Aquametrix SHARK-120/240 Controllers User Manual User Manual

Page 46

pH - Outputs Menu - 4-20mA CH2 Output 4.22

Page 44

MULTI-PARAMETER CONTROLLER & ANALYZER USER’S MANUAL

pH - Outputs Menu - 4-20mA CH2 Output 4.22

DOWN

Or press the
key to highlight
the Y character

NOTE

PRESS THE AND KEYS

TOGETHER TO GO IMMEDIATELY BACK TO

RUN MODE

DOWN

Then press the key to store the
selection and return to the OUTPUTS
menu

Stored

The example below shows the 4-20 mA set to 4mA = 0°C and 20mA = 100°C

The output would then span 4 to 20 mA for a temperature swing of 0°C to 100°C.

Note that the span can reversed, in that 4 mA can be set to a high process
value, and 20 mA can be set to a low process value, effectively reversing the
control direction.

If you wish to change the setting,
press the key once which will move the cursor
to the first character of the value to be changed

The TUNE function allows the user to
precisely adjust the 4-20mA output to
compensate for any errors in the output
circuitry. Normally, fine tuning the 4-
20mA output is not necessary.

The make the adjustment, place an
accurate current meter in series with the
4-20 mA output, with the appropriate
loads connected. When the TUNE
menu is selected, the controller puts
20mA out to the terminals. Use the
or keys to adjust the 20mA output
to get exactly 20.

The TUNE value can be adjusted over
the range from 0 to 1000, these are
unitless numbers used for tuning
purposes only.

Not stored

With "N" selected, pressing the
key will NOT store the selection, but
simply return to the OUTPUTS Menu.
This function is useful if you wish to
view the current selection without
making any changes.

Press the key to accept the
setting and move to the next
setting

The 4mA, 20mA and TUNE functions are
set up the same way as 4 - 20 mA CH 1
output.

Use the and
keys to change the setting

Press the key once
which will move the cursor
back to the RH side of the
display.

RUN MODE

The Controller has 2 4-20mA outputs, electrically isolated from
each other and ground. Either output can source current into a
maximum of 800 ohms.
Channel 2 can be selected to track the process or
temperature.
Channel 2 has fully independent and fully adjustable 4 & 20
mA output adjustments. This will enable the operator to span
the output over the desired range.

Note that if the T COMP OVERRIDE is ON and Channel
2 output is set to track temperature, the output will not
change, but hold at a value representing the temperature
set in the T COMP OVERRIDE.

STORE? Y N

4-20mA CH2 TEMP

STORE? Y N

20MA TUNE 512 >

4-20 CH2 TEMP

4-20mA CH2 TEMP

20MA OUT 100.0 >

4MA OUT 0.0 >

4-20 CH2 TEMP

4-20mA CH2

TEMPERATURE >

4-20mA CH2

P ROCESS >

T EMPERATURE >

TEMPERATURE >

4-20mA CH2

T EMPERATURE >

CALIBRATION

OUTPUTS

DIAGNOSTICS

UTILITIES

SETUP

4-20mA CH1

ALARM RELAY

RELAY A

RELAY B

7.15pH 25.0C