Page 1
pH/ORP Transmitters
ELECTRONICS
PHTX-271 Series
Starts at
$
550
Electronics
Only
⻬ Display Temperature in °C or °F
⻬ Hold and Simulate Functions
⻬ Integral or Remote Mounting
⻬ Open Collector or SPDT
Relay Output
⻬ 4 to 20 mA Output Standard
⻬ Dual Output Option Allows
Temperature and pH Signal
Transmission
⻬ 2 x 16 Character Dot Matrix LCD
⻬ Chemical Resistant Enclosure
and Self-Healing Window
⻬ Large Pushbuttons
⻬ Clearly Marked Terminal Labels
Applications:
⻬ Neutralization Systems
⻬ Heavy Metals Recovery
⻬ Plating Control
⻬ Scrubber Control
⻬ Environmental Study
⻬ Water Treatment
⻬ Water Quality Monitoring
⻬ Waste Treatment
⻬ Disinfecting
The PHTX-271 Series Transmitter is
designed for broad application and
ease of setup and use. The unit autoconfigures for either pH or ORP use
when connected to recommended
OMEGA
Multiple mounting options allow for
installation best suited to your
particular application. The
automated “easy-cal” menu features
automatic buffer recognition for
mistake proof pH or ORP sensor
calibrations. Two-line LCD provides
sensor diagnostic information for
ease in system maintenance.
®
pH or ORP sensors.
PHTX-271-2P, $655, shown larger than actual size.
Specifications
Accuracy: ±0.03 pH; ±2 mV ORP
pH Range: 0 to 14 pH
Temperature Range: -25 to 120°C
(-13 to 248°F); 3K Balco
ORP Range: -2000 to +2000 mV, isolated (10
kΩ ID resistance T+, T-)
Current Output: 4 to 20 mA, isolated, passive,
fully adjustable and reversible
Loop Impedance: 50 Ω max @ 12V;
325 Ω max @ 18V; 600 Ω max @ 24V
Update Rate: 0.5 sec
Accuracy: ±0.03 mA @ 25°C, 24V
Relay Output: Mechanical SPDT;
Hi, Lo, Pulse, Off
Maximum Voltage Rating: 5 A @ 30 Vdc
or 5 A @ 250 Vac, resistive
Hysteresis: User-adjustable,
400 pulses/min max
Open-Collector Output: Hi, Lo, Pulse, Off;
Type/Rating: Optically isolated, 50 mA max,
sink, 30 Vdc max pull-up voltage
Hysteresis: User-adjustable,
400 pulses/min max
Operating Ambient: -10 to 70°C
(14 to 158°F); 0 to 95% RH, non-condensing
Storage Temperature: -15 to 80°C
(5 to 176°F)
Display: Alphanumeric 2 x 16 LCD;
User selectable contrast, 5 levels
Enclosure Rating: NEMA 4X (IP65) front
Keypad: Sealed 4-key silicone rubber
Display Window: Polyurethane coated
polycarbonate
Power: 12 to 24 Vdc ±5%, regulated
Max Current: 21 mA max for PHTX-271-1,
220 mA max for PHTX-271-2, 60 mA max for
PHTX-271-3
Dimensions: 96 H x 96 W x 97 mm D
(3.780 x 3.780 x 3.819")
Panel Cutout: 92 mm
Shipping Weight: 0.6 kg (1.3 lb)
2
(3.622 in2)
D-X
For Sales
& Service
U.S.A. and Canada
Page 2
Panel Mount
omega.comomega.com
®
96 (3.8)
Universal Mount
96 (3.8)
Panel Output
92 x 92
+0.8, -0
3.6 x 3.6
(
+0.031, -0
96
(3.8)
)
106
(4.18)
82
(3.23)
Dimensions: mm (in)
96
(3.8)
41
(1.6 )
97
(3.8)
Optional
Rear Cover
56
(2.2)
All panel mount transmitters PHTX-271-XP include a mounting bracket and gasket for a NEMA-4X (IP65) watertight panel installation.
