Diffused silicon pressure transmitter
Purpose
The DWP-800 transmitter is composed of a piezoresistive sensor and a signal conversion module. The core component of the sensor is a monocrystalline silicon wafer. When the monocrystalline silicon wafer is under pressure, its own resistivity will change. Four resistors are diffused on the silicon chip through the semiconductor planar process and connected to form a Wheatstone bridge. Under the action of a constant current, the voltage signal proportional to the pressure signal can be output. The signal conversion module processes the voltage signal of the sensor. Converted to 4-20mA standard signal.
DWP-800 pressure transmitter can be used to measure fluid (liquid, gas and vapor) pressure, liquid level and other parameters, and convert the measured signal into 4~20mA standard electrical signal output, which can be used as indication, record and input signal to the regulator. DWP800 pressure transmitter has the advantages of small size, light weight, high precision, low price, etc. It can be equipped with on-site indicating ammeter, zero point migration, range expansion and other functions. It can be intrinsically safe and flameproof. It has an industrial pressure transmitter. All functions.
Main technical indicators
Objects of use: liquids, gases and vapors
Range: See model specification table next page.
Output: 4.20mA DC
Load characteristics:
Input impedance
Power supply
Working power supply: 12-36V DC
Output indication: LED display, with 0-100% pointer meter
Indication accuracy: ±2%
Migration: The transmitter can be used for positive migration of 50% of the calibration range, but the upper limit of the calibration range must not exceed the upper limit. Negative transfer is not possible.
Overpressure: 2 digits of range limit (except range 7: 60MPa is 1.5 times) temperature range
Working temperature range: -25℃~80℃
Storage temperature range: -40℃~120℃
Humidity range: 0~100% relative humidity
Start-up time: 2 seconds, no warm-up required
Accuracy: ±0.2% of range, including linearity, variation, weight. The comprehensive temperature error is 0.75% of the maximum range/55°C
Vibration effect: in any direction, when the vibration frequency reaches 200Hz, the vibration error caused by it is 0.25%/g of the maximum measurement range
Time response: less than 0.2 seconds
Isolation diaphragm: 316 stainless steel
Sensor housing: 1Cr18Ni9Ti
Filling fluid: silicone oil
Process connection port: optional according to the selection data
Electrical connection: The connecting wire hole of the electronic box is a 1/2-14NPT tapered pipe screw hole, and the electrical connection terminal block is located on the terminal side of the electronic box.
Weight: about 1Kg
External dimensions
Overview
DWP-802 series pressure transmitters are specially designed and manufactured for use in the field of industrial pressure measurement, where the working conditions are general. This series of products adopts advanced German pressure sensor manufacturing technology. Composed of ceramic sensor, highly integrated electronic circuit and stainless steel shell, it has the characteristics of small size, high measurement accuracy, high anti-electromagnetic interference ability, convenient installation and adjustment, and durability.
Technical features
■ Two-wire system output 4-20mA
■The pressure range standard complies with DNI6 128
■ Equipped with diffused silicon pressure sensor:
- No loose mechanical structure
long-term stability
- Good repeatability
■The overload pressure is 2~4 times of the measured full scale pressure
■Stainless steel membrane and stainless steel process connections
■Stainless steel shell, protection class 1P65 and EP68
■High anti-electromagnetic interference capability
■Intrinsically safe
Working principle
The pressure sensor of the DWP-802 series is a standard silicon cathode strain bridge made by vacuum-depositing a semiconductor surface on a silicon substrate. There is a layer of stainless steel corrugated sheet between it and the measured medium, and an intermediary liquid-silicone oil is filled between the strain bridge and the stainless steel corrugated sheet.
When the pressure P acts on the corrugated sheet and is transmitted to the strain bridge through the intermediary liquid, the change of the bridge cathode makes the bridge balance output a series of voltage signals proportional to the pressure P. Then, it is converted into 4-20mA output by signal conversion and amplification circuit and temperature compensation.
Product Selection
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800/802 |
Diffused silicon pressure transmitter |
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Type of stress |
G |
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Gauge pressure | ||||
| A |
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Absolute pressure | |||||
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Measuring range |
1 |
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0—-100Pa~-1KPa | |||||
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2 |
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0—+1KPa~-7KPa | ||||||
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3 |
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0—-1KPa~-7KPa | ||||||
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4 |
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0—7KPa~35KPa | ||||||
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5 |
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0—25KPa~100KPa | ||||||
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6 |
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0—100KPa~350 | ||||||
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7 |
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0—200KPa~700KPa | ||||||
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8 |
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0—500KPa-3.1MPa | ||||||
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9 |
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0—1MPa~3.5MPa | ||||||
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10 |
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0—3MPa~7MPa | ||||||
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11 |
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0—7MPa~21MPa | ||||||
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12 |
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0—15MPa~35MPa | ||||||
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13 |
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0—25MPa~60MPa | ||||||
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14 |
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-100KPa—0~2.4MPa | ||||||
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Output signal |
E |
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4~20mADC | |||||
| S |
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4~20mA (with HART protocol) | ||||||
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Isolation diaphragm |
K |
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316 stainless steel, strong alkali, weak acid, occasion temperature over -40℃~80℃ | |||||
| T |
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E+H ceramic capacitors, strong corrosion, temperature -40-125 ℃ occasions | ||||||
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Accuracy class |
A |
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±0.1% | ||||||
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B |
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±0.25% | |||||||
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C |
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±0.5% | |||||||
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Process interface |
1 |
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M20×1.5 external thread | ||||||
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2 |
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1/2NPT external thread | |||||||
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3 |
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Please specify when ordering for other specifications | |||||||
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Structural form |
N |
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Normal type | ||||||
| L |
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Explosion-proof (intrinsically safe) | |||||||
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On-site display header |
0 |
Without on-site meter head (can not be noted) | |||||||
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M1 |
With 0~100% pointer head (only for PI type) | ||||||||
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M2 |
With 31/2 digits, LED display | ||||||||
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M3 |
With 31/2 digits, LCD display | ||||||||
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product name |
product model |
basic function |
remarks |
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pressure transmitter |
TKWP-802 |
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Measurement range: -100KPa-100MPa Measurement accuracy: 0.2% 0.5% Working power supply: DC12-36V output signal: 4-20mA 0-10V 0-5V 1-5V Installation screws: M20 * 1.5 1 / 2 “1 / 4″ custom specifications |
TKWP-802A is routine |
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TKWP-802B with lead lines |
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TKWP-802C for heat temperature |
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The TKWP-802C band is shown |
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TKWP-800 |
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The TKWP-800A is used in the routine |
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TKWP-800B with high heat temperature |
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pressure transmitter |
The TKWP-TG Series |
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Measuring range: -100KPa-60MPa Measurement accuracy: 0.2% 0.5% Working power supply: DC12-36V Output signal: 4-20mA 0-10V 0-5V 1-5V Installation screws: M20 * 1.5 1 / 2 “1 / 4″ custom various specifications |
pressure transmitter |
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pressure transmitter |
TKWP-806A |
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Small flat film |
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TKWP-806B |
Large flat film |
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