DPT-MOD

dpt

Differential pressure transmitter with Modbus communication and input module

The DPT-MOD Differential Pressure Transmitter for air conforms to Modbus over serial line protocol, using RTU transmission mode and RS485 interface. The digital output signal is sent over Modbus enabling the DPT-MOD to connect directly to a field communications network.

DPT-MOD requires less wiring than traditional 3-wire transducers, since multiple devices can be connected on serial line.

The Series is comprised of the standard version (DPT-MOD) and the DPT-MOD-IN version that features an Input Module (-IN). The -IN module enables reading of multiple other signals such as temperature or control relays over Modbus.
The -IN module has two input channels designed to accept 0−10V, ntc10k, Pt1000, Ni1000/(-LG), and BIN IN (potential free contact) signals. For example, DPT-MOD with input module can read values from one differential pressure measurement point and two temperature measurement points. Hence, the DPT-MOD does the work of three transmitters.

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Applications

DPT-MOD series devices are commonly used in HVAC/R systems for:

• fan, blower and filter monitoring
• pressure and flow monitoring
• valve and damper control
• pressure monitoring in clean rooms

Specifications

Performance

Accuracy (pressure over operating temperature range): DPT10-MOD:
Ranges Ranges ≥1.0 inWC = ±1.5% FS
DPT30-MOD: ±1.5% FS
(Accuracy specifications include: general accuracy, temperature drift, linearity, hysteresis, and repetition error).
Long Term Stability: (Typical 1 yr)
Without (-eZ) function
DPT10-MOD: ≤ 0.032 inWC
DPT30-MOD: ≤ 0.096 inWC
With (-eZ) function
DPT10-MOD: ≤ 0.004 inWC
DPT30-MOD: ≤ 0.004 inWC
Thermal Effects:
Temperature compensated across the Full Spectrum of capability.
Overpressure: Proof Pressure: 100 inWC

Communication

Protocol: MODBUS over Serial Line
Transmission Mode: RTU
Interface: RS485 Byte format (11 bits) in RTU mode:
Coding System: 8–bit binary Bits per Byte:
1 start bit
8 data bits, least significant bit sent first
1 bit for parity (See Configuration)
1 stop bit
Baud rate: selectable in Configuration
MODBUS Address: 1−247 addresses selectable in configuration menu.
Zero Point Calibration Options:
• Automatic with function
• Manual pushbutton Auto-Zero
• Via MODBUS write coil
Response Time:
0.8 sec, 2.0 sec, or 10 sec selectable in configuration menu.

Technical Specifications

Media Compatibility:
Dry air or non-aggressive gases
Measuring units:
inWC
Measuring element:
Piezoresistive
Environment:
Operating Temperature:
14 −122°F (-10 − 50°C)
with (-eZ) function
23 −122°F (-5 − 50°C)
Configuration, while using display
32 −122°F (0 − 50°C)
Storage Temperature:
-4 −158°F (-20 − 70°C)
Humidity:
0 to 95% RH, non condensing

Physical

Case:
Dimensions: 3.54” x 3.74” x 1.4” (90.0 x 95.0 x 36.0 mm)
Weight: 5.3 oz. (150 g)
Mounting: 2 each 11/64” (4.3mm) screw holes, one
slotted
Materials: Case: ABS (UL 94 V-0 Approved)
Lid: PC (UL 94 V-0 Approved)
Protection standard:
IP54 / NEMA3

Display (Configuration only)
1-Line Display
Size: 0.80” W x 0.40” H
(20.3 x 10.2 mm)
Electrical Connections:
5 screw terminal block
Wire: 12-24AWG (0.2 – 1.5 mm2)
Cable Entry:
Strain Relief: M20X1.5
Knockout: 0.787” (20mm)
Pressure Fittings:
3/16” (5.2mm) barbed brass
+ High pressure
− Low pressure

Electrical

Voltage:
Input: 24VAC or VDC, ±10%

Conformance

Meets requirements for CE marking:
EMC directive 2004/108/EC
RoHS Directive 2002/95/EC

Meets safety requirements for electrical equipment for measurement, control, and laboratory use: ETL marking, standard IEC61010-1.

Tested and meets product approval requirements by the NRTL certified testing laboratory.

Model summary

DPT-MOD-10 DPT-MOD-20
Measurement ranges (inWC) 0 − 10 0 − 20
Description Model# Part# Model# Part#
Differential Pressure Transmitter with Modbus configuration DPT-MOD-10 10038 DPT-MOD-20 10042
- with DPT-MOD-10-eZ 10039 DPT-MOD-20-eZ 10043
- with input module DPT-MOD-10-IN 10040 DPT-MOD-20-IN 10044
- with and input module DPT-MOD-10-eZ-IN 10041 DPT-MOD-20-eZ-IN 10045
Input module only -IN 10046 -IN 10046

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Product datasheet

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