UNISENSE H2S Hydrogen Sulfide Sensors User Guide

UNISENSE H2S Hydrogen Sulfide Sensors User Guide

Specifications for HYDROGEN SULFIDE SENSORS – H2S

Important! Test sensor upon receipt!

This sensor has been successfully tested prior to shipping, however some sensors suffer from rough transportation. Therefore, it is important that you test the sensor upon arrival.

Replacement of defective sensoRs

Unisense will replace the sensor if it does not meet the specifications below, provided that:

1. A test is performed upon receipt without breaking the seal (Note! No seal on MR-sensors for testing purposes)
2. The complaint is given to Unisense within two weeks from receipt of the equipment

Guaranteed lifetime

Unisons guarantees the hydrogen sulfide sensor a minimum lifetime of 3 months on condition of correct storage and use according to the manual.

individual sensoR calibRation is RequiRed

Our sensors are handmade and as the sensor signal relies on the exact geometry of the sensor tip (micrometer scale), some variation must be expected. Complete linearity cannot be expected in the high concentration range (more than 300 μM H2S). The H2S sensitivity decreases over time (not uniformly) no matter if the sensor is in use or stored.

SIGNAl Amplification

Unisense hydrogen sulfide sensors should be connected to a Unisons amplifier such as a Uncap series instrument or the Field Micro sensor MultiMate

standard hydrogen sulfide sensors are functioning correctly if (at Room temperature):

• The 90 % response time is within the specified range (see table below)
• The zero signal is less than 25 % of the signal in a 50 μM H2S calibration solution
• (see the table) and maximum 25 mV.

| H 2 S-10| H 2 S-25| H 2 S-50| H 2 S-100| H 2 S-200| H 2 S-500| H 2 S-N| H 2 S-NP| H 2 S-MR| H 2 S- 50LR| H 2 S- 100LR| H 2 S- 500LR| H 2 S- NPLR
---|---|---|---|---|---|---|---|---|---|---|---|---|---
90 %

response time (in sec.)

| <10| <10| <10| <15| <15| <20| <20| <20| <20| <10| <15| <20| <20
Zero- signal less than| 15 mV| 15 mV| 20 mV| 25 mV| 25 mV| 25 mV| 25 mV| 25 mV| 25 mV| 25 mV| 25 mV| 25 mV| 25 mV

• The sensor signal in pA is converted to an instrument signal in mV. The default setting of this Pre-Amp range is 1 pA = 1 mV. However, this can be changed by the user (see the instrument  manual).

1. Unpacking
   ● Remove the grey shock-absorbing plastic net and inspect the sensor visually. Leave the sensor in the protection tube for testing.

2. connect the sensor to the amplifier
   ● The amplifier is automatically set up correctly when used with these instruments: UniAmp series and Unisense in situ amplifiers.
   ● For other amplifiers, set the polarization manually to +85 mV
   NOTE! Incorrect polarization may destroy the sensor

3. Wait for the sensor to stabilize
   ● The signal will be very high right after the sensor is connected and will decrease over time.
   ● The period of decreasing signal will normally be at least 2 hours.
   ● Once the signal is stable, calibration can be performed
   
   A typical decrease in sensor signal over time for a sensor that has just been plugged in.

4. calibrate the sensor
   

5. Place the sensor in sulfide free water to obtain the zero calibration point.
   ● Prepare the sulfide solution according to the H2S calibration kit manual and inject the solution into the calibration cap.
   ● For alternative calibration method, see the H2S Microsensor manual.

6. approve the sensor
   ● Compare the calibration points to the specifications given on the previous page. If necessary, see Troubleshooting in the H2S Microsens or manual or contact support (see below).

7. storage
   ● When not in use, store the sensor with the protection tube mounted at 5-35°C. Store the sensor in low light or darkness.

Useful tools

For support go to
www.unisense.com/support or
contact [email protected]

Get the full manuals for all sensors, equipment & software at www.unisense.com/manuals

H2S Micro sensor Manual|
Calkit-H2S Manual|
Sensor Trace Suite Manual|
Find SDS for Calibration Kit here
---|---|---|---

Unisense A/S
[email protected]
www.unisense.com
Phone: +45 89 44 95 00
Fax: +45 89 44 95 49

#### References

  * [ Manuals - Unisense](http://unisense.com/manuals "Manuals - Unisense")
  * [ Microsensors, instruments, and meters for microscale measurements](http://www.unisense.com "Microsensors, instruments, and meters for microscale measurements")

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