3051 Pressure Transmitter

• Product Description

This device measures the level, density, and pressure of liquids, gases, or vapors, then converts them into a 4-20mA DC signal output. The intelligent version can communicate with a HART handheld communicator for setting, monitoring, or integration with a host computer to form a field monitoring system. The HQ-1151/3051/3851/3351DP field-adjustable intelligent differential pressure transmitter is a new product developed by our company based on field requirements. It can operate independently of a handheld communicator, allowing for field zeroing, configuration, and other operations via buttons.

Performance Specifications

(Reference conditions: No migration, silicone oil port filled, 316L diaphragm)

★Output signal: 4~20mA DC/RS485 digital communication

4~20mA DC/HART protocol digital communication (optional)

★Transmission method: Two-wire system.

★Accuracy
Accuracy: ±0.1%, ±0.2%, ±0.5% (intelligent type)

★Stability: For DP range codes 3, 4, and 5, it is +0.2% of the highest range; for other range codes, it is ±0.25% of the highest range.

★Humidity: 0~100% relative humidity.

★Start-up time: At minimum damping, a maximum of 2 seconds.

★Volume absorption: Less than 0.16cm².

★Damping: Electrical damping is 0~32 seconds. In addition, the sensing element has a constant damping time of 0.2 seconds (0.4 seconds for range 3).

★ Static Pressure Influence (DP Transmitter)
Zero-point error: +0.25% of the maximum range for 14MPa, +0.5% of the maximum range for range designation 3. This can be corrected by zero-point adjustment.

Range error: Correctable to +0.25% of the input reading every 6MPa, or +0.5% for range designation 3. This error can be eliminated by adjustment before installation.

★ Static Pressure Influence (HP Transmitter)

Zero-point error: ±1.0% of the maximum range for 32MPa. This can be corrected by zero-point adjustment.

★ Temperature Influence
Zero-point error at the maximum range: +0.5% of the range every 56°C. The total influence, including range and zero-point errors, is ±1.0% of the range every 56°C. For range designation 3, the influence is doubled.

Zero-point error at the minimum range: ±3% of the range per 56°C. Total impact includes range and zero-point error: ±3.5% of the range per 56°C. For range number 3, the impact is doubled.

★Vibration effect: Frequency 0~200Hz, +0.05% per g in any direction, upper limit.

★Power supply effect: Less than 0.005%/V of the calibrated range.

★Installation position effect: Zero-point drift not greater than (0.25kPa), this error can be eliminated by correction and has no impact on the range.

★Electromagnetic field interference/RF interference effect: Tested according to SAMA PMC33.1, from 20~000MHz, field strength can be up to 30V/m. Structural Specifications
Contact medium material:
Isolation diaphragm: 316L stainless steel, Hastelloy C-276, Monel alloy, or tantalum. (Optional) Exhaust/Drain Valve: 316 stainless steel, Hastelloy, or Monel alloy.

Process Flanges and Connectors: 316 stainless steel, Hastelloy, or Monel alloy.

O-rings in Contact with the Medium: Fluororubber, Nitrile Rubber. (Optional)

→ Filling Fluid: Silicone Oil
→ Bolts: Cadmium-plated Carbon Steel

→ Electronic Circuitry Housing: Low-copper Aluminum
→ O-ring Seals: Nitrile Rubber, Fluororubber (Optional)

→ Paint: Polyurethane.

Process Connections: For transmitters with range codes 3, 4, and 5, the center-to-center distance between the two flanges is 54 mm, with NPT1/4-18 gauge on the holes; for transmitters with range codes 6 and 7, it is 56 mm and NPT1/4-18 gauge; for transmitters with range code 2/8, it is 57.2 mm and NPTI/4-18 gauge. For transmitters with range codes 3, 4, and 5, the pressure taps on both connectors are NPT1/2-14, and the flange connectors can be flipped to provide center distances of 50.8mm, 54mm, or 57.2mm respectively.

Electrical connections: Equipped with field-connected online test terminals.

Weight: Excluding optional accessories, AP, DP, GP, and HP models weigh 2.8 kg. Usage Conditions

Overall protection performance meets: IP67 (related parameters)

★Power Supply Voltage:

16V ~ 45V DC Intrinsically safe explosion-proof products must be powered by a corresponding safety barrier (standard is 24V DC)

★Product Operating Environment

Operating Temperature: -25℃ ~ +85℃
Storage Temperature: -40℃ ~ +104℃
Humidity: 0 ~ 90%
Explosion-proof Product Operating Environment Conditions:

Temperature: -20℃ ~ +40℃

Relative Humidity: 5% ~ 95%

Atmospheric Pressure: 86 ~ 106kPa
Intrinsically safe product external safety barrier parameters:

U0≤28V DC 10≤30mA P0≤0.84W

Product Selection

Attachments and material codes installation diagram.

Domension and Mounting Instructions