Panel mount transmitters fit into a standard 1⁄4 DIN panel cutout. The Universal Mount Kit FP90UM can be ordered separately and
includes a conduit base, locking ring, and universal adapter for mounting the transmitter on a pipe wall or other stationary surface.
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Model No. Price Description Mounting Output(s)
PHTX-271-1 $550 pH/ORP transmitter Field mount* Open collector output
PHTX-271-2 655 pH/ORP transmitter Field mount* Dual relays
PHTX-271-1P 550 pH/ORP transmitter Panel mount Open collector output
PHTX-271-2P 655 pH/ORP transmitter Panel mount Dual relays
Field mount transmitters require FP90UM universal mounting kit, $53.
*
Pre-Amplifier and Sensors
Model No. Price Description
PH-2720-PA $210 Pre-amplifier with 4.5 m (15') cable,
PHE-3271 285 Flat style pH electrode with ATC
PHE-3271-HF 365 Flat style pH electrode with ATC, HF resistant
PHE-2716 250 Bulb style pH electrode with ATC
PHE-2716-D1 295 Bulb style pH electrode with ATC, deionized water
ORE-2715 315 Flat style ORP sensor
ORE-2717 275 Bulb style ORP sensor
3
⁄
4
FNPT
Accessories
Model No. Price Description
FP90UM $53 Universal mounting kit
FP90-4X 48 NEMA 4X (IP65) rear cover (panel mount)
PH-31542-TC 13 Threaded cap for in-line installation 1
PHA-4 8
PHA-7 8
PHA-10 8
4.00 pH buffer solution 500 mL (1 pt) bottle
7.00 pH buffer solution 500 mL (1 pt) bottle
10.00 pH buffer solution 500 mL (1 pt) bottle
PSS-D12B 190 115 Vac to 12/24 Vdc, 240 mA power supply
Comes complete with operator’s manual.
Ordering Examples: PHTX-271-1P pH/ORP transmitter panel mount, PHE-3271 flat style pH electrode, PH-2720-PA pre-amplifier
with 4.5 m (15') cable, PHA-4 pH 4 buffer solution, PHA-7 pH 7 buffer solution, $550 + 285 + 210 + 8 + 8 = $1061.
PHTX-271-1 pH/ORP transmitter field mount, FP90UM universal mounting kit, PHE-3271 flat style pH electrode, PH-2720-PA pre-amplifier
with 4.5 m (15') cable, PHA-7 pH 7 buffer solution $550 + 53 + 285 + 210 + 8 = $1106.
1
⁄
4
NPT
Order Online
Over 100,000 Products Available!
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Page 3
Installation
Relay 1
Relay 2
ENTER
pH/ORP
10.20 pH
25.0°C
The transmitter is available in a panel mount or a field version.
Select the universal mount kit FP90UM to mount the transmitter on a surface near the sensor.
1. Panel Mount
PHTX-271-XP
All Panel mount transmitters
PHTX-271-XP include a mounting
bracket and gasket for a NEMA-4X
(IP65) watertight panel installation.
Panel mount transmitters fit into a
standard 1⁄4 DIN panel cutout.
2. Universal Mount
FP90UM
Kit
The Universal Mount Kit FP90UM can
be ordered separately and includes a
conduit base, locking ring, and universal
adaptor for mounting the transmitter on
a pipe, wall, or other stationary surface.
PHTX-271-X
PHTX-271-XP
pH/ORP Transmitter
includes:
mounting bracket
and panel gasket
Sensor w/ Preamp
pH/ORP Transmitter (PHTX-271)
Universal Adaptor Kit
(FP90UM) includes:
locking ring
conduit base
universal
adaptor
(for pipe,
wall)
Sensor w/ Preamp
D-X
For Sales
& Service
U.S.A. and Canada
Page 4
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