Bacharach 2772-0803 manual 2.7. 0 - 1 VOLT CONVERSION, 1. 0 - 1 Volt Conversion 2.8 SYSTEM CHECK

REMOTE INTELLIGENT SENSOR - AREA MONITOR

2.6.3REACTIVE GASES. Many gases are extremely liable to attenuation and no extension of input tube should be attempted. These gases include ISOCYANATES, HYDRAZINES and ACID GASES such as HF and HCI.

2.6.4SYSTEM PERFORMANCE WITH EXTENDED SAMPLE LINES. Bacharach will not guarantee system performance and accuracy if extended sample lines are fitted, except where the company has expressly given written approval.

NOTE: Without such specific approval, the user must determine that performance is not adversely affected under the particular application conditions.

WARNING

Extended input lines should never be used when sampling low vapor pres- sure compounds such as MDI. These compounds are present in aerosol form, and sampling efficiency will be drastically reduced if the sample line is extended. Instruments intended for aerosol sampling have a dual input tube approximately 1" (25 mm) long protruding from the bottom of the instrument.

2.7.0 - 1 VOLT CONVERSION

2.7.1TOOLS & MATERIALS REQUIRED

•2.5 mm Hex Key

•Soldering Iron

•Solder

•Wire Cutter (Small)

•Buss Wire (#22 AWG, 1/2" Long)

2.7.2PROCEDURE. Remove main power from RIS System: then set ON/OFF switch SW1 to OFF. Follow the removal of the mechanical chassis from Section 4.11.2.

Remove link (0 Ohm resistor) from the 4 - 20 OUTPUT position using wire cutters to cut both ends of the link. Solder buss wire link into the 0-1 Volt position per Figure 2-1.

Reinstall the mechanical chassis, cables, and hoses using the first two paragraphs of Section

0-1V 4-20MA

J4

POWER

SW1

J3

ON

1

J2

1

1VR1

	J5								BATTERYPACK
						TR1
			C1 R1 R2IC1					R3 R4 R5R6 C3C4
	J1						C2
12VDC	-	1
INPUT	+	2	+
			C7		L1	R8 R9 R10			IC3
		3
	AOV	4	IC2						D1
ANALOG
OUTPUT			C5
	AOP		+
								C6
	AIN
NETWORK		VR2ZERO
COMMS	AOUT			R12		R7	R14	R15
INTERFACE	B				IC4

SR11

		PI		VR3SPAN		Q1
						GMD11760
SERIAL		PO		R13
PRINTER		PRDY
INTERFACE
		PPRS		13
		OV		14	0-1V	4-20MA
	+			15
RLA1	-	R16	RLA2	RLF		RLA1
	+
RLF
	-
RLA2	+				R17	R18

-

20

Figure 2-1. 0 - 1 Volt Conversion

2.8SYSTEM CHECK

NOTE: This procedure should be followed every time a new cassette is installed, to insure the system is operating correctly. During the initial system check of this unit, and at least on a yearly basis there after, the sample inlet tube should be checked for proper installation.

2.8.1TAPE CASSETTE LOADING

WARNING

This involves opening the RIS door, which automatically initiates the door-open alarm. Before opening the door to load or change a cassette, ensure that any external warning system is disabled or that those involved are aware of your intended actions.

Open the door with the key provided. Leave the system switch on. Press the TEST Mode switch on the bottom left inside corner of the door. Open the tape gate with the lever and remove the old cas- sette, if installed. The cassette and its mounting spigots are designed to fit tightly; use a firm and direct pull to disengage the cassette. See Figure 1-2 for the location of the items referred to.

NOTE: Make sure that the ‘O’ ring installed in the cassette molding, (and which seals purge connections), is not left behind when the cassette is removed.

Page 2-4 Instruction 2772-0803