DIMENSIONS—
See Figure 1.
SHIPPING WEIGHT (approximate)—
2.0 pounds (0.9 kilogram).
K SERIES TRANSMITTER
INPUT VOLTAGE—
24 vdc (10 to 28 vdc range).
POWER CONSUMPTION—
1.5 watts with sensor.
OUTPUT CURRENT—
Linear 4 to 20 ma.
ZERO SHIFT WITH TEMPERATURE—
0.02% LFL/°C at maximum gain.
GAIN SHIFT WITH TEMPERATURE—
0.01% LFL/°C at maximum gain.
TEMPERATURE RANGE—
Operating:
0°F to +167°F (–40°C to +75°C).
Storage:
–49°F to +185°F (–45°C to +85°C).
SENSOR
RESPONSE TIME (with full scale gas applied)—
10 seconds to reach 50 percent of value of applied
gas, and 30 seconds to reach 90 percent of value of
applied gas.
ACCURACY—
±3 percent full scale up to 2.5 percent methane gas
by volume in air (50% LFL), ±5 percent full scale up
to 5 percent methane gas by volume in air (100%
LFL).
REPEATABILITY—
±5 percent, full scale.
ZERO DRIFT—
Less than 1% LFL per month.
OXYGEN EFFECTS—
The sensor will operate normally with the oxygen level
in the atmosphere at or above 10 percent concentra-
tion. Under oxygen enriched conditions the sensor
will respond normally, but the user should beware of
an increase in the explosive hazard. Contact the fac-
tory for information regarding use of the sensor in oxy-
gen deficient atmospheres.
HUMIDITY RANGE—
0 to 99% RH, non-condensing.
HUMIDITY EFFECT—
Less than ±5 percent full scale deviation at 10% to
90% RH.
SYSTEM APPROVAL—
The R8471A Combustible Gas Controller, base and
premium model in 3U and 4U height, has been tested
and approved by FMRC. It can be used with any
FMRC approved gas sensing device capable of gen-
erating a 4 to 20 ma input.
FMRC approval of the R8471A Combustible Gas
Controller, however, does not include or imply
approval of input devices such as sensors or trans-
mitters, or devices connected to the controller out-
puts. To maintain FMRC system approval,
all equip-
ment
connected to the controller must be FMRC
approved. Note that while the Det-Tronics com-
bustible gas sensor and K Series transmitter are fully
compatible with the R8471A Controller, they have not
been FMRC tested and approved for use with the
R8471A Controller.
2
Figure 1—Controller Dimensions in Inches (Centimeters)
Table 1—Selectable Relay Options
Relay
Selectable
Selectable
Selectable
Normally
Normally
Latch/
Open/Closed
Energized/
Non-Latch
De-Energized
Low
Y
Y
Y
High
Y
Y
N
1
Auxiliary
Y
Y
Y
Fault
Y
N
2
N
3
Y = Yes
N = No
1Latching only
2Normally energized
3No latching option
➛
➛
9.3 (23.6)
1.0
(2.5)
7.0
*
(17.8)
➛
➛
➛
➛
A1526
*
4U DIMENSIONS SHOWN, 3U HEIGHT IS 5.2 (13.3)
