The DPU91 transmitter provides a
single channel interface for many
different parameters including flow,
salinity and temperature. The
DPU91-BC transmitter has the
added capability of supporting the
batch module for batching control.
The extra-large (3.90 x 3.90")
autosensing backlit display can
be viewed at 4 to 5 times the
distance over traditional transmitters.
The highly illuminated display and
large characters reduce the risk of
misreading or misinterpreting the
displayed values. The display shows
separate lines for units, main and
secondary measurements as well
as a “dial-style” digital bar graph.
The DPU91 is offered in both panel
or field-mount versions. Both
configurations can run on 12 to
32 Vdc power (24 Vdc nominal)and have 4 to 20 mA outputs.
Designed for complete flexibility,
plug-in modules allow the unit to
easily adapt to meet changing
customer needs. Optional modules
include relay, direct conductivity/
resistivity, batch and a PC
communications configuration tool.
The unit can be used with default
values for quick and easy
programming or can be customized
with labeling, adjustable minimum
and maximum dial settings, and unit
and decimal measurement choices.
Specifications General Input Channels: 1 Input Types: Digital serial ASCII, TTL level, 9600 bps Frequency Range: 0.5 to 1500 Hz Accuracy: 0.5% of reading (display) Measurement Types: Flow, pH/ORP, conductivity/resistivity, salinity, pressure, temperature or batch Enclosure and Display Case Material: PBT Window: Shatter-resistant glass Keypad: 4 buttons, injection-molded silicone rubber seal Display: Backlit, 7 and 14-segment Update Rate: 1 second LCD Contrast: 5 settings Indicators: “Dial-style” digital bar graph, LEDs for open collector, relays and warning indicator Enclosure: ¼ DIN, NEMA 4X/IP65 Mounting Panel: ¼ DIN, ribbed on four sides for panel mounting clip inside panel, silicon gasket (included) Field Mounts: Specified to Omega® field mount junction boxes Weight: 0.63 kg (1.38 lb) Display Ranges
For PH/ORP version visit omega.com/dpu91_ph For flow version visit omega.com/ dpu91_flow Conductivity: 0.0000 to 99999 µS, mS, PPM and PPB (TDS), kΩ, MΩ Conductivity Temperature: -99 to 350°C (-146 to 662°F) Temperature: -99 to 350°C (-146 to 662°F) Salinity: 0 to 100 PPT Environmental Ambient Operating Temperature: Backlit LCD: -10 to 70°C (14 to 158°F) Storage Temperature: -15 to 70°C (5 to 158°F) Relative Humidity: 0 to 100% condensing for field mount; 0 to 95% non-condensing for panel mount Maximum Altitude: 4000 m (13,123') Electrical Requirements Power to Sensors: Voltage: 4.9 to 5.5 Vdc @ 25°C, regulated short circuit protected Terminal Blocks: Pluggable screw type 14 AWG maximum wire gauge Input Power DC: 10.8 to 35.2 Vdc, regulated
Current Output: 4 to 20 mA (10.8 to 35.2 VDC, 30 mA max) Open Collector:1 Overvoltage Protection: 48 V transient protection device current limiting for circuit protection and reverse-voltage protection Relay Specifications (DPU91-R) Dry-Contact Relay: Type: SPDT, Form C 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 Input Types Digital or AC Frequency: pH/ORP input via the digital output from the PHTX-2750 pH/ORP sensor electronics for pH/ORP models visit omega.com/ dpu91_ph. For flow models visit omega.com/dpu91_flow Raw Conductivity/Resistivity: Input directly from signet conductivity/ resistivity electrodes via direct conductivity/resistivity module or via CDTX-2850 Input Specifications 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 Accuracy: ± 0.5% or reading maximum error @ 25°C (77°F) Resolution: 1 µS Repeatability: ±0.2% of reading
† All amounts shown in EUR, GBP, or USD Note: Comes complete with operator’s manual.
Sensors and mounting kits sold separately.
The DPU90-C is required for use with conductivity measurement. The DPU90-C is sold separately.