins for heating, 3, 4 pins for measurement, they can share the power supply, pay attention to polarity.
RL selection: Convert Rs changes into VRL through RL; RL can be optimized according to the target output range and noise requirements (commonly in the kΩ range).
Long-term storage and aging: Unpowered long-term storage will drift, before use, it is necessary to fully age (1 - 6 months ≥ 72 h; > 6 months ≥ 168 h).
Specifications:
| Parameter | Symbol/Unit | Value/Condition |
| Detected Gas | — | Ammonia (NH₃) |
| Detection Range | ppm | 0 – 100 ppm |
| Circuit Voltage | Vc | ≤ 24 V DC |
| Heater Voltage | Vh | 5.0 V ± 0.1 V AC/DC |
| Load Resistance | Rₗ | Adjustable |
Company Details
Business Type:
Manufacturer,Trading Company
Year Established:
2006
Total Annual:
900000-1000000
Employee Number:
50~80
Ecer Certification：
Verified Supplier
Yijiajie Electronics is a full range of silicon pressure sensors from the United States, FREESCALE/, GE, MEAS, SMI, and a full range of sensing and control products from the United States pressure, temperature and humidity, gas flow, current, Hall effect, etc., Japan HAMAMATSU flame, UV sensors, ph... Yijiajie Electronics is a full range of silicon pressure sensors from the United States, FREESCALE/, GE, MEAS, SMI, and a full range of sensing and control products from the United States pressure, temperature and humidity, gas flow, current, Hall effect, etc., Japan HAMAMATSU flame, UV sensors, ph...
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