3. If using a 6051010 or Quatro cable, you must have a sensor installed in port 1 for port 2 to operate.
Additionally, ensure that the sensor installed in port 1 is in good working order. In 6051010 and Quatro
cables, the sensors installed in port 1 and
port 2 use the reference from the sensor installed in port 1 only.
Therefore, if the sensor installed in port 1 is not working properly, the readings from the sensor installed in
port 2 will be erroneous as well.
4. If you continue to get error messages during calibration, clean the sensor.
5. If you continue to get error messages during calibration, soak the sensor in 100 mg/L ammonium standard
for several hours or overnight.
6. If you suspect port contamination, follow the instructions in the Cleaning a Sensor Port section.
7. If you continue to have trouble calibrating the ammonium sensor, contact your local YSI Representative or a
YSI Authorized Service Center.
Cleaning the Ammonium Sensor
The ammonium sensor uses a PVC membrane. As always, when handling a sensor, care should be taken to
avoid damaging the membrane. After extensive use, the membranes may become coated with a deposit or
scoured with fine scratches which may cause a slow or reduced response (low slope) or unstable readings.
Deposits may be removed with a fine jet of deionized water or rinsing in alcohol followed by soaking in 100 mg/L
ammonium calibration standard.
The sensor may require soaking in the high ammonium calibration solution to recover its performance. Soak in
100 mg/L for several hours or overnight.
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