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Signet 2750 DryLoc
*3-2750.090*
3-2750.090
Rev. N
10/16
2750-1, 2750-2
2750-3, 2750-4
2750-7
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pH/ORP Sensor Electronics
Description
Signet 2750 pH/ORP Sensor Electronics provide two-wire 4 to 20 mA loop output for
pH and ORP measurements, without the expense of local display and other luxuries
available in full-featured transmitters. Preamplifi cation is built-in, reducing system costs
while ensuring absolute signal integrity up to 305 m (1,000 ft).
These sophisticated fi eld-mount devices also provide digital (S
Sensor Electronics self-confi gure for pH or ORP operation via automatic recognition of
electrode type, and the DryLoc
for submersible and in-line installations.
NEMA 4X Junction Boxes are integral parts of the in-line versions (2750-1, 2750-2,
and 2750-7) and are available as accessories for the submersible versions (2750-3
and 2750-4). The optional EasyCal feature allows simple push-button calibration and
includes an LED for visual feedback.
Table of Contents
Warranty Information ...............................................................................2
Product Registration ................................................................................2
Safety Information ...................................................................................2
Chemical Compatibility ............................................................................2
Specifi cations .......................................................................................2-3
In-Line Installation Notes .........................................................................3
In-Line Dimensions ..................................................................................3
Mounting Position ....................................................................................4
In-Line Assembly ..................................................................................4-5
Submersible Installation .......................................................................5-6
4 to 20 mA Loop Wiring ...........................................................................7
Calibration ...............................................................................................7
Troubleshooting .......................................................................................8
Ordering Information................................................................................8
English
Deutsch
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electrode connector quickly forms a robust assembly
®
L) Wiring ..................................................................................6
3
Operating Instructions
L) output. The 2750
3
English
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Summary of Contents for GF Signet 2750-1
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Page 1: Table Of Contents
English ® Signet 2750 DryLoc pH/ORP Sensor Electronics *3-2750.090* 3-2750.090 Rev. N 10/16 Operating Instructions 2750-1, 2750-2 Description Signet 2750 pH/ORP Sensor Electronics provide two-wire 4 to 20 mA loop output for pH and ORP measurements, without the expense of local display and other luxuries available in full-featured transmitters. -
Page 2: Warranty Information
Service Form and goods must be or their vapor may lead to failure of the retaining returned to your local GF Sales offi ce or distributor. nut, ejection of the sensor and loss of the process Product returned without a Service Form may not be fl... -
Page 3: In-Line Installation Notes
Specifi cations In-Line Dimensions Current Output 94 mm pH ......... Fixed 4 to 20 mA, (3.7 in.) isolated, 0 to 14 pH (custom scaling available) ORP ........Fixed 4 to 20 mA, isolated, –1000 to 2000 mV (custom scaling 140 mm 229 mm available, –2000 to 2000 mV) 117 mm... -
Page 4: Mounting Position
Mounting Position Wet-Tap electrodes, 2724, 2734, and 2774 series electrodes 2764 series electrodes MUST be mounted upright. Mounting Angle using GF Signet Fittings. • Vertical (0°) position optimum. • DO NOT install within 30º of horizontal (Contact factory Avoid locations with air pockets and/or sediment (90° and 270°). -
Page 5: Submersible Installation
2750 In-Line Assembly NOTE: Keep the electrical interconnection between electrode and sensor electronics dry and clean at all times. Locking Ring 3. Unlock the ring on base of 2750 (The ring is unlocked when Unlocked the lines on the ring and body of the 2750 are not aligned.) The molded alignment LUBRICATE O-RINGS WITH A NON-PETROLEUM BASED, marks are enhanced... -
Page 6: Digital (S L) Wiring
2750-3, 2750-4 Submersible Installation Use standard installation The 8052-1 NPT Mount Junction box The 8050-1 Universal Mount junction hardware to connect the (or 8052-2 with EasyCal) connects box (or 8050-2 with EasyCal) submersible 2750-3 or to ¾ in. pipe or conduit and provides mounts fl... -
Page 7: To 20 Ma Loop Wiring
4 to 20 mA Loop Wiring • When the 2750 is powered with 12 to 24 VDC, the 4 to 20 mA loop output is automatically selected. • Remove approximately 10 mm (0.4 in.) of insulation and tin each conductor before inserting into connectors. •... -
Page 8: Troubleshooting
Troubleshooting LED and Output Condition Possible Causes Suggested Solutions Current Output: LED off, • No electrode installed. • Install electrode. current output is 3.6 mA • Bad/dirty contacts between • Check interconnection between electrode and 2750, L): Transmitter (8900 or Digital (S electrode and 2750.
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