DPU91-Series

Multi-Parameter Input Transmitter

Models In Stock

Large Auto-Sensing Backlit Display
“Dial-Style” Digital Bar Graph
Intuitive and “User-Friendly” Interface
Optional Field Upgradable Relays

See Product Overview

DPU91-Series

From ^£ 524.05

Models In Stock

Shop Models

2 Variations available

See all series options below

Data Sheet

Product Overview

Accuracy ± 0.5 %
Accuracy Detail ± 0.5% or reading maximum error @ 25°C (77ºF)
Additional Features 1 Field Mount, Sensors
Altitude,Max 4000 m
Conductivity Measurement 0.0000 to 99999 μS
Control Characteristics Dry-Contact Relays: 2 Open Collector: 1 Type: SPDT N/A Form C: N/A Maximum Current Rating: 5 A resistive 50 mA DC Maximum Voltage Rating: 30 Vdc or 250 Vac Hysteresis Adjustable: Absolute in engineering units (EUs) Latch Reset: In test screen only Delay: 9999.9 seconds (maximum) Test Mode: Set on/off Cycle Time: 99999 seconds (maximum) Maximum Pulse Rate: 400 pulses/minute Proportional Pulse: 400 pulses/minute Volumetric Pulse Width: 0.1 to 3200 s Pulse Width Modulation: 0.1 to 320 s
Display Measuring Units kΩ, MΩ, ms, ppb, ppm, μS
Display Note LCD Contrast: 5 settings
Display Type Backlit LCD
Display Type Note Backlit, 7 and 14-segment LCD
Electrical Connection Screw Terminal
Electrical Output 4 to 20 mA
Enclosure Material PBT
Enclosure Ratings IP65, NEMA Type 4X
Form factor 1/4 DIN
Frequency 0.5 to 1500 Hz
Input Note Digital Serial: ACSII, TTL level, 9600 bps Frequency Input: Sensitivity: 80 mV @ 5 Hz, gradually increasing with frequency Span: 0.5 Hz to 1500 Hz @ TTL level input
Input Type Pulse, S3L
Input Type Note Digital or AC Frequency: pH/ORP input via the digital output from the PHTX-2750 pH/ORP sensor electronics Conductivity/Resistivity: Input directly from OMEGA conductivity/ resistivity electrodes via direct conductivity/resistivity module or via CDTX-2850
Keypad 4 buttons, injection-molded silicone rubber seal
LED Indicators “Dial-style” digital bar graph, LEDs for open collector, relays and warning indicator
Measurement Type Flow, pH, ORP, conductivity, salinity, pressure, temperature, batch
Mounting Specified to Omega field mount junction boxes
Number of Channels 1
ORP Measurement Range -1999 to 1999.9 mV
Output Detail 4 to 20 mA (10.8 to 35.2 Vdc, 30 mA maximum)
Over-Voltage Protection 48 V transient protection device current limiting for circuit protection and reverse-voltage protection
PH Measurement Range 0 to 15 pH
Relative Humidity 0 to 100% condensing for field mount; 0 to 95% non-condensing for panel mount
Repeatability ±0.2% of reading
Resolution 1 μS
Sensor Voltage 4.9 to 5.5 Vdc @ 25°C, regulated short circuit protected
Series ID DPU91-Series
Storage Temperature, Max 70 °C
Storage Temperature, Min -15 °C
Supply Power Note DPU91 without Relay Module: 200 mA @ 10.8 to 35.2 Vdc DPU91 with Relay Module: 300 mA @ 10.8 to 35.2 Vdc
Supply Voltage 10.8 to 35.2 Vdc
Update Rate 1 sec
Weight 0.63 kg
Wire Gauge 14 AWG

Supported Applications

The Omega DPU91 Series Multi-Parameter Input Transmitter is a single-channel interface designed for measuring process parameters including flow, pH/ORP, conductivity/resistivity, salinity, and temperature. The series supports batch control applications via the DPU91-BC variant with optional module support.

Documented measurement types include:

Flow
pH/ORP
Conductivity/Resistivity
Salinity
Temperature
Pressure
Batch

Operating Conditions & Performance

The DPU91 Series operates with a DC power supply of 10.8 to 35.2 Vdc, regulated. The unit features an auto-sensing backlit LCD display with a 'dial-style' digital bar graph.

Performance specifications include:

Accuracy: ±0.5% or reading maximum error @ 25°C (77°F); 0.5% of reading (display)
Repeatability: ±0.2% of reading
Resolution: 1 µS
Update Rate: 1 second
Hysteresis: Adjustable: Absolute in engineering units (EUs)

Ambient operating temperature for the backlit LCD is -10 to 70°C (14 to 158°F). Storage temperature ranges from -15 to 70°C (5 to 158°F).

Configuration Options

The series offers configurable mounting and output options. The DPU91 is available in field-mount configurations, while the DPU91P supports panel mount applications.

Housing & Mounting:

Enclosure Rating: ¼ DIN, NEMA 4X/IP65
Housing Material: PBT
Dimensions (H x W x D): 99.06 mm (3.90 in) x 99.06 mm (3.90 in) x 91.44 mm (3.60 in)
Weight: 0.63 kg (1.63 lb)

Outputs & Connectivity:

Digital serial ASCII, TTL level, 9600 bps
4 to 20 mA (10.8 to 35.2 Vdc, 30 mA maximum)
Dry-Contact Relays: 2
Open Collector: 1
HART® Protocol: Available via DPU90-COMM module (superimposes digital signal onto 4 to 20 mA)

Sensor Compatibility & Accessories:

Flow Sensors: Compatible with FP-5100, FP-5200, FP-5300, FPB100, FMG3000 (field mount); Integral Mount FP-5600, FP-8500, FP-8500A; and FP-5061, FP-5070, FP-2540, FMG-550.
pH/ORP Sensors: Submersible Mounted PHE-2724, HE-2726, ORE-2725; In-Line Mounted PHE-2724, HE-2726, ORE-2725.
Conductivity/Resistivity/Salinity Sensors: CDCE-90 Series Sensors*.

The series supports optional modules including DPU90-R (programmable dual relay output), DPU90-COMM, and PC configuration tools. Mounting kits such as FP90UM (universal) and FP90IM (integral) are available for field mounted units.

Key Product Differences

The series distinguishes between panel mount and field mount configurations:

DPU91 / DPU91-BC: Field-mount display/transmitter. The -BC variant adds batch module support for batching control.
DPU91P: Panel mount display (¼ DIN). Note that panel mount displays cannot be mounted integrally to the sensor in configurations requiring integral mounting brackets.

Sensor installation fittings and specific modules are sold separately. The DPU90-AK angle adjustment kit is available for field mount and conductivity/resistivity/salinity input units.

PDFs & Manuals

DPU91-FLOW_spec DPU91-Series View More

View Less

Compliance