RKI Instruments RP-6 User Manual

RP-6 Pump for the GX-94

Operator’s Manual

Part Number: 71-0076RK
Revision: 0
Released: 11/4/02

RKI Instruments, Inc. 33248 Central Ave. Union City, CA 94544

Phone: [phone] Fax: [phone]

Product W arranty

RKI Instruments, Inc., warrants gas alarm equipment sold by us
to be free from defects in materials, workmanship, and
performance for a period of one year from date of shipment
from RKI Instruments, Inc. Any parts found defective within
that period will be repaired or replaced, at our option, free of
charge. This warranty does not apply to those items which by
their nature are subject to deterioration or consumption in
normal service, and which must be cleaned, repaired, or
replaced on a routine basis. Examples of such items are:

a) Absorbent cartridges d) Batteries

b) Pump diaphragms and valves e) Filter elements

c) Fuses

Warranty is voided by abuse including mechanical damage,
alteration, rough handling, or repair procedures not in
accordance with the operator’s manual. This warranty indicates
the full extent of our liability, and we are not responsible for
removal or replacement costs, local repair costs, transportation
costs, or contingent expenses incurred without our prior
approval.

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER
WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED,
AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF
RKI INSTRUMENTS, INC., INCLUDING BUT NOT LIMITED TO, THE
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,
INC., BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF
ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR
OPERATE PROPERLY.

This warranty covers instruments and parts sold to users by
authorized distributors, dealers, and representatives as
appointed by RKI Instruments, Inc.

We do not assume indemnification for any accident or damage
caused by the operation of this gas monitor, and our warranty is
limited to the replacement of parts or our complete goods.

• 2 RP-6 Pump for the GX-94

Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Pump Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Coiled Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Sample Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Rubber Sample Nipple. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Optional Hose & Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Low Flow Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Replacing the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Replacing the Cotton Dust Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Replacing the Hydrophobic Disk Filter and Wire Mesh Disk . . . . . . 12

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

WARNING: Understand manual before operating and for proper

battery type. Substitution of components may impair
intrinsic safety. To prevent ignition of a hazardous
atmosphere, batteries must only be changed in an area
known to be nonhazardous. Not tested in oxygen
enriched atmospheres (above 21%).

RP-6 Pump for the GX-94 • 3

Overview

This manual describes the RP-6 Pump. This manual also
describes how to operate the RP-6 with the Model GX-94 and
maintain the RP-6. A parts list at the end of this manual lists
replacement parts and accessories for the RP-6.

Specifications

Table 1 lists specifications for the RP-6 Pump.

Table 1: Specifications

Power Supply 1 ea. AA size alkaline
Operating Time 5 hours minimum at 20°C
Operating

Temperature &
Humidity

Dimensions 33 (D) x 34 (W) x 134 (H) mm, tapered nozzle not

Weight Approximately 150 g (including alkaline battery)
Sample Flow Rate 0.5 LPM (liters per minute)
Alarm Indications Low Flow & Low Battery
Safety/Regulatory

-10°C to +40°C, 0 - 80% Relative Humidity (non­condensing)

included

C US

186718

CSA classified, “C/US”, as Intrinsically Safe. Exia.

Class I, Groups A, B, C, &D. Class I, Zone 0.

Temperature Code T4C.

RP-6 Pump for the GX-94 • 4

Description

The RP-6 Pump is a sample drawing accessory for the RKI
Instruments Inc. Model GX-94 Gas Monitor. It consists of the
pump unit, the GX-94 sample adapter, the coiled hose, and the
rubber sample nipple.

Coiled Hose

Exhaust Fitting

Power LED

Low Flow LED

Battery Cap

Thumbscrew

Sample Adapter

Filter Holder

Inlet Fitting
(GX-7 Type)

Pump Unit

Rubber Sample

Nipple

On/OffSwitch

Figure 1: RP-6 Pump Component Location

Pump Unit

The pump unit is housed in a red plastic case. A GX-7 type male
quick connect fitting is located on one end of the pump unit.
This is the inlet fitting to the pump unit. The GX-7 quick connect
is installed in a removable clear plastic filter holder. A cotton
dust filter is inside the filter holder. The filter holder may be

RP-6 Pump for the GX-94 • 5

removed by turning it counterclockwise and pulling it away
from the pump unit. Two flat membrane disk hydrophobic
filters and a wire mesh disk are located in the pump unit on the
filter holder end.

