DT722 User’s Manual
Michell Instruments
3
CALIBRATION
3
CALIBRATION AND ADJUSTMENT PROCEDURE
• Calibration
certifications
: In addition to the normal calibration
procedure, each transmitter can be supplied with its own traceable
calibration certificate. Please ask Michell Instruments or your local
distributor for more information.
•
Calibration interval time
: Under normal ambient conditions (0 to
50°C, 0 to 70% RH) and for accuracy of ±2% RH, an annual calibration
is recommended. For accuracy of ±5% RH a calibration is recommended
every five years. For environments with airborne chemicals or of high
humidity and high temperature conditions more frequent calibration is
recommended.
A humidity generator, (Michell Instruments S503, S904 or Optical), used in combination
with a general reference handheld hygrometer, is ideal for a quick and accurate
calibration. For more information on the S503, S904 or Optical humidity generators
please contact Michell Instruments (see www.michell.com for contact details).
3.1
Calibration and Adjustment
For recalibration and adjustment of the product please contact Michell
Instruments (see www.michell.com for contact details).
CONNECTIONS
CONNECTOR
CABLE
PIN 1
WHITE
YELLOW
BROWN
GREEN
PIN 2
PIN 3
PIN 4
PIN 5
8 TO 32 V DC
OUTPUT 2 = Temp 4-20 mA (max 500 Ω)
DO NOT CONNECT! (for calibration only)
OUTPUT 1 = RH 4-20 mA (max 500 Ω)
DO NOT CONNECT! (for calibration only)
V + 8 to 32 V DC
WHITE
GREEN
YELLOW
722
OUTPUT 1
RH
OUTPUT 2
Temp
Figure 3
Connections
