Signet 8750 pH/ORP Transmitters
Member of the ProcessPro® Family of Instruments
Panel Mount Pipe, Tank, Wall Mount
Description
The Signet 8750 pH/ORP Transmitter
is designed for broad application and
ease of setup and use. The unit autoconfigures for either pH or ORP use
when connected to Signet pH or ORP
electrodes. Choice of mounting options
allow users to customize their installation for particular applications.
System Overview
In-Line Sensor Installation
Panel Mount
Signet 8750
pH/ORPInstrument
Pipe, Tank, Wall Mount
Signet 8750
pH/ORP
Instrument
The EasyCal menu features automatic
buffer recognition for mistake-proof
pH or ORP electrode calibrations.
Intuitive software and the four button
keypad arrangement make it easy to
access important information such as
pH or ORP, mV input, temperature,
calibration, relay set-up menus and
more.
Submersible Sensor
Installation
Panel, Pipe, Tank, Wall Mount
Features
• Automatic temperature compensation
• Temperature display
in °C or °F
• Hold and simulate
functions
• Relay options available
• Output scalability
• Optional dual output
• NEMA 4X/IP65
enclosure with selfhealing window
• EasyCal option
available
Applications
• Neutralization
Systems
• Heavy Metals
Recovery
• Plating Control
• Scrubber Control
• Pool and Spa Control
• Environmental Study
• Water Treatment
• Water Quality
Monitoring
• Waste Treatment
• Disinfection
Signet
Universal Adapter Kit
(3-8050) (sold separately)
Signet 2720 and 2760
Preamplifier
(sold separately)
Signet
pH/ORP electrode
(sold separately)
2714 2754 2764 2774
2715 2755 2765 2775
2716 2756 2766 2776
2717 2757 2767 2777
Signet Fittings* (sold separately)
or customer supplied fittings
(see individual electrode sheets for more info.)
108
Signet 8750 pH/ORP Instrument
Pipe extension
or conduit with
3/4 in. NPT or
ISO 7/1-R 3/4
threads
Signet 2720 and
2760 Preamplifier
(sold separately)
Signet
pH/ORP electrode
(sold separately)
2714 2754 2764 2774
2715 2755 2765 2775
2716 2756 2766 2776
2717 2757 2767 2777
C
US
E171559
* See Fittings Section for
more information
www.gfsignet.com
Dimensions
3-8750-XP Panel Mount
96 mm
(3.8 in.)
96 mm
(3.8 in.)
Optional
Splashproof
Rear
Cover
)
56 mm
(2.2 in.)
97 mm
(3.8 in.)
64 mm
(2.5 in.)
41 mm
(1.6 in.
Field version with Universal
Mounting Kit
42 mm
(1.7 in.)
106 mm (4.2 in.)
Model 8750
Ordering Information:
1) For panel version, cutout
should be 92 x 92 mm
(3.62 x 3.62 in.)
2) To mount the panel version on a wall, use the
heavy duty wall mount
bracket.
3) An optional splashproof
rear cover can be ordered
separately if needed panel mount version only.
4) Use the universal mounting kit with the field
mount instrument to
mount to a pipe, tank or
wall.
5) Order RC filter kits to protect relays from voltage
spikes.
Please refer to
Wiring, Installation,
and Accessories
sections for more
information.
www.gfsignet.com
92 mm
(3.6 in.)
82 mm
(3.23 in.)
Specifications
General
Accuracy: ±0.03 pH, ±2 mV ORP
Display:
Alphanumeric 2 x 16 LCD
Contrast: User selectable, 5 levels
Material
• Case: PBT
• Panel case gasket: Neoprene
• Window: Polyurethane coated polycarbonate
• Keypad: Sealed 4-key silicone rubber
Electrical
Power:
12 to 24 VDC ±10% regulated
• (-1) 21 mA max.
• (-2) 220 mA max.
• (-3) 60mA max.
Electrode input range:
• pH: 0 to 14 pH
• Temp.: 3K Balco, -25°C to 120°C
(-13°F to 248°F)
• ORP: -2000 to +2000 mV, isolated
(10KΩ I.D. resistance T+, T-)
Current output:
• 4 to 20 mA, isolated, passive, fully adjustable and reversible
• Max. loop impedance:
50Ω max. @ 12 V
325Ω max. @ 18 V
600Ω max. @ 24 V
• Update rate: 0.5 seconds
• Accuracy: ±0.03 mA @ 25°C, 24 V
Ordering Information
Part Number
3-8750 pH/ORP Transmitter
Input(s), Outputs, and Power - Choose one
-1 One input with 4 to 20 mA output and one open collector; uses 2 wire power
-2 One input with 4 to 20 mA output and two relays; uses 4 wire power
-3 One input with two 4 to 20 mA outputs and 2 open collectors; uses 4 wire power
Field or panel mount - Choose one
- Field mount for pipe, wall, or tank mounting
P Panel mount; including mounting bracket and panel gasket
3-8750 -1 P Example Part Number
Mfr. Part No. Code
3-8750-1 159 000 053
3-8750-1P 159 000 054
3-8750-2 159 000 055
Accessories and Replacement Parts
Mfr. Part No. Code Description
Mounting
3-8050 159 000 184 Universal mounting kit
3-8050.392 159 000 640 Model 200 retrofit adapter
3-8050.395 159 000 186 Splashproof rear cover
3-0000.596 159 000 641 Heavy duty wall mount bracket (for panel mount only)
3-5000.598 198 840 225 Surface Mount Bracket
Liquid tight connectors
3-9000.392 159 000 368 Liquid tight connector kit for rear cover (3 connectors)
3-9000.392-1 159 000 839 Liquid tight connector kit, NPT (1 piece)
3-9000.392-2 159 000 841 Liquid tight connector kit, PG13.5 (1 piece)
Other
3-8050.396 159 000 617 RC Filter kit (for relay use), 2 per kit
3-0700.390 198 864 403 pH buffer kit
Electrical (continued)
Relay output:
• Mechanical SPDT contacts:
Hi, Lo, Pulse, Off
• Maximum voltage rating:
5 A @ 30 VDC, or 5 A @ 250 VAC
resistive load
• Hysteresis: User-adjustable
Max 400 pulses/min.
Open-collector output: Hi, Lo, Pulse, Off
• Open-collector, optically isolated,
50 mA max, sink, 30 VDC max. pull-
up voltage.
• Hysteresis: User-adjustable
Max. 400 pulses/min.
Environmental
Enclosure rating: NEMA 4X/IP65 front
Operating temperature:
-10°C to 70°C (14°F to 158°F)
Storage temperature:
-15°C to 80°C (5°F to 176°F)
Relative humidity:
0 to 95%, non-condensing
Shipping Weight: 0.6 kg (1.3 lb.)
Standards and Approvals
• CE, UL listed
• Manufactured under ISO 9001:2000
for Quality and ISO 14001:2004 for
Environmental Management
Mfr. Part No. Code
3-8750-2P 159 000 056
3-8750-3 159 000 057
3-8750-3P 159 000 058
109
Choosing
Products
Instrument
Multi-Pa-
rameter
Flow
pH/ORP
Conductivity/
Resistivity
Pressure, Level
Temperature,
Products
Other
Installation
Wiring &
Reference
Technical
Temperature/
Pressure
Graphs
of Terms
Glossary
Reference
Part No.
Index
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