The Johnson Controls® DP150 Series is a line of differential pressure transducers designed to sense differential pressure across a multi-sense range. These devices are factory-calibrated and tested to ensure performance across all specified pressure ranges. The DP150 is available in four versions, each offering field-selectable range capabilities via slide switches and jumpers. Pressure units can be displayed in inches of water column (in. WC) or Pascals (Pa).
Function Description
The DP150 transducer measures differential pressure, converting it into an electrical signal for control systems. It supports both unidirectional and bi-directional modes, as well as current (mA) or voltage (VDC) output ranges. The device features a removable terminal block for easy wiring and requires a shielded cable with both ends correctly grounded for CE compliance.
Important Technical Specifications
Pressure Ranges:
The DP150 Series offers a variety of ranges depending on the product code:
- DP150MR2:
- Unidirectional (UNI) and Bi-directional (BI) ranges:
- 10.0 in. WC (±10.0 in. WC)
- 5.0 in. WC (±5.0 in. WC)
- 2.5 in. WC (±2.5 in. WC)
- 1.0 in. WC (±1.0 in. WC)
- 2500 Pa (±2500 Pa)
- 1000 Pa (±1000 Pa)
- 500 Pa (±500 Pa)
- 250 Pa (±250 Pa)
- DP150MRG:
- Unidirectional (UNI) and Bi-directional (BI) ranges:
- 5.0 in. WC (±5.0 in. WC)
- 2.5 in. WC (±2.5 in. WC)
- 1.0 in. WC (±1.0 in. WC)
- 0.5 in. WC (±0.5 in. WC)
- 1000 Pa (±1000 Pa)
- 500 Pa (±500 Pa)
- 250 Pa (±250 Pa)
- 100 Pa (±100 Pa)
- DP150MRC:
- Unidirectional (UNI) and Bi-directional (BI) ranges:
- 0.25 in. WC (±0.25 in. WC)
- 0.1 in. WC (±0.1 in. WC)
- 50 Pa (±50 Pa)
- 25 Pa (±25 Pa)
- DP150MR1:
- Unidirectional (UNI) and Bi-directional (BI) ranges:
- 1.0 in. WC (±1.0 in. WC)
- 0.5 in. WC (±0.5 in. WC)
- 0.25 in. WC (±0.25 in. WC)
- 0.1 in. WC (±0.1 in. WC)
- 250 Pa (±250 Pa)
- 100 Pa (±100 Pa)
- 50 Pa (±50 Pa)
- 25 Pa (±25 Pa)
General Specifications:
- RSS Accuracy: ±1% FS (Full Scale) at constant temperatures. This includes non-linearity, non-repeatability, and hysteresis.
- Operating Temperature: 32°F to 122°F (0°C to 50°C).
- Compensated Temperature Range: 32°F to 122°F (0°C to 50°C).
- Thermal Effects:
- Zero or span shift: 0.03/°F (0.054/°C).
- Maximum Line Pressure: 10 psi.
- Warm-up Shift: ±0.2% of total FS.
- Position Effects:
- Zero offset: 0.2% FS per g. The unit is factory-calibrated at 0g effect in the vertical position.
- Power Supply: 13 V to 30 V.
- Excitation: 24 VAC or 24 VDC (nominal).
- Output:
- 2-wire: Multi-sense current, 4 mA to 20 mA.
- 3-wire: Multi-sense current, 0 VDC to 5 VDC or 0 VDC to 10 VDC.
- Sense Resistor (for 1 V to 5 V output): 250 ohm.
Usage Features
Mounting:
The DP150 should be mounted in a vertical position for optimal performance. While calibrated for wall or perpendicular surface mounting, other orientations may cause a slight zero shift, which can be corrected using the zero adjustment feature. The device is suitable for installation on ducts, walls, ceilings, and in control rooms. It is designed for use with air or nonconducting gases; use with liquids or corrosive gases will damage the unit.
Configuration and Setup:
- Wiring: Supports both 2-wire (current) and 3-wire (current or voltage) configurations.
- Range Selection: Users can select the appropriate full-scale pressure range using a slide switch multiplier and JMP4 jumper. The LCD indicates the selected range.
- Mode Selection: Allows selection between unidirectional and bi-directional modes, as well as current (mA) or voltage (VDC) output ranges (0-5 VDC or 0-10 VDC).
- Sampling Filter: The device includes a sampling filter with four options: Normal (Nor), Slow (SLo), Fast (FAS), and Off. This filter helps manage noisy pressure environments by increasing the sample size for slower updates or reducing it for faster updates. The default setting is Normal.
- LCD Display: The LCD unit displays the pressure and toggles through existing setup parameters.
Calibration:
- Zero Adjustment: This feature allows recalibration of the unit in the field. With the unit at zero differential pressure, pressing and holding the Zero or Config button until "0" blinks will re-zero the unit. A "good" message indicates successful re-zeroing, while "bAd" indicates an unsuccessful attempt (typically if the pressure is more than ±10% off the factory setting).
- Span Adjustment: To perform span adjustment, a reference grade calibrator is required to apply positive full-scale differential pressure. The process involves entering the configuration menu, navigating to the "Set Span" setting, and confirming the adjustment. A "good" message confirms successful re-spanning, while "bAd" indicates an issue (e.g., re-zeroing pressure more than ±10% off the factory setting).
Maintenance Features
Repair Information:
If the DP150 transducer fails to operate within its specifications, the unit should be replaced. Users are advised to contact their nearest Johnson Controls representative for a replacement assembly.
Warranty:
The product is covered by a limited warranty, details of which are available on the Johnson Controls website.
Software Terms:
Use of the product's software, cloud access, or hosted services is subject to applicable end-user license, open-source software information, and other terms outlined on the Johnson Controls website.
The DP150 Series is designed for reliability and ease of use in various building automation and control applications where accurate differential pressure measurement is critical.
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