Hach TPM870 User Manual page 19

1.4.3 Turbidimeter
1. Calibrate the turbidimeter as described in its user's manual.
2. Calibrate the turbidimeter analogue output
First select the minimum and maximum values:
Minimum value: 0.0000 RMn
Press key SETUP of the turbidimeter, display Mode = 14 using the
EDIT keys then press ENTER. Move the decimal point to the right
place using the right arrow key. Press ENTER twice then press
SETUP.
Maximum value: 20.0 RMx
Press key SETUP of the turbidimeter, display Mode = 15 using the
EDIT keys then press ENTER. Display 20.0 using the right arrow
key, press ENTER twice then press SETUP.
Calibration of the turbidimeter analogue output:
The turbidimeter outputs 1000 mV full scale and the TPM870 multiply
by 2 this value. Therefore, the calibration is performed from the
TPM870 and the "Measure" method of the TIM8xx, TIM9xx or
IONxxx workstation used. Connect the instruments as shown on
paragraph 1.3 and switch them on. On the workstation, select the
"Measure" method, call the Electrode window and press 2 to install
the electrode. Back in the Electrode window, press 5 to display the
mV measurement. For more information, refer to the workstation
short form reminders, part no. D21T047, D21T070, D21M070 or
D21M076.
Adjusting the zero of the analogue output
Press key SETUP of the turbidimeter, display Mode = 16 using the
EDIT keys then press ENTER. Use the turbidimeter up and down
arrow keys in order to read a measured value of 0.0 ± 2.0 mV on
the workstation display. Then, press key ENTER to confirm and
SETUP to quit.
Adjusting the maximum value of the analogue output
Press key SETUP of the turbidimeter, display Mode = 17 using the
EDIT keys then press ENTER. Use the turbidimeter up and down
arrow keys in order to read a measured value of 2000 ± 2 mV on
the workstation display. Then, press key ENTER to confirm and
SETUP to quit.
TPM870 19