SureCell Cl2 – 3-Electrode Chlorine Sensor

Operating Principle: 3-electrode electrochemical
Gas Detected: Chlorine
Measurement Range: 0-20 ppm
Maximum Overload2: 50 ppm
Expected Operating Life: 2 years in air
Output Signal: 0.50+0.10^A per ppm
Temperature Range: Continuous: -20°C to +40°C
Intermittent: -40°C to +55°C
Pressure Range: 1 atm ±10%
Humidity Range (non-condensing): Continuous: 15 - 90% RH
Intermittent: 0 - 99%RH
Response Time (T5 90): <60 seconds
Baseline Offset (clean air): <±0.25ppm equivalent
Zero Shift (-40 to +55°C): <+0.5ppm equivalent
Long Term Output Drift: <2% per month
Repeatability: <+5%
Linearity: Linear <+3%
Recommended Load Resistor: 5Q
Bias Voltage: Not required

Maximum at 50ppm: 0.05mA
Maximum o/c Voltage: 0.8V
Maximum s/c Current: <1.0A

• 4-20mA Board For Surecell
• With SureCell Carbon Monoxide CO (M): range 0-1000 ppm
• With SureCell Hydrogen Sulphide H2S (L): range 0-200 ppm
• With SureCell Chlorine Cl2: range 0-20 ppm

Output signal: 4 - 20 mA using two-wire technology

Features

Electronic transmitter
designed to equivalent sensors
Measuring signal 4 - 20 mA
Calibration on required range

User benefits

Immediate use and evaluation of electrochemical SureCells
Standard interface
Equivalent to specification

Specification

Measuring principle: Electrochemical
Operation: continuous
Gas entry: by diffusion
Range: CO: calibratable up to 1000 ppm CO f.s.d.
H2S: calibratable up to 200 ppm H2S f.s.d.
Cl2: calibratable up to 20 ppm Cl2 f.s.d.
Repeatability: CO: < ± 3% of signal
H2S: < ± 3% of signal
Cl2: < ± 5% of signal
Response time:CO: t90 < 30 sec
H2S: t90<10sec
Cl2: t90 < 60 sec
Cross sensitivity: see equivalent sensor data sheet
Linearity: CO: < ± 5% of nominal value
H2S: < ± 5% of nominal value
Cl2: < ± 3% of nominal value
Temperature range: -20°C to +40°C
Humidity range (non ■condensing):15 - 90% r.H.
Operating voltage: 24 V± 10% d.c.
Output signal: 4-20 mA, two-wire; max. load 500 Q Ohms at 24 V d.c. (+/- 4V)
Zero adjustment: via potentiometer
Span adjustment: via potentiometer
RFI: according EN 50082
Storage conditions: + 10°C to +30 °C
Mechanical design: SureCell sensor plugged into transmitter and surrounded by installation ring
Dimensions: 40 mm 0, 55 mm high
Warranty period: 6 months from despatch date

Two wire screw terminal: The transmitter has a two wire screw terminal to connect a 24V d.c. power supply. There is no polarity requirement across the two screw terminals (i.e. there is no +/- logic). On the same two wires, you will receive the 4-20 mA signal output. The transmitter is precalibrated on:

With SureCell CO (M): 0-1000ppm CO range
With SureCell H2S (L): 0-200ppm H2S range
With SureCeii Cl2: 0-20ppm Cl2 range

When there is zero gas concentration, you will receive a 4mA signal. With the full concentration, you will receive a 20mA signal.

Potentiometer: This is used for adjusting the signal to the correct value if you apply a test gas concentration to the transmitter and it gives an incorrect signal.

Test pins: The two test pins allow for one man calibration. Please kindly note that the signal here is not 4-20 mA but 0.4 - 2.0 Volts.