The battery compartment is located on the other end of the
pump unit. An AA alkaline battery is installed in the battery
compartment and held in place by a black plastic battery cap.
The battery cap may be removed for access to the battery by
pushing it down, turning it counterclockwise, and pulling it
away from the pump unit.

The exhaust fitting, a male quick connect, is located near the
battery cap end of the pump unit and is smaller than the inlet
fitting.

A rotating ON/OFF switch, a power indication LED, and a low
flow LED are located near the inlet end of the pump unit. The
power LED is on when the pump unit is on. The low flow LED
flashes when the pump is experiencing a low flow condition.

Inside the pump unit case are the circuit board and diaphragm
pump. There are no user serviceable components inside the
pump unit case except for the battery accessible through the
battery cap and the wire mesh and hydrophobic disk filters
accessible through the filter holder.

Coiled Hose

A 6 ft. coiled polyurethane hose is pr ovided with the RP-6. It has
a female quick connect fitting on each end. This hose connects to
the pump unit exhaust fitting on one end and to the sample
adapter on the other end.

Sample Adapter

The sample adapter is a red plastic cup which fits over the GX­94’s sensor diffusion screen and is held in place with a
thumbscrew. A male quick connect fitting is located on the
sample adapter which mates to the coiled hose.

RP-6 Pump for the GX-94 • 6

Rubber Sample Nipple

A cone shaped 4 inch long rubber sample nipple is included
with the RP-6 and is normally installed on the inlet fitting by
pushing the larger end over it. The smaller end can be inserted
in a hole or some other access to an enclosed area to sample the
environment.

Optional Hose & Probe

When desired, the rubber sample nipple may be removed and a
sample hose and probe with GX-7 fittings (optional accessories)
may be connected to the inlet fitting. Sample hose lengths are
available from 10 feet to 30 feet (see Parts List at the end of the
manual).

CAUTION: Sample hose lengths of more than 30 feet are not

recommended for the RP-6 because of flow rate reduction.

RP-6 Pump for the GX-94 • 7

Operation

Normal Operation

1. Start up the GX-94 and enter normal operation as described

2. Place the sample adapter onto the GX-94’s sensor diffusion

CAUTION: If the sample adapter is not held down firmly by the

in the GX-94 manual.

screen aligning the thumbscrew with the thr eaded hole in the
middle of the screen. Tighten the thumbscrew enough to
hold the sample adapter firmly on the GX-94.

thumbscrew, the unit will not respond to the target gases
properly.

3. Connect the coiled hose to the sample adapter and to the
exhaust fitting on the pump unit.

Figure 2: Connecting the RP-6 to the GX-94

RP-6 Pump for the GX-94 • 8

Optional Hose

Optional Probe

Figure 3: Connecting the Optional Hose & Probe

4. Attach the rubber sample nipple or an optional hose and
probe to the inlet fitting.

5. Attach the GX-94 to your belt or clothing using the belt clip.

6. Turn on the pump unit by turning the ON/OFF switch to the
ON position.

CAUTION: While the sample adapter is installed on the GX-94, the

pump unit must be on and connected to the sample
adapter for the GX-94 to function as a gas detection
monitor.

7. Go to the area to be sampled.
If the rubber sample nipple is used, use the pump unit to

sample the area of interest by holding it in the area. If
sampling from a vessel or an enclosed area is desired, insert
the rubber sample nipple into the vessel or enclosed area.

RP-6 Pump for the GX-94 • 9

Allow the pump unit to sample for 90 seconds for a full
response on the GX-94.

If an optional hose and probe are used instead of the rubber
sample nipple, hold the pump unit in one hand while
holding the probe in the area to be sampled. To sample from
a well or other similar sample area, the hose and probe may
be lowered into the sample area. Allow the pump unit to
sample for 90 seconds for a full response on the GX-94.

NOTE: Although the RP-6 pump does have a hydrophobic

filter built in, the optional probe does not have a
hydrophobic filter. It has a dust filter only.

8. Monitor the GX-94 display for the gas readings and take
appropriate action if gas alarms occur.

9. When sampling is complete, go to a fresh air area and turn of f
the pump unit.

10.Remove the sample adapter from the GX-94.

