Detcon FP-624C Manuel d'utilisateur télécharger pdf (Page 13)

3.6.1 Remote Mount Bridge Voltage Setup

If the sensor has been installed using the remote mounting configuration as described in section 3.5.6, the sensor

bridge voltage must be adjusted after initial power up. If this is not the case skip this section and proceed to Initial

Operational Tests. Otherwise follow the steps below to set the sensor bridge voltage.

Material Requirements

* Detcon PN 3270 MicroSafe™ Programming Magnet

* Digital volt/ohm meter.

3.6.2 Programming Magnet Operating Instructions

Operator interface to MicroSafe™ gas detection products is via magnetic switches located behind the transmitter

face plate. DO NOT remove the glass lens cover to calibrate or change programming parameters. Two switches

labeled “PGM 1” and “PGM 2” allow for complete calibration and alarm level programming without removing the

enclosure cover, thereby eliminating the need for area de-classification or the use of hot permits.

A magnetic programming tool (see figure 6) is used to operate the switches. Switch action is defined as momentary

contact, 3 second hold, and 30 second hold. In momentary contact use, the programming magnet is waved over a

switch location. In 3 second hold, the programming magnet is held in place over a switch location for 3 or more

seconds. In 30 second hold, the programming magnet is held in place over a switch location for 30 or more sec-

onds. Three and thirty second hold is used to enter or exit calibration and program menus while momentary con-

tact is used to make adjustments. The location of “PGM 1” and “PGM 2” are shown in figure 7.

NOTE: If, after entering the calibration or program menus, there is no interaction with the menu items for more

than 30 seconds, the sensor will return to its normal operating condition.

3.6.1 Continued - Set Sensor Bridge Voltage Procedure

a) Declassify the area around the sensor.

b) Remove the junction box cover from the remote sensor enclosure (see figure 5A).

c) Using the digital volt/ohm meter, measure the bridge voltage at the remote sensor connector board from the

“White” terminal to the “Blue” terminal as shown in figure 5A. Target voltage is 2.7 ±0.2 volts.

d) At the transmitter, enter the programming menu by holding the programming magnet stationary over “PGM 2”

for 30 seconds until the display reads “VIEW PROG STATUS”, then withdraw the magnet.

e) Next, scroll to the “SET BRIDGE VOLTS” listing and then hold the programming magnet over “PGM 1”

for 3 seconds. The menu item appears as “BRIDGE VOLTS U/D”.

f) Use the programming magnet to make an adjustment to “PGM 1” to increase or “PGM 2” to decrease the

bridge voltage.

g) Exit to the programming menu by holding the programming magnet over “PGM1” for 3 seconds, or automati-

cally return to the programming menu in 30 seconds.

Model FP-624C Combustible Gas Sensor PG.13

Magnetic Programming Tool

Figure #6

detcon inc.

Program Switch #2

FLT

ALM

CAL

MicroSafe™ LEL Gas Sensor

HO USTON, TE XAS

PGM 2

PGM 1

ALM

MODEL FP-624C

CONTRAST

Alarm & Cal LEDs

Program Switch #1

Menu Driven Display

Plug-in Microprocessor Control Circuit

Display Contrast Adjust

Figure #7

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 25 26

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Detcon FP-624C Manuel d'utilisateur Page 13

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