Operation continued, CResponse Test | Honeywell EC-P2 specs

2 Operation continued

CResponse Test

Prior to use, the unit should first be tested for proper response. With the detector operating, the unit should be exposed to a sample of the target gas. The display should show an increasing concentra- tion. If not, do not use it for field measurements.

DSample Inlet Port

The Manning EC-P2 is provided with a quick disconnect flexible extension wand. It will work with or without the wand. When using the extension wand, the internal walls must be kept dry. Water on the walls of the tubing can potentially absorb the target gas. To dry, allow the unit to pump dry, ambient air for 15 minutes.

EResponse/Recovery Time

Under normal conditions, the instrument will reach 90% of final value within two minutes. This is dependent on concentration and temperature.

Recovery time for the sensor depends on duration and concentration of exposure. Short exposures of concentrations at the lower end of the target gas range result in rapid recovery. Long exposures to levels above the middle of the target gas range or short exposures to levels exceeding the target gas range can extend recovery times to hours. Repeated exposures above the target gas range will reduce cell life and should be avoided.

FInterference Gases

The Manning EC-P2 is generally quite specific to the target gas, but depending on the target gas, other gases may cause a reading. See Appendix B for a listing of potential interference gases for the various SMART-CELLs.

GAlarm Functions

The Manning EC-P2 provides both visible and audible gas concentration alarms and system alarms. An alarm condition will be displayed on the normal operating screen as described on page 8.

In addition to the alarm indication code in the left side of the screen, an alarm message will flash inter- mittently on the screen, the audible beeper will sound and the ACK button will appear. Pushing the ACK button will silence the beeper and stop the display flashing. The Alarm Indication Code will remain on the left side of the screen until the alarm condition clears.

Alarm setpoints are stored on the individual SMART- CELL and can be changed by the user as described in Section 4.

NOTE: An audible alarm single beep every 60 seconds indicates that either the Alkaline

C cell battery is low or the internal rechargeable NiCad battery is low.

HDisplay Resolution

The Manning EC-P2 displays gas concentration with a resolution that depends upon the range of the unit. Full scale ranges of 0-4.00 or below will provide resolution of 0.01. Ranges from 0-5.0 up to 0-49.9 will provide resolution of 0.1. Full scale ranges above 50 will have a resolution of 1.

Figure 3: Manifold Assembly

	Outlet tube	Thumbscrews
	barb fitting	(loosen to remove
		manifold lid)
	TEST UNIT PRIOR TO USE	Sensor	Filter Material
	OUTLET	Sensor	Filter Material
Sampling		(SMART-CELL)
wand	INLET
	CAUTION
	DO NOT BLOCK INLET
Inlet fitting	OR OUTLIET PORTS
Inlet fitting
	Manifold lid	Sensor
		alignment
		groove
		Sensor
		alignment
		pin

Manning EC-P2, EC-P2 specifications

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