11.Remove the GX-94 from your belt or clothing.

12.Turn off the GX-94.

13.For convenience, you may leave the pump unit and the
sample adapter connected to the hose for storage of the RP-6.

Low Flow Alarm

When pump unit experiences a low flow condition, the Low
Flow LED starts flashing and the pump stops operating. Check
the rubber sample nipple and filters to make sure they are clear.
If a hose and probe are used, check them for kinks or
obstructions. To reset the low flow condition, turn the pump
unit off and restart it. If the low flow condition persists, the
pump may need servicing.

RP-6 Pump for the GX-94 • 10

Maintenance

Replacing The Battery

NOTE: To maintain the CSA classification of the RP-6, use

1. Locate the black plastic battery cap on one end of the pump
unit.

2. Push down and rotate battery cap counterclockwise until it
stops, 1/8 of a turn.

Eveready Energizer E91, Duracell MN1500, or Duracell
PC1500 alkaline AA batteries.

3. Pull the battery cap away from the pump unit.

4. Remove the old battery from the pump unit. It will slide right
out.

5. Insert the new battery + end first into the pump unit. Use an
AA alkaline. The battery orientation is shown on the pump
unit between the serial number label and the battery cap.

6. Slide the battery cap over the battery onto the pump unit,
push it down and turn it clockwise unit is stops.

Replacing the Cotton Dust Filter

1. Locate the clear plastic filter holder at one end of the pump
unit.

2. Grasp the two ridged sides of the filter holder and turn it
about 1/8 of a turn counterclockwise.

3. Pull the filter holder away from the pump unit.

4. Remove the old cotton dust filter from the filter holder and
replace it with a new cotton dust filter.

5. Reinstall the filter holder . Align the two tabs on the bottom of
the filter holder with the two slots in the pump unit. Push the
filter holder into the pump unit and turn it about 1/8 turn
clockwise until it snaps into place.

RP-6 Pump for the GX-94 • 11

Replacing the Hydrophobic Disk Filter
and Wire Mesh Disk

1. Locate the clear plastic filter holder at one end of the pump
unit.

2. Grasp the two ridged sides of the filter holder and turn it
about 1/8 of a turn counterclockwise.

3. Pull the filter holder away from the pump unit. Do not lose
the cotton dust filter.

4. The hydrophobic disk filters and wire mesh disk are located
in the pump unit and are retained by a rubber gasket. Pull
out the rubber gasket with needle nose pliers.

Hydrophobic Disk Filter

Cotton Dust Filter

Filter Holder

Rubber Gasket

Wire Mesh
Disk

Figure 4: Changing the Hydrophobic & Wire Mesh Filters

5. Remove the old hydrophobic filters and/or wire mesh disk
from the gasket. A hydrophobic filter is located on either side
of the wire mesh disk.

RP-6 Pump for the GX-94 • 12

6. Install the new hydrophobic filters and/or wire mesh disk
making sure a hydrophobic filter is located on each side of
the wire mesh disk.

7. Reinstall the gasket with the parts into the pump unit.

8. Reinstall the filter holder with the cotton dust filter. Align the
two tabs on the bottom of the filter holder with the two slots
in the pump unit. Push the filter holder into the pump unit
and turn it about 1/8 turn clockwise until it snaps into place.

RP-6 Pump for the GX-94 • 13

Parts List

Table 2 lists replacement parts and accessories for the RP-6 Pump.

Table 2: Parts List

Part Number Description

07-2005RK Gasket, filter/screen retaining
07-6001RK O-ring, for battery compartment
13-0112RK Wrist strap
17-1001RK Tapered rubber nozzle
21-1829RK Battery cap
21-1832RK Filter holder, clear plastic
33-0159RK Hydrophobic disk filter
33-1031RK Cotton ball 25 pack, for replacement of cotton

dust filter
33-1112RK Wire mesh disk filter
35-1513RK Sample adapter, rigid plastic
49-1120RK AA alkaline battery
80-0009RK-XX Sample hose (optional). Replace “XX” with

length in feet. Available lengths for the RP-6 are

10, 15, 20, 25, & 30 feet.
80-0021RK Coiled sample hose, RP-6 to GX-94 sample

adapter
80-0150RK Sample probe with dust filter (optional)

RP-6 Pump for the GX-94 • 14