Magnetrol THERMATEL TG1 Installation and operating manual - page 4
4
Pre-amplifier settings
Amplifier settings and LED indications
CALIBRATION
®
S1
S2
1
2
1
2
RTD CURRENT
SENSITIVITY
+
-
O
P
E
N
O
P
E
N
The units are factory set to the default sensitivity dip switch positions. These settings
should be valid for most liquid level, interface and flow cases. For gaseous flow appli-
cations or for specific liquid applications it may happen that the set point cannot be
established. Change the settings in these cases from higher sensitivity to highest sen-
sitivity depending what is needed to establish the setpoint. The settings on TMH sen-
sors should never be changed.
Alarm relay Potentiometer
Power LED:
Unit powered = green LED ON
Error LED:
OFF: unit operates normal
BLINKS: unit has registered an error
®
ALARM
DELAY
LOW
HIGH
FAIL-SAFE
+
–
+
–
mA
24 VDC
POWER
ERROR
+
–
SENSOR
Time Delay Potentiometer:
Before calibration, turn fully
counterclockwise until click
(max. 25 turns) = 0 s
mA signal:
The mA is a non linear signal of the actual process conditions;
- for flow: mA output increases as the flow rate increases
- for level: mA output increases when in a wet condition.
Error reporting is determined by setting of the Fail Safe mode;
- failsafe low
≤
3,6 mA
- failsafe high
≥
22 mA
The mA value depends upon sensor and application.
Fail-safe:
= Low level Fail-safe – the relay is ener-
gized when the flow is greater than the
alarm point or when the sensor is
immersed. The relay becomes de-ener-
gized when the flow is equal to or less
than the alarm set point or when the
sensor is dry (or in the low conductivity
media)
=High level Fail safe – the relay is ener-
gized when the flow is less than the
alarm point or when the level is lower
than the less than the switch point. The
relay will de-energize when the flow
reaches or exceeds the alarm point or if
the sensor becomes immersed (or in
the high conductivity media).
®
ALARM
DEL
AY
LOW
HIGH
FAI
L-SAFE
+
–
+
–
mA
24 VDC
POWER
ERROR
+
–
SENSOR
®
ALARM
DELAY
LOW
HIGH
FAIL-SAFE
+
–
+
–
mA
24 VDC
POWER
ERROR
+
–
SENSOR
LED indication:
TG1
green
LED ON = safe
(one or more of the 4 green LED's)
yellow
LED ON = reaching switch point
Red
LED ON = alarm
TG2
green
LED ON = safe
(one or more of the 4 green LED's)
yellow
LED ON = reaching switch point
No
LED ON = alarm
Open dipswitch
Closed dipswitch
DIP switch
positions
Default
sensitivity
Higher
sensitivity
Highest
sensitivity
Temperatures
≥
+100 °C (210 °F)
For TMH
sensors
RTD current (S1)
1
Closed
Closed
Open
Open
Closed
2
Open
Open
Closed
Closed
Open
Sensitivity (S2)
1
Open
Closed
Open
Open
Closed
2
Closed
Open
Closed
Closed
Open