RKI Instruments GD-70D Quick Reference Manual

Perform all zeroing and calibrations on the GD-70D in a known fresh air area.
Note: The GD-70D gas transmitter is a generic transmitter that can take a variety
of different sensor units including electrochemical sensors (ESU), Pyrolysis-
particle type (SSU), Semiconductor type (SGU) and Galvanic cell type (OSU).
Consult the GD-70D manual for additional information.
1. Installing the sensor
a. Remove sensor from packaging leaving sensor unit intact. (do not open
up the sensor unit)
b. Push the two release tabs on the top of the main unit to open the front
cover.
c. Attach sensor to main unit by pushing it in locking the sensor in place.
d. Once sensor is secured, close the front cover pressing firmly until the
cover clicks into place.
2. Turning ON / OFF the GD-70D
a. Turn the GD-70D upside down so inlet and outlet fittings are facing up (if
possible). If not, then you will need to look at the bottom of the GD-70D.
b. Swing the white access door to the left to gain access to the POWER
switch.
c. "O" is OFF, "I" is ON.
d. Move the POWER switch to the desired position.
e. Swing the white access door back covering the POWER switch.
f. Allow the GD-70D to warm up sufficiently before use.
3. Changing Sensor Type
a. The GD-70D will automatically recognize the sensor unit when the sensor
is replaced or the specifications have changed. When a sensor with a
different serial number or with a different principle or specification is
attached, the GD-70D will display one of the following messages:
i. C-01 CHG UNIT: This message indicates that the sensor unit has
ii. C-02 CHG SPEC: This message is displayed if a sensor unit with a
Gas Detection For Life
Quick Reference Guide
Operation of the GD-70D
Rev. 5-17-11
been replaced with the same type (principle/type/range etc.). Press
and hold the MODE button to acknowledge the new sensor and
start up the unit.
different specification (principle/type/range etc.) is attached. Press
and hold the MODE button to acknowledge the new sensor unit
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