GF Signet 2750 DryLoc pH_ORP Sensor Electronics - Manual

Signet 2750 DryLoc ® pH/ORP Sensor Electronics
2. Specifi cations
General
•
Compatible Electrodes: Signet DryLoc Electrodes.
(PT1000 temperature sensor versions for pH)
• Operational Range: 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)
132 s (2726)
438 s (2756-WT)
Materials:
2750-1, -2 (in-line):
PBT (thermal plastic polyester)
2750-3, -4 (submersible): CPVC
Cable for -3, -4 submersible versions:
5 m (15 ft) 3-conductor shielded, 22 AWG
• May be extended up to 3.48 m (100 ft) with current output
• May be extended up to 3.48 m (100 ft) with (S
3 L) output
Weight:
2750-1, -2 (in-line):
0.75 kg (1.75 lb)
2750-3, -4 (submersible): 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:
2750-1, -2 (in-line):
NEMA 4X/IP65 (with electrode connected)
2750-3, -4 (submersible): 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
SAFETY INSTRUCTIONS
1. Depressurize and vent system prior to installation or removal.
2. Confi rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifi 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.
1. Description
Signet 2750 pH/ORP Sensor Electronics provide two-wire 4 to 20mA 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 feet.
These sophisticated fi eld-mount devices also provide the Digital (S 3 L) output; the latest development in leading-edge technology from
Signet. The 2750 Sensor Electronics self-confi gure for pH or ORP operation via automatic recognition of electrode type, and the DryLoc
electrode connector quickly forms a robust assembly for submersible and in-line installations.
NEMA 4X Junction Boxes are integral parts of the in-line version and are available as accessories for the submersible version. The
optional EasyCal feature allows simple push-button calibration and includes an LED for visual feedback.
1. Description
2. Specifi cations
3. In-line Installation
4. 2750 In-line Assembly
5. Submersible Installation
6. Digital (S
3 L) wiring
7. 4 to 20 mA Loop wiring
8. Calibration
9. Troubleshooting
10. Ordering Information
*3-2750.090*
3-2750.090 Rev. K 01/13 English
English
Current output:
• Description:
pH: Fixed 4 to 20 mA, isolated,
0 to 14 pH (custom scaling available)
ORP: Fixed 4 to 20 mA, isolated,
–1000 to 2000 mV (custom scaling
available, –2000 to 2000 mV)
• Power: Regulated 12-24 VDC ± 10%,
20 mA max.
• Max Loop Resistance: 50 Ω max. @ 12V
325 Ω max. @ 18V
600 Ω max. @ 24V
• Accuracy: ±32 μA @ 25 ºC
• Temperature drift: ±1 μA per ºC
• Output resolution: ± 5 μA
• Error indication: 3.6 mA
Digital (S 3 L) output:
• Description: Serial ASCII, TTL level 9600 bps
• Power: 5 VDC ± 10% regulated, 3 mA max
• Accuracy:
pH: ± 0.03 pH @ 25 °C
ORP: ± 2 mV @ 25 °C
• Resolution: pH: 0.01 pH
ORP: 1 mV
Temp. 0.2 °C
• Error indication: Temp output "+999.9"
Standards and Approvals
• CE
• Manufactured under ISO 9001 for Quality, ISO 14001 for
Environmental Management and OHSAS 18001 for Occupational
Health and Safety.
China RoHS (Go to www.gfsignet.com for details)
Declaration of Conformity according to FCC Part 15
This device complies with Part 15 of the FCC rules. Operation is
subject to the following two conditions:
(1) This device may not cause harmful interference, and,
(2) This device must accept any interference received,
including interference that may cause undesired operation.