Schmersal, Inc.
Schmersal is a leader in the design and manufacturing of quality dependable controls for machine ……...
The DPU91 transmitter provides a single channel interface for various types of parameters, including flow, conductivity/resistivity, pH/ORP, temperature, and salinity. The DPU91-BC transmitter has the additional capability to support the batch module for batching control.
The DPU91 transmitter has the extra-large (3.90 x 3.90") autosensing backlit display that can be viewed at 4 to 5 times the distance compared to conventional transmitters. The well-illuminated display and large characters lower the risk of misinterpreting or misreading the displayed values.
Separate lines for main, units, secondary measurements, and “dial-style” digital bar graph are shown in the display. The DPU91 transmitter is available in field or panel-mount versions, and both of these configurations can operate on 12 to 32 VDC power (24 VDC nominal) and provide 4 to 20 mA outputs.
Designed for full flexibility, plug-in modules enable the unit to easily adapt to varying needs of customers. Batch, relay, direct conductivity/resistivity, and a PC communications configuration tool are available as optional modules. The unit can be used together with default values for easy and fast programming or can be modified with adjustable minimum and maximum dial settings, labeling, unit and decimal measurement options.
Intuitive and “user-friendly” interface
“Dial-Style” digital bar graph
Large auto-sensing backlit display
Warning LED indicator
Custom 13-character label capabilities
Factory reset capability
Optional field upgradable relays
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), kO, MO
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
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