MODEL 158A 909GF197B
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Section I – DESCRIPTION
1.1 GENERAL
The Robertshaw Model 158A Level-Tel is a
capacitance operated DC current transmitter with
noninteracting and independent zero and span
adjustments internally located. The transmitter is
remotely mounted from the probe with a triax
cable interconnected between the probe and the
transmitter.
1.2 MODEL IDENTIFICATION
Identify instrument models in accordance with the
descriptions and variations listed in each table.
158A - B 1 - A 1
Key Model No.
Table 1 – Output Current
Table 2 – Supply Voltage
Table 3 – Display Housing and Indication
Table 4 – Alarm Options
KEY MODEL NO.
Model
No.
Description
158A Capacitance-to-current transmitter
system for remotely mounted probe
assemblies. Control Unit is
available with or without indication
and optional alarms.
Table 1 – OUTPUT CURRENT
Desig. Description
A 1-5 mADC
B 4-20 mADC
C 10-50 mADC
D 0-10 mADC
Table 2 – SUPPLY VOLTAGE
Desig. Description
1
26.5 VDC, ± 10%
2
120 VAC, ± 10%, 50/60 Hz
3
240 VAC, ± 10%, 50/60 Hz
Table 3 – DISPLAY HOUSING AND
INDICATION
Desig. Description
A Water tight enclosure without
indicator.
Meets NEMA Type 4 and CSA
Enclosure 5.
B Water tight housing with indicator.
Meets NEMA Type 4 and CSA
Enclosure 5.
C Explosion proof housing without
indicator.
For Class I, Division 1, Groups C
and D; Class II, Division 1, Groups
E, F and G, areas.
D Explosion proof housing with
indicator.
For Class I, Division 1, Groups C
and D; Class II, Division 1, Groups
E, F and G, areas.
E Large weatherproof enclosure with
indicator to be used with optional
alarms.
Meets NEMA Type 12 & 13 and
CSA Encl 3.
Table 4 – ALARM OPTIONS
Desig. Description
1 None
2 ¾Alarm Relays for High or Low
Alarm.
3 ¾Alarm Relays for High and Low
Alarms.
¾ May only be used with Designation E on
Table 3.
