2
2750 DryLoc pH/ORP Sensor Electronics
Caution / Warning / Danger
Indicates a potential hazard. Failure to follow all warnings
may lead to equipment damage, injury, or death
Personal Protective Equipment (PPE)
Always utilize the most appropriate PPE during
installation and service of Signet products.
Pressurized System Warning
Sensor may be under pressure, take caution to vent
system prior to installation or removal. Failure to do so
may result in equipment damage and/or serious injury.
Hand Tighten Only
Overtightening may permanently damage product threads
and lead to failure of the retaining nut.
Do Not Use Tools
Use of tool(s) may damage product beyond repair and
potentially void product warranty.
Note / Technical Notes
Highlights additional information or detailed procedure.
Safety Information
Refer to your local Georg Fischer Sales of
fi
ce for the most
current warranty statement.
All warranty and non-warranty repairs being returned must
include a fully completed Service Form and goods must be
returned to your local GF Sales of
fi
ce or distributor.
Product returned without a Service Form may not be
warranty replaced or repaired.
Signet products with limited shelf-life (e.g. pH, ORP, chlorine
electrodes, calibration solutions; e.g. pH buffers, turbidity
standards or other solutions) are warranted out of box but not
warranted against any damage, due to process or application
failures (e.g. high temperature, chemical poisoning, dry-out) or
mishandling (e.g. broken glass, damaged membrane, freezing
and/or extreme temperatures).
Thank you for purchasing the Signet line of Georg Fischer
measurement products.
If you would like to register your product(s), you can now register
online in one of the following ways:
•
Visit our website
www.gfsignet.com.
Under
Service and
Support
click on
Product Registration Form
• If this is a pdf manual (digital copy),
click here
General
Compatible Electrodes ......... Signet DryLoc Electrodes
(PT1000 or 3K Balco temperature
sensor versions for pH)
Operational Range 2750 ...... 0.00 to 14.00 pH, ±2000 mV ORP,
0 °C to 85 °C (32 °F to 185 °F)
Response Time (includes electrode response):
pH ..................................... <6 s for 95% of change
ORP
.................................. application
dependent
pH Temp T90 ................... 200 s (2724 and 2734)
132 s (2726 and 2736)
438 s (2756-WT)
Materials
In-line:
2750-1, 2750-2, 2750-7..... PBT (thermal plastic polyester)
Submersible:
2750-3,
2750-4
.................. CPVC
Cable for 2750-3, 2750-4, 2750-7:
•
5 m (15 ft) 3-conductor shielded, 22 AWG
•
May be extended up to 305 m (1000 ft) with current output
• May be extended up to 305 m (1000 ft) with (S
3
L) output
Shipping Weight
2750-1, 2750-2 ...................... 0.75 kg (1.75 lb)
2750-3, 2750-4, 2750-7 ........ 0.64 kg (1.4 lb)
Environmental
Ambient Temp. ..................... 0 °C to 85 °C (32 °F to 185 °F)
Storage Temp. ..................... -20 °C to 85 °C (-4 °F to 185 °F)
Relative Humidity ................. 95% max, non-condensing
Immunity ............................... EN50082-2
Emissions ............................. EN50081-1
Enclosure Rating
In-line:
2750-1,
2750-2, 2750-7 .... NEMA 4X/IP65
(with electrode connected)
Submersible:
2750-3,
2750-4
.................
NEMA 6P/IP68
(with electrode and watertight
extension pipe connected)
Electrical
Input Impedance .................. >10
11
Ω
Input response time ............. 500 ms
Temperature drift.................. ±0.002 pH per ºC,
±0.1 mV ORP per ºC
Input resolution ..................... 0.02 pH, 1 mV ORP, 0.3 ºC
Specifi cations
Chemical Compatibility
Warranty Information
Product Registration
1. Depressurize and vent system prior to installation or removal.
2. Con
fi
rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure speci
fi
cations.
4. Wear safety goggles or faceshield during installation/service.
5. Do not alter product construction.
6. When using chemicals or solvents care should be taken
and appropriate eye, face, hand, body, and/or respiratory
protection should be used.
The retaining nuts of pH and ORP sensors are not designed
for prolonged contact with aggressive substances.
Strong acids, caustic substances and solvents
or their vapor may lead to failure of the retaining
nut, ejection of the sensor and loss of the process
fl
uid with possibly serious consequences, such as
damage to equipment and serious personal injury.
Retaining nuts that may have been in contact with
such substances e.g. due to leakage or spilling,
must be replaced.
