GF Signet 2850 Conductivity-Resistivity Sensor Electronics and Integral System - Manual

Signet 2850 Conductivity/Resistivity Sensor Electronics English
1. Description
• Signet 2850 Conductivity/Resistivity Sensor Electronics provides either a two-wire 4 to 20 mA output or Digital (S 3 L) format.
• The 4 to 20 mA output models provide eight ranges for each electrode cell constant, plus the ability to invert each range.
• The EasyCal feature allows the devices to automatically recognize standard conductivity test solution values for simple fi eld calibration.
• The Conductivity sensor provided with integral systems will have its custom cell constant information programmed into the electronics
at the factory to provide a 1% sensor accuracy. See Section 8 for details.
SAFETY PRECAUTIONS
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.
2. Specifi cations
General
Compatible Electrodes:
Any Signet Conductivity/
Resisitivity electrode
(2818-2823, 2839-2842)
Temperature Compensation: PT-1000 RTD (2% per °C)
Pure Water Compensation:
Auto-switching when using
0.01 cell and raw conductivity
value < 0.5 μS
EasyCal:
Automatic recognition of the following conductivity values:
• 146.93 μS, 1408.8 μS, 12856 μS (@ 25 °C)
(Test solutions per ASTM D1125-95)
• 10 μS, 100 μS, 200 μS, 500 μS, 1000 μS, 5000 μS, 10,000 μS,
50,000 μS, 100,000 μS (@ 25 °C)
Electrical
Power:
12 to 24 VDC (4 to 20 mA output)
5 VDC ±5% regulated, 3.0 mA
max. for Digital (S
3 L) output
(Reverse polarity and short circuit
protected)
Digital (S 3 L) Output: Serial ASCII, TTL level 9600 bps
• Accuracy: Conductivity: ±2% of reading
Temperature: ±0.5 °C
• Resolution: Conductivity: 0.1% of reading
Temperature: < 0.2 °C
• Update Rate: Single input models: < 600 ms
Dual input models: < 1.2 s
Current Output:
• Field-selectable ranges
• Factory set span:
0.01 cell (2818, 2819, 2839): 4 to 20 mA = 0 to 100 μS
0.10 cell (2820, 2840):
4 to 20 mA = 0 to 1000 μS
1.0 cell (2821, 2841): 4 to 20 mA = 0 to 10,000 μS
10.0 cell (2822, 2842): 4 to 20 mA = 0 to 200,000 μS
20.0 cell (2823): 4 to 20 mA = 0 to 400,000 μS
• Max. Loop Resistance: 50 Ω @ 12 VDC
325 Ω @ 18 VDC
600 Ω @ 24 VDC
• Accuracy: ±2% of output span
• Resolution: 7 μA
• Update Rate: <600 ms
• Error Indication: 22 mA
Available data via Digital (S 3 L) Output:
• Raw conductivity
• Calibrated conductivity
• Calibrated temperature-compensated conductivity
• Temp. Error Indication:
Open input and out-of-range
diagnostics for temperature or
internal electronic error.
Environmental
Material: PBT
Enclosure Rating:
NEMA 4X/IP65
Operating Temperature: -10 to 85 °C (14 to 185 °F)
Storage Temperature: -20 to 85 °C (-4 to 185 °F)
Relative Humidity: 0 to 95%, non-condensing
Shipping Weight: 0.75 kg (1.75 lb.)
Standards and Approvals
• CE
• Manufactured under ISO 9001 and ISO 14001
3-2850.090-1 Rev. H 06/12 English
*3-2850.090-1*
Contents
1. Description
2. Specifi cations
3. In-Line
Installation
4. Submersible Installation
5. Wiring 4 to 20 mA Output version
6. Wiring Digital (S
3 L) Output version
7. Wiring Dual Input Digital (S 3 L) Output version
8. Cell Constant Selection
9. Range Selection for 4 to 20 mA Output
10. Calibration
11. Maintenance
12. Ordering Information
China RoHS (Go to www.gfsignet.com for details)