Veo Observer Plus Instruções de Operação descarregar pdf (Página 138)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Page 130 Operating Instructions

Important: When you connect the TTL inputs, ensure that the potential across

the pins is set to 5 V DC ±0.25 V. When you connect relays outputs,

the potential across the pins must be less than 30 V DC and the

current must be less than 0.5 A.

Important: Lors de la connexion des entrées TTL, assurez-vous que le potentiel

aux broches est défini à 5 V CC ±0,25 V. Lors de la connexion des

sorties, le potentiel aux broches doit être inférieure à 30 V CC et le

courant doit être inférieure à 0,5 A.

TTL Inputs

The inputs are TTL compatible and are assigned "Gas Off", "Autozero", "Start" and

"Divert". Use a true contact closure or relay output for the inputs on the Digital I/O

terminals. If a TTL level change is used, the voltage must be between 0 and 5 V, and the

polarity sense of the device must match that of the detector (i.e. the "+" and the "-" of the

external device must be connected to the "+" and the "-" of the detector, respectively). The

"+" port is the top one in each group and the "-" port is immediately below it, followed by

ground (GND).

• Start

The "Start" input is available for use with a chromatography data system that requires

triggering event synchronization for data collection from an external device, such as an

autosampler. The detector requires a contact closure or shorting of the terminals (a signal

of at least 0.5 seconds) from the external device.

• Gas Off

The "Gas Off" input can be used to turn off the internal gas inlet valve and stop the gas

supply to the nebulizer. It is recommended to use this input only when the gas supply is

limited.

If the" Gas Off" input is activated, the detector will shut down internal gas supply. This

will result in an alarm condition. Stop the alarm condition using the detector display or

the chromatography data system.

• Autozero

The "Autozero" input can be used to set the signal of a channel to a "zero point"

regardless of the current that is being measured.

Allow sufficient time after you performed the Autozero and before injection to ensure

that the autozero command is completed. Alternatively, an autozero may be performed

during a run. In this case, make sure that autozero occurs at a point in the chromatogram

where the response curve is expected to be reasonably flat (i.e., 15 seconds prior to the

elution of a peak).

• Divert

The "Divert" input can be used to control the stream-switching valve with a third-party

driver.

1 2 ... 133 134 135 136 137 138 139 140 141 142 143 144

Sem comentários

Veo Observer Plus Instruções de Operação Página 138