Page 1
MULTI-PARAMETER
INPUT TRANSMITTER
For pH/ORP
DPU91-pH/ORP
Series
U Large Auto-Sensing
Backlit Display
U “Dial-Style” Digital
Bar Graph
U Intuitive and “User-
Friendly” Interface
U Optional Field
Upgradable Relays
U Warning LED
Indicator
U Custom 13-Character
Label Capabilities
U Factory Reset
Capability
The DPU91 transmitter provides a
single channel interface for many
different parameters including flow,
pH/ORP, conductivity/resistivity,
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).
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.
DPU91 shown smaller
than actual size.
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)
F-1
F
Display Ranges
For flow version visit omega.com/dpu91_flow
For conductivity/resistivity version visit
omega.com/dpu91_conductivity
pH: 0.00 to 15.00
pH Temperature: -99 to 350°C
(-146 to 662°F)
ORP: -1999 to 1999.9 mV
Temperature: -99 to 350°C
(-146 to 662°F)
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% noncondensing 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
DPU91 without Relay Module:
200 mA @ 10.8 to 35.2 Vdc
Page 2
DPU91 with Relay Module: 300 mA
24.13
(0.95)
88.90
(3.50)
44.45
(1.75)
3.50
3.50
88.90
(3.50)
88.90
(3.50)
25°
44.58
(1.77)
107
(4.21)
Ref.
31.75
(1.25)
70.1
(2.76)
56.6
102.1
(4.02)
¾" ISO or
¾ FNPT
Threads
@ 10.8 to 35.2 Vdc
Overvoltage Protection: 48 V
transient protection device current
limiting for circuit protection and
reverse-voltage protection
Current Output: 4 to 20 mA
(10.8 to 35.2 Vdc, 30 mA maximum)
Relay Specifications
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
Input Types
Digital or AC Frequency: pH/ORP
input via the digital output from the
PHTX-2750 pH/ORP sensor electronics
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
For conductivity/resistivity models visit
omega.com/dpu91_conductivity
Input Specifications
Digital Serial: ACSII, TTL level,
9600 bps
PHE-2724
sensor
Both models
shown smaller
than actual size.
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 (º77F)
Resolution: 1 µS
Repeatability: ±0.2% of reading
PHE-2726
sensor
DPU91 Series with Mating pH/ORP Sensors
DPU91 DPU91P
Submersible Mounted
PHE-2724, PHE-2726,
ORE-2725
FP90UM, PHEH-275G
DPU90-AK (optional)
In-Line Mounted
PHE-2724, PHE-2726,
ORE-2725
* Sensor installation fitting information can be found at omega.com/fp_fittings.
*Sensor installation fitting,
DPU90-AK (optional)
PHEH-275Y,
PHEH-275G
Panel mount displays
cannot be mounted
integrally to the sensor
99.06
(3.90)
DPU91P
99.06
(3.90)
54.10
(2.13)
29.97
(1.18)
8.13
(0.32)
91.44
(3.60)
½" FNPT
Dimensions: mm (inch)
F-2
PHEH-275Y
94
(3.7)
140
(5.5)
31.75
(1.25)
70.1
(2.76)
PHEH-275G
56.6
(2.23)
¾" ISO or
¾ FNPT
Threads
102.1
(4.02)
Page 3
To Order
Model No. Description
DPU91
DPU91P
PHE-2724
PHE-2726
ORE-2725
PHEH-275Y
PHEH-275G
DC powered field mount multi-parameter display and transmitter
DC powered panel mount multi-parameter display and transmitter
Flat surface pH electrode,
Bulb style pH electrode,
Flat surface ORP electrode,
In-line sensor fitting
Submersible sensor fitting
3
⁄4 MNPT thread
3
⁄4 MNPT thread
3
⁄4 MNPT thread
DPU90-COMM
DPU90-AK
DPU90-R
Accessories
Model No. Description
DPU90-R
DPU90-COMM
DPU90-AK
DPU90-CT
FP90UM
FPM-5000-LTCK
PHA-4
PHA-4-GAL
PHA-7
PHA-7-GAL
PHA-10
PHA-10-GAL
PHA-DI
PHA-DI-GAL
PHAB-DI
PHAB-PH
Comes complete with operator’s manual (sensors and mounting kits sold separately).
Ordering Examples: DPU91, display/transmitter, PHEH-275G submersible mounting fitting, and FP90UM universal mounting kit for display.
DPU91P, panel mount display/transmitter, PHEH-275Y in-line mounting and electronics kit, and FP-5310 PVC in-line mounting tee 2".
Programmable dual relay output module, SPDT form C, 5 A resistive load
Communications module, HART
®
protocol super imposes digital signal onto of 4 to 20 mA
Angle adjustment kit for field mount and conductivity/resistivity/salinity input units
PC configuration tool, includes software
Universal mounting bracket for remote mounted display
Liquid tight connector kit for liquid tight wiring feed-thru
4.00 pH buffer solution 500 mL (1 pint) bottle
4.00 pH buffer solution 4 L (1 gal) bottle
7.00 pH buffer solution 500 mL (1 pint) bottle
7.00 pH buffer solution 4 L (1 gal) bottle
10.00 pH buffer solution 500 mL (1 pint) bottle
10.00 pH buffer solution 4 L (1 gal) bottle
Deionized water 500 mL (1 pint) bottle
Deionized water 4 L (1 gal) bottle
20 single use deionized water packets
5 each 4, 7 and 10 buffer packs with 5 deionized water packs
F-3
F
Loading...