Input/output signal connectors

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Article number: 208266

WARNING: To avoid electric shock, all electrical connections to the rear panel must be separated from hazardous voltages by double or reinforced insulation. Circuits of this type are classified as safety extra low voltage (SELV). Examples of circuits that are typically SELV include contact closure inputs and outputs for auto-samplers, and UV, RI, and fluorescence detector signal outputs for LC/MS systems. The electrical connections on the rear panel of this mass spectrometer are all SELV.

Note: To avoid damaging the instrument:

do not apply a voltage to the Analog (out) connectors; these are active connections driven by the instrument.
do not apply voltages higher than those shown in the tables.

Two removable connectors (designated External Connections 1 and External Connections 2) on the mass spectrometer’s rear panel hold the screw terminals for input/output signals. The connectors are keyed so that they can receive a signal cable inserted only one way.

Figure 1: Mass spectrometer electrical connections

External connections 1

External connections 2

Instrument LAN

Figure 2: Input/output signal connector configuration

Table 1: External connections 1

1	Event in 1+, digital signal, optimum +3.3 V, max +5 V	+5 V
2	Event in 1-, digital ground, 0V	0 V
3	Not used
4	Event in 2+, digital signal, optimum +3.3 V, max +5 V	+5 V
5	Event in 2-, digital ground, 0V	0 V
6	Not usedNot used
7	Not used
8	Not used
9	Not used
10	Not used

Table 2: External connections 2

1	Analog out +, instrument-driven electrical output	None
2	Analog out -, ground	None
3	Gas fail interlock, common	+30 V dc, 100 mA
4	Gas fail interlock, normally closed (N/C)	+30 V dc, 100 mA
5	Gas fail interlock normally open (N/O)	+30 V dc, 100 mA
6	Event out 1 +	+30 V dc, 100 mA
7	Event out 1 -	+30 V dc, 100 mA
8	Not used	+30 V dc, 100 mA
9	Event out 2 +	+30 V dc, 100 mA
10	Event out 2 -	+30 V dc, 100 mA

Signal connections

Table 3: Mass spectrometer signal connections

Signal connections	Description
Analogue out	Used for analog chart output functionality. The output voltage range is 0 to 2 V. The resolution of the voltage output is 12 bits.
Gas fail interlock out	Used to stop the solvent flow if the nitrogen gas supply fails. Maximum 30 V 0.5 A, 10 W.
Event out 1, event out 2	Allows the mass spectrometer to trigger an external event.
Event in 1, event in 2	Allows an external device to start data acquisition. Maximum 30 V.
CE interlock out	Interfaces with a capillary electrophoresis power supply so that the instrument is safely interlocked against high voltages.

Requirement: To meet the regulatory requirements of immunity from external electrical disturbances, install connection covers over the signal connectors.

To make signal connections:

Reference the signal connection location from the silk-screened label for inject start or any other input/output connection you plan to use from Connector I or II on the rear panel of each instrument.
To make the signal connections, attach the positive and negative leads of the signal cable to the connector.

Figure 3: Signal cables and connector

Slide the clamp (with the bend facing down) into the protective shield.Insert the clamp and shield (with the bend facing down) into the connection cover and loosely tighten with one self-tapping screw.
Insert the clamp and shield (with the bend facing down) into the connection cover and loosely tighten with one self-tapping screw.

Figure 4: Clamp, cover and shield

Insert the connector with the signal cable into the connection cover and position the clamp over the cable leads.
Tighten the clamp into place with the second self-tapping screw.

Figure 5: Cable leads in clamp

Place the second connection cover over the first cover and snap it into place.