Monarch 309 instruction manual Operating Instructions

MODEL 309 FOUR CHANNEL DATALOGGING THERMOMETER

4.0Operating Instructions:

4.1Preparation for Measurement

Plug as many thermocouples as are to be monitored into the sockets marked T1 through T4, taking care to observe the polarity of the thermocouple pins. If a differential measurement is required, this is available only between T1 and T2, which determines which thermocouples should be connected to these locations.

4.2Power and Backlight

The button turns both the thermometer and the display backlight ON or OFF. Press it once to turn the thermometer ON. Every subsequent momentary press toggles the backlight ON or OFF. Press and hold this button for 3 seconds to turn the power OFF.

When first powered on, the display will show how much memory space is available for use, as shown to the right.

4.3Selecting the Temperature Scale

When first turned on, the instrument defaults to reading in Celsius (°C). The instrument toggles between Celsius (°C) and Fahrenheit (°F) each time the °C/°F button is pressed. The instrument remembers the scale setting when last turned off and powers on in that setting the next time.

4.4Data-Hold Operation

The present reading is held on the display by pressing the HOLD button. Pressing the HOLD button again releases the hold function and returns the instrument to continuous reading.

In the HOLD mode, the T1-T2, MAX MIN and °C/°F buttons are disabled, as indicated by two continuous beeps when pressed.

4.5T1-T2 Operation

When the T1-T2button is pressed, the display will indicate 1 – 2 indicating the instrument is in the differential mode of T1 minus T2. The display then indicates T1 value on the top left, T2 value on the bottom left, and the difference T1-T2on the bottom right.

4.6 Clock Setup

To set the real time clock:

1. Press and hold the T1-T2button and then power on the meter.

2.Press HOLD (clock).

3. Press REC (ν) or °C/°F (π) to increase or decrease the number; press HOLD to advance to the next item. The adjusting order is: year; month; day; hour; minute. Press HOLD again after the last setting to complete the process.

To abort during a setup process, press the button.

4.7 Recording Interval Setup

To set the recording interval:

1. Press and hold the T1-T2button and then power on the meter.

2.Press MAX MIN (interval).

3.Press REC (ν) or °C/°F (π) to increase or decrease the

number; press MAX MIN to advance to the next item. Press MAX MIN again after the last setting to complete the process. To abort during a setup process, press the button.

MODEL 309 FOUR CHANNEL DATALOGGING THERMOMETER

4.8Recording Data

Each momentary press of the REC button will alternately start and

stop recording. To clear the memory, power off the meter, press and hold the REC button followed by the button, holding both on simultaneously for at least 5 seconds. The display will show ‘CLR’ ‘SURE 5’, and releasing all buttons then clears the memory.

4.9MAX/MIN Operation

Press the MAX MIN button to enter the MAX/MIN mode. In this mode, both the maximum and minimum values are simultaneously retained in memory and updated with every new data sample. The instrument first enters the MAX mode, and the MAX symbol and value are both displayed. Pressing MAX MIN again advances the display to the MIN symbol and value. The next press of the MAX MIN button will cause both the MAX and MIN symbols to flash. This indicates that the maximum and minimum values have been updated in memory and the displayed reading is the present temperature. Each successive press of the MAX MIN button circulates the display mode among these options. To exit the MAX/MIN mode, press and hold the MAX MIN button for two seconds.

In the MAX/MIN mode, the °C/°F button is disabled, as indicated by two consecutive beeps if pressed.

4.10Auto Power Off

By default, the instrument powers on in the ‘Auto Power Off’ mode and will automatically shut off 30 minutes after the last key operation or RS232 communication.

To disable this feature, press and hold the HOLD button and then power on the meter.

Two successive beeps will indicate that ‘Auto Power Off’ is disabled, and the will not be displayed.

4.11Low Battery Condition

When the battery voltage is at or below the minimum for proper operation, the symbol will show on the display indicating that the battery must be replaced.

4.12Calibration

Calibration is conducted by adjusting the following potentiometers to within the tolerances shown.

(Ambient Temperature: 23 ± 3°C)

Input		Adjust VR	Tolerance	A simple single point calibration may be
0	°C	VR1	± 0.1 °C	performed by adjusting VR1 to 0 °C with
190	°C	VR2	± 0.1 °C	thermally stabilized ice water.
1000	°C	VR3	± 1 °C
1900 °F		VR4	± 1 °F	TX RX GND
4.13 Digital Output
The Digital Output is a 9600 bps N 81 serial interface.
RX is a 5V normally high input port.
TX is a	5V normally high output port.
Appendix: Thermocouple Probe Specifications
Model		Range	Tolerances	Description
TP-K01		-50°C to 200°C	±2.2°C or ±0.75%	Teflon insulation. Maximum insulation
Wire probe		-58°F to 392°F	±3.6°F or ±0.75%	temperature: 260°C (500°F)

TP-K01:

Probe for general condition measurements, especially for complex and hard to reach places.

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