Rotronic CF8-D Bedienungsanleitung

Dokument

UMA 148

Rev

Page

1 (5)

User manual

CF8-D/W-IN

General

The sensor CF8-D/W-IN is used to measure the carbon dioxide concentration inside incubators.

All functions can be modified from a PC with the communication cable.

Dokument

UMA 148

Rev

Page

2 (5)

Functional description

This part describes the function of the configuration of CF8-D/W-IN. Please note that the two outputs

may completely or partly have other functions. These functions may be reprogrammed after the

installation. To be sure that every unit is correctly programmed, in accordance to the actual

application, a check by a PC and the standard UIP software (version 4.0 or higher) is necessary.

OUT1 and OUT2 are used for the measuring signal of carbon dioxide concentration.

OUT1 = measuring signal of carbon dioxide concentration

OUT2 = measuring signal of carbon dioxide concentration

Terminal Standard configuration Standard settings *Standard function

OUT1 4-20mA 0-3 % CO2 Measuring signal

OUT2 0-5VDC 0-2 % CO2Measuring signal

Table I. Default configuration of CF8-D/W-IN

OUT1Current

Voltage

Connection in position “Current” provides 4-20mA

output range for OUT1. See note 1

Connection in position “Voltage” provides 2-10VDC

output range for OUT1. See note 1

OUT2Current

Voltage

Connection in position “Current” provides 0-10mA

output range for OUT2. See note 1

Connection in position “Voltage” provides 0-5VDC

output range for OUT2 See note 1.

Table II. Configuration jumpers for CF8-D/W-IN

Note 1:During start up the unit may deliver up to 10 VDC or 20 mA for up to half a second.

Dokument

UMA 148

Rev

Page

3 (5)

Functional test of CF8-D/W-IN

The unit has two LED’s -one yellow and one red. These LED’s indicate the status of the controller.

Yellow LED - ”Call for maintenance” is lit, if an error flag is set or the measurement is out of range.

The yellow LED flashes in series during Automatic Zero Point Calibration.

Red LED - ”Relay active” is lit for eight minutes when a zero point calibration has been executed.

PLEASE NOTE!

The sensor accuracy is defined at continuous operation.

Self diagnostics

The system contains complete self diagnostic procedures. A full system test is executed automatically

every time the power is turned on. For CF8-D/W-IN the internal voltage regulators and outputs are

checked. In addition, constantly during operation, the sensor probes are checked against failure by

checking the valid dynamic measurement ranges. These different system checks return error bytes to

the system RAM. If any error is detected, the yellow LED will be lit until the error has vanished and the

error flag is reset. “Warm up” and “Out of Range” are the only bits that are reset automatically after

return to normal state. All other error bits have to be reset manually after return to normal state by

power off and restart.

Descriptions of the different codes are listed below.

Bit #

Error

code

Error description

Suggested action

N/A

Fatal Error

Yellow LED continuously flashes.

Push buttons are not operating.

Try to restart sensor by power OFF/ON.

Contact local distributor

Reserved

Algorithm Error.

Indicate wrong EEPROM

configuration.

Try to restart sensor by power OFF/ON.

Check detailed settings and configuration

with UIP software version 4.0 and higher.

Contact local distributor

Output Error

Detected errors during output signals

calculation and generation.

Check connections and loads of outputs.

Check detailed status of outputs with UIP

software version 4.0 and higher.

Self Diagnostic Error.

May indicate the need of zero

calibration or sensor replacement.

Check detailed self diagnostic status with

UIP software version 4.0 and higher.

Contact local distributor

Out Of Range Error

Accompanies most of other errors.

Can also indicate overload or failures

of sensors and inputs.

Resets automatically after source of

error disappearance.

Try sensor in fresh air.

Check detailed status of measurements

with UIP software version 4.0 and higher.

See Note 1!

Memory Error

Non fatal error during memory

operations.

Check detailed settings and configuration

with UIP software version 4.0 and higher.

128

Warm Up state

Is always set after power up or power

failure. Resets after restart sequence.

If it doesn’t disappear in half a minute,

check power stability.

Note 1. Any probe is out of range. Occurs, for instance, during over exposure of CO2 sensor, in which

case the error code will automatically reset when the measurement values return to normal. Could

also indicate the need of zero point calibration.

Remark:If several errors are detected at the same time the different error code numbers will be

added together into one single error code!

Dokument

UMA 148

Rev

Page

4 (5)

Automatic Zero Point Calibration

The CF8-D/W-IN sensors have a function for easy automatic zero point calibration. The calibration

should be done after installation and at least once every year. The calibration can be done on site. It is

only necessary to connect the zero gas without any further action required from the operator, but to

check the verification signal offered from the system.

1. Unscrew one of the filters from the sensor housing and replace it with a hose nipple.

2. Connect the zero gas to the nipple. The sensor automatically enters phase 1 of the calibration

procedure when the CO2concentration drops sharply. See figure 2. Do not remove the zero gas

during calibration.

3. When the calibration starts the yellow LED starts to flash. The sensor continues the procedure

until the readings of the sensor are stable enough and are below the limit of Automatic Zero Point

Calibration. If the conditions are not good enough for calibration within eight minutes the sensor

returns to normal measuring operation without calibration.

4. When the calibration is successfully executed the yellow LED flashes four times, pauses and

flashes another four times for an eight minutes acknowledgement period, phase 2. During the

acknowledgement period the relay is closed and the red LED is lit.

5. Remove the zero gas during the acknowledgement period. The sensor returns to normal

measuring mode as soon as the calibration is ready. The yellow LED continues flashing, the red

LED is lit and the relay is closed independent of gas removal.

The zero gas can be generated by passing air through the chemical absorber in the service bag

F0005 or by using nitrogen in a gas bottle. Not more than three minutes shall pass before the yellow

LED starts to flash. If the yellow LED does not start to flash the zero gas is not good enough or the

sensor is not stable enough. Wait ten minutes before another attempt to calibrate the sensor.

If the sensor does not enter phase 1 even if the conditions are good push the push button on the PCB

until the red LED is lit to force a manual zero point calibration. Push the push button for at least ten

seconds.

Dokument

UMA 148

Rev

Page

5 (5）

Figure 2. An example of Automatic Zero Point Calibration

The Automatic Zero Point Calibration should be executed after installation and at least once a

year.

Trouble shooting

The yellow LED does not start to flash. The sensor does not enter calibration mode within three

minutes.

1. The absorber of the zero gas bag is not fresh. Remove the old absorber and refill the bottle with

fresh. The absorber is corrosive! Be careful and wear eye protection goggles.

2. The flow of the zero gas is too small or air is leaking into the sensor. The gas flow must be about

0,5 l/min.

3. Push the push button on the PCB for ten seconds (until the red LED is lit) to force manual zero

point calibration. Please check the gas before pushing the push button since the calibration is

executed even if the gas is not good enough.

Contact the dealer if the sensor still does not enter the calibration mode.

100

200

300

400

500

600

700

800

050 100 150 200 250 300 350

ppm CO2

Time seconds

Normal

measurement

Zero gas Yellow LED

flashes

Automatic Zero

Point Calibration

is reached

Phase 1 Check

calibration conditions Phase 2 Acknowledgement period

Calibration is executed The yellow

LED flashes four times The red LED

is lit The relay is closed

上海萨海测量技术有限公司

电话：021-6236 2960

传真：021-5235 2321

邮箱：[email protected]

网址：www.seasy-ist.com

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