Model GD-K8A4X
Supplement to the GD-K8A
Operator’s Manual
Part Number: 71-0091RK
Revision: A
Released: 5/17/11
www.rkiinstruments.com
WARNING
Read and understand this instruction manual before operating
instrument. Improper use of the gas monitor could result in
bodily harm or death.
Periodic calibration and maintenance of the gas monitor is
essential for proper operation and correct readings. Please
calibrate and maintain th is instrument regularly! Frequency of
calibration depends upon the type of use you have and the sensor
types. Typical calibration frequencies for most applications are
between 3 and 6 months, but can be required more often or less
often based on your usage.
Model GD-K8A4X Sample Draw Trans mitter
Product Warranty
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 the 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. Parts must be returned to RKI
Instruments, Inc. for repair or replacement. 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) Pump diaphragms and valves c) Batteries
b) Fuses d) Filter elements
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or
repair procedures not in accordance with instruction 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 only 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. Warranty covers parts and labor performed at RKI Instruments, Inc. only, and does
not cover field labor or shipment of parts back to RKI.
Model GD-K8A4X Sample Draw Transmi tter
Overview
This supplement describes the differences and additional features of the Model
GD-K8A4X compared to the GD-K8A. It also describes how to install, startup, maintain,
and calibrate the GD-K8A4X.
Specifications
Table 1 lists specifications for the GD-K8A4X.
Table 1: Specifications
Target Gas & Detector Range Refer to the RKI Instruments Inc. List of Detectable Gasses
Enclosure Type NEMA 4X
Sampling Method Diffusion
Input Power 24 VDC
Signal Output 4 to 20 mA
Response Time 90% in 60 seconds
Accuracy See GD-K8A manual
WARNING: When using the GD-K8A4X, you must follow the instructions and
warnings in this manual to assure proper and safe opera tion of the
GD-K8A4X and to minimize the ri sk of personal injury. Be sure to
maintain and periodically calibrate the GD-K8A4X as described in this
manual.
1 • Model GD-K8A4X Sample D raw Transmitter
Description
This section describes the components of the GD-K8A4X. It consists of the enclosure, the
sensor and amplifier from a GD-K8A, and a wiring terminal strip.
Sensor
3/4" Conduit Hub
+24 VDC
Feedback (-)
Note: Shown Without Door
Sensor Keeper
Span Pot
Zero Pot
GainPot(Factory Adjust)
Factory Adjust
TP1 (+)
TP2 (-)
Factory
Use Only
Wiring Terminal
Strip
(mA Output)
Figure 1: Component Location/Wiring
Enclosure
The enclosure is a type NEMA 4X plastic enclosure designed for use in areas that are
subject to rain or hosing down. A mounting foot is installed in each corner. A hole in the
front door allows the sensor to sample the ambient air by diffusion. A rain shield installed
over the hole protects the sensor from water. A 3/4” conduit hub is located on the bottom
of the enclosure for wire entry.
Sensor/Amplifier
The sensor/amplifier from a GD-K8A is mounted to a sensor plate. The sensor plate is
mounted to a mounting plate with four standoffs. See the GD-K8A Operator’s Manual for
a complete description of the sensor and amplifier.
Wiring Terminal Strip
A three point terminal strip is located near the bottom of the enclosure on the mounting
plate for connections to the controller.
Model GD-K8A4X Sample Draw Transmitter • 2
Installation
This section describes how to install the GD-K8A4 X a t the monitoring site.
Mounting the GD-K8A4X
7.2
.30 X .50 SLOTS 4X
6.94
1.7
4.00
SENSOR
OPENING
6.5
5.6
1.65
4.18
3/4 CONDUIT HUB
DOOR LAT CHE S
4.4
Figure 2: Outline & Mounting Dimensions/Component Location
1. Select a mounting site that is representative of the monitoring environment. Consider
the following when you select the mounting site.
• Select a site that is easily accessible for servicing.
• Select a site where the GD-K8A4X is not likely to be bumped or disturbed. Make
sure there is sufficient room to make wiring connections at the bottom of the GDK8A4X. Also make sur e t her e is s uf fi cient room to perform start-up, maintenance,
and calibration procedures.
• Use four 1/4” screws through the mounting feet to mount the GD-K8A4X to a
vertical surface. See Figure 2 for the mounting dimensions.
3 • Model GD-K8A4X Sample D raw Transmitter
Wiring the GD-K8A4X to a Controller
WARNING: Always verif y that power to the GD-K8A4X and to the controller are off
and that the controller’s power switch is in the off position before making
wiring connections or adjustments.
1. Turn off power to the controller.
2. Place the controller’s power switch in the OFF position.
3. Use the conduit hub at the bottom of the GD-K8A4X for routing shielded cable into
the enclosure. See Figure 1 for the wiring connections.
4. Connect the cable shield’s drain wire to a chassis ground at the controller, but do not
connect it at the GD-K8A4X.
CAUTION: Leave the cable shield’s drain wire insulated and disconnected at the GD-K8A4X.
You will connect the opposite end of the cable shield’s drain wire at the controller.
CAUTION: At the controller, do not route power and GD-K8A4 X wiring through the same
conduit hub. The power cable may disrupt the transmission of the GD-K8A4X’s
signal to the controller.
Start Up
See the GD-K8A Operator’s Manual for GD-K8A startup instructions.
Operation
See the GD-K8A Operator’s Manual for an operational description of the GD-K8A
sensor/amplifier that is mounted inside the enclosure.
Maintenance/Calibration
See the GD-K8A Operator’s Manual for maintenance and calibration instructions. Open
the enclosure door to gain access to the sensor for calibration.
Parts List
Table 2 lists replacement parts and accessories for the GD-K8A4X. See the GD-K8A
Operator’s manual for other spare parts.
Part Number Description
Table 2: Parts List
18-0107RK 3/4” conduit hub
Model GD-K8A4X Sample Draw Transmitter • 4
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