Dc -) – RKI Instruments 65-2461RK User Manual

Page 16

12 • 65-2461RK PPM Hexane Transmitter

amplifier to the junction box.

Remove the old amplifier.

Install the detector and controller terminals strips into their sockets on the new
amplifier as shown in Figure 3 on page 6 of this manual. If controller leads or detector
leads were removed during this procedure, refer to Tables 4 and 5 below.

Lay the new amplifier in the junction box. Do not re-install the amplifier in the
junction box with the screw, flat washer, and lock washer yet because you will need to
pull it out for access to the load voltage adjust pot below.

NOTE:

When a transmitter is first powered up with a new amplifier, the initial output
may be either high or below zero. Be sure to make arrangements so that this does
not cause unwanted alarms.

Turn on power to the controller.

10. Turn on the controller and place it into normal operation.

11. Allow the transmitter to run for 3 hours.

12. Make a preliminary setting of the sensor load voltage. See “Setting the Detector Load

Voltage” on page 13. This will be a temporary load voltage setting since the load
voltage will need to be set again after the burn-in period as described below.

13. Install the amplifier into the junction box with the screw, lock washer, and flat washer

you removed in Step 5 above. A foam gasket that orients the amplifier and keeps it
from rotating is installed on the bottom of the amplifier. Make sure the amplifier is
seated flat in the junction box.

14. Perform a preliminary calibration. See “Calibration” on page 15. This will be a

temporary calibration since the new ppm detector must burn-in before it can be
properly calibrated.

Table 4:Reconnecting the PPM Hexane Amplifier

to the Controller

Amplifier Controller

Terminal Strip

Controller

Transmitter Terminal

Strip (typical)

PWR/SIG “-”

- (DC -)

PWR/SIG “S”

S (4 - 20 mA In)

PWR/SIG “+”

+ 24V

Table 5:Reconnecting the PPM Hexane

Detector to the Amplifier

Amplifier Detector

Terminal Strip

Detector Lead

DETECTOR “R”

RED

DETECTOR “W”

WHT

DETECTOR “B”

BLK