Specifications

MI 611-211 – October 2005 3. Operation

If you selected MANUAL and your transmitter was specified with digital communications

(870ITPH-F), and you had previously selected ANALOG under CONFIG OUTPUT, your display

will read MANUAL ANALOG.

1. Specify the value between 4.00 and 20.00 mA at which you want to hold the output

while in the Hold mode. The default value is 4.00.

2. Next, go to

MANUAL DIGITAL and specify the MEASUREment units,

TEMPerature, and ABSOLUTE value at which you want to hold the output while in

the Hold mode.

a. The TEMPerature can be specified between -99.9 and +999.9 (°C or °F). The

default value is 0.0.

b. The ABSOLUTE value can be specified between -2000.0 and +2000.0 mV. The

default value is 0.0.

If you selected MANUAL and your transmitter was specified with digital communications

(870ITPH-F), and you had previously selected DIGITAL under CONFIG OUTPUT, your display

will prompt you to specify the MEASUREment units, TEMPerature, and ABSOLUTE value at

which you want to hold the output while in the Hold mode.

1. The TEMPerature can be specified between -99.9 and +999.9 (°C or °F). The default

value is 0.0.

2. The ABSOLUTE value can be specified between -2000.0 and +2000.0 mV. The

default value is 0.0.

Calibration

(Refer to “Structure Diagram 9” on page 46 and “Structure Diagram 10” on page 47.)

Calibration routines in your transmitter were designed for simplicity and the elimination of user

errors. The procedures are self-prompting. Two routines are available if you are measuring pH. A

manual calibration enables you to enter or edit the value(s) of your solution. A single point or a

2-point manual calibration may be performed. However, a single point calibration may only be

used if you have previously done a 2-point calibration with your sensor. An automatic calibration

provides a buffer-recognition mechanism which locks in on the buffer value most closely

representing the combination of millivolts and temperature values being reported from the sensor.

Only manual calibration is available if you are measuring ORP or ISE. Only single point

calibration is available if you are measuring ORP. Note that damping is not performed during

either manual or automatic calibration.

NOTE

Before doing any calibration, check that the temperature on the secondary display

in the Measure mode agrees with the actual temperature of the solution. If there is a

difference, the actual temperature should be entered under

CAL TEMP in the

Calibration mode before beginning your calibration. The temperature may be

between -99.9 and + 999.9 (°C or °F).

While you are in the Calibration mode, two segments of the bar graph will appear under the

legend

CAL at the top of your front panel. These segments will flash if you are also in a Hold

mode. To enter the Calibration mode, press the

CAL key. You will be prompted to enter the

Minor passcode. If you enter the incorrect passcode, the transmitter will revert to the