DDS EX
Explosion-Proof Transmitter and Controller Instruction Manual
9
Tightening
Torque
Screw terminal connectors: 5 lb-in (0.56
Nm)
Overall
Dimensions
6.42" x 7.97" x 8.47" (W x H x D)
(163 mm x 202 mm x 215 mm)
Approximate
Shipping
Weight
16.0 lbs (7.26 kg)
Warranty
3 years parts and labor
Relays
Rating
4 SPDT (Form C) internal and/or 4 SPST
(Form A) external; rated 3 A @ 30 VDC
and 125/250 VAC resistive load; 1/14 HP
(
≈
50 W) @ 125/250 VAC for inductive
loads
Noise
Suppression
Noise suppression is recommended for
each relay contact switching inductive
loads.
Electrical
Noise
Suppression
A suppressor (snubber) should be
connected to each relay contact switching
inductive loads to prevent disruption to the
microprocessor’s operation.
Recommended suppressor value:
0.01 µF/470
Ω
, 250 VAC (PDX6901).
Deadband
0-100% of span, user programmable
High or Low
Alarm
User may program any alarm for high or
low trip point.
Unused alarm LEDs and relays may be
disabled (turn off).
Relay
Operation
Automatic (non-latching)
Latching (requires manual acknowledge)
Sampling (based on time)
Pump alternation control (2 to 4 relays)
Off (disable unused relays and enable
Interlock feature)
Manual on/off control mode
Relay Reset
User selectable via front panel buttons,
digital inputs, or PC
1. Automatic reset only (non-latching),
when the input passes the reset point.
2. Aut manual reset at any time
(non-latching)
3. Manual reset only, at any time
(latching)
4. Manual reset only after alarm condition
has cleared (L)
Note: Front panel button or digital input
may be assigned to acknowledge
relays programmed for manual reset.
Time Delay
0 to 999.9 seconds, on & off relay time
delays
Programmable and independent for each
relay
Fail-Safe
Operation
Programmable and independent for each
relay.
Note: Relay coil is energized in non-alarm
condition. In case of power failure,
relay will go to alarm state.
Auto
Initialization
When power is applied to the scanner,
relays will reflect the state of the input to
the scanner.
Isolated 4-20 mA Transmitter Output
Output Source
PV1-16, math channels C1-4, set points 1-
4, or manual control mode
Scaling Range
1.000 to 23.000 mA for any display range
Calibration
Factory calibrated: 4.000 to 20.000 = 4-20
mA output
Analog Out
Programming
23.000 mA maximum for all parameters:
Overrange, underrange, max, min, and
break
Communication
Break
Programmable mA output when a slave
device does not reply within the response
timeout.
Accuracy
± 0.1% of span ± 0.004 mA
Temperature
Drift
0.4 µA/
°
C max from 0 to 65
°
C ambient, 0.8
µA/
°
C max from -40 to 0
°
C ambient.
Note: Analog output drift is separate from
input drift.
Isolated
Transmitter
Power Supply
Terminals I+ & R: 24 VDC
±
10%. May be
used to power the 4-20 mA output or other
devices. Refer to Figure 3 on page 16 and
All models @ 25 mA max.
External Loop
Power Supply
35 VDC maximum
Output Loop
Resistance
Power supply
Minimum Maximum
24 VDC
10
Ω
700
Ω
35 VDC (external) 100
Ω
1200
Ω
Digital Inputs & Outputs
Channels
4 digital inputs & 4 digital outputs
Digital Input
Logic High
3 to 5 VDC
Digital Input
Logic Low
0 to 1.25 VDC
Digital Output
Logic High
3.1 to 3.3 VDC
Digital Output
Logic Low
0 to 0.4 VDC
Source
Current
10 mA maximum output current
Sink
Current
1.5 mA minimum input current
+5 V
Terminal
To be used as pull-up for digital inputs
only.
Connect normally open pushbuttons across
+5 V & DI 1-4.
WARNING
DO NOT use +5 V
terminal (pin 1) to power
external devices.
Function
Assignment
The on-board digital inputs (1-4) are
designed to mimic the behavior of the front
panel buttons (Menu, F1, F2, & F3).
If you wish to change their behavior, re-
assign F1-F3 to the desired function, then
change the corresponding digital input to
